Tripath Technology, Inc. - Technical Information
BRIDGED RB-TA3020-1, BRIDGED RB-TA3020-2, BRIDGED RB-TA3020-3
CLASS-T DIGITAL AUDIO AMPLIFIER EVALUATION BOARD
USING DIGITAL POWER PROCESSING (DPPTM) TECHNOLOGY
Technical Information-Preliminary Revision 1.0 - June 2001
GENERAL DESCRIPTION
The Bridged RB-TA3020 evaluation board is based on the TA3020 digital audio power amplifier from
Tripath Technology. This board is designed to provide a simple and straightforward environment for
the evaluation of the Tripath TA3020 amplifier in bridged mode. This board is implemented in a
bridged configuration for high power mono output.
Note: There are three versions of the Bridged RB-TA3020, depending on nominal supply
voltage and desired output power.
Bridged RB-TA3020-1 – Nominal supply voltage +/-23V to +/-36V
Bridged RB-TA3020-2 – Nominal supply voltage +/-30V to +/-48V
Bridged RB-TA3020-3 – Nominal supply voltage +/-40V to +/-64V
FEATURES
Bridged RB-TA3020-1: 300W continuous
output power @ 0.1% THD+N, 4Ω, +30V
Bridged RB-TA3020-2: 600W continuous
output power @ 0.1% THD+N, 4Ω, +43V
Bridged RB-TA3020-3: 1200W continuous
output power @ 0.1% THD+N, 4Ω, +60V
Outputs short circuit protected
BENEFITS
Quick, easy evaluation and testing of the
TA3020 amplifier in bridged mode
Uses only N-channel power MOSFETs
Ready to use in many applications:
o Car Audio Amplifier
o Powered Subwoofers
o High Power Mono Amplifier
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
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Tripath Technology, Inc. - Technical Information
OPERATING INSTRUCTIONS
Power Supply Description
There are four external power supplies required to operate this board: VPP, VNN, VN10, and V5
(see Figures 1 and 2). VPP and VNN power the load and so must each be able to provide half of
the desired output power, plus about 20% for overhead and margin. The TA3020 amplifier also
requires a supply, VN10, that is 10V more positive than VNN and tracks VNN.
Though not required, the following powering-up sequence is usually adhered to during bench
evaluations: 1st) V5 and VN10, 2nd) VNN and 3rd) VPP (refer to the Turn-on/off Pop section). The
positive and negative supply voltages do not have to match or track each other, but distortion or
clipping levels will be determined by the lowest (absolute) supply voltage. Figure 1 shows the
proper supply configuration for the EB-TA3020.
VPP (yellow)
VN10 (green)
VNN (orange)
V5 (red)
PGND (blue)
VS
VS
5V
10V
AGND (black)
Note: To avoid signal degradation, the Analog Ground and Power Ground should be kept
separate at the power supply. They are connected locally on the Bridged RB-TA3020-X. The two VPP
yellow wires should be tied together and the two VNN orange wires should also be tied together.
Connector Power Supply
J2 (Yellow) VPP
J2 (Blue) PGND
J2 (Orange) VNN
J2 (Orange) VNN
J2 (Green) VN10
J2 (Yellow) VPP
J1 (Red) V5
J1 (Black) AGND
Table 1
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
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Tripath Technology, Inc. - Technical Information
Input Connections
Audio input to the board is located at INPUT (J200) (see Figures 2 and 3). The input can be a test
signal or music source. An RCA cable is provided with a female 100mil connector to mate with J200.
Output Connections
There are two output connectors on the reference board for the speaker output. The positive
output is connected to J101 with a red wire attached. The negative output is connected to J202
with a black wire attached. The negative output is not a ground, but an output signal with equal
amplitude and opposite phase compared to the positive output. Outputs can be any passive
speaker(s) or test measurement equipment with resistive load (see Application Note 4 for more
information on bench testing).
Turn-on/off Pop
To avoid turn-on pops, bring the mute from a high to a low state after all power supplies have
settled. To avoid turn-off pops, bring the mute from a low to a high state before turning off the
supplies. The only issue with bringing up the V5 last, or turning it off first, is clicks/pops. If the
mute line is properly toggled (slow turn-on, quick turn-off), then any power up sequence is
acceptable. In practice, the V5 will usually collapse before VPP and VNN. The same holds true
for the VN10 supply. It can collapse before VPP or VNN though this may cause a larger turn-off
pop than if the mute had been activated before either the VN10 or V5 supply have collapsed. No
damage will occur to the TA3020 if either the V5 or VN10 collapse before VPP or VNN.
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
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Tripath Technology, Inc. - Technical Information
EB-TA3020 BOARD
Output
Transistors
Offset
Adjustment
V5 (red)
AGND (blk)
Input
Connector
Break Before Make
Jumpers
Mute
Jumper
Output
Transistors
Negative
Output (blk)
Positive
Output (red)
Power In
VPP (yel)
PGND (blu)
VNN (org)
VNN (org)
VN10 (grn)
VPP(yel)
Figure 2
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
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Tripath Technology, Inc. - Technical Information
Positive OutputNegative Output
Offset
Adjust
V5
AGND
AGND
Input
Tripath
TA3020
BBM1
BBM0
MUTE
VPP
VPP
VNN
VNN
VN10
PGND
M203
M201
M200
M202
M103
M101
M100
M102
C209 C109
L200 L100
C113C111C211C213
+
-
+
-+
-
10V
+
-
5V
Audio Source
VPPVNN
Figure 3
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
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Tripath Technology, Inc. - Technical Information
ELECTRICAL CHARACTERISTICS FOR BRIDGED RB-TA3020-1
Unless otherwise specified, f = 1kHz, Measurement Bandwidth = 22kHz, RL = 4Ω, TA = 25 °C.
All of the measurements are typical value.
SYMBOL PARAMETER CONDITIONS VALUE
PO Output Power
(Continuous Average/bridged load)
Bridged RB-TA3020-1
+/-30V power supplies
THD+N = 0.1% RL = 4Ω
R
L = 2Ω
THD+N = 10% RL = 4Ω
R
L = 2Ω
350W
600W
500W
850W
+Freqsw Switching Frequency of the Positive
Output
VIN = 0 V 650kHz
-Freqsw Switching Frequency of the Negative
Output
VIN = 0 V 620kHz
VN10Iq Quiescent Current of VN10 supply VIN = 0 V 180mA
V5Iq Quiescent Current of V5 supply VIN = 0 V 45mA
VPPIq Quiescent Current of VPP supply VIN = 0 V 100mA
VNNIq Quiescent Current of VNN supply VIN = 0 V 100mA
η Power Efficiency +/- 30V, POUT = 500W, RL = 4Ω 89%
η Power Efficiency +/- 30V, POUT = 850W, RL = 2Ω 83%
eOUT Output Noise Voltage A-Weighted, input AC grounded 215uV
ELECTRICAL CHARACTERISTICS FOR BRIDGED RB-TA3020-2
Unless otherwise specified, f = 1kHz, Measurement Bandwidth = 22kHz, RL = 4Ω, TA = 25 °C.
All of the measurements are typical value.
SYMBOL PARAMETER CONDITIONS VALUE
PO Output Power
(Continuous Average/bridged load)
Bridged RB-TA3020-2
+/-43V power supplies
THD+N = 0.1% RL = 4Ω
R
L = 2Ω
THD+N = 10% RL = 4Ω
710W
950W
1000W
PO Output Power
(Continuous Average/bridged load)
Bridged RB-TA3020-2
+/-33V power supplies
THD+N = 0.1% RL = 2Ω
THD+N = 10% RL = 2Ω
650W
900W
+Freqsw Switching Frequency of the Positive Output VIN = 0 V 640kHz
-Freqsw Switching Frequency of the Negative
Output
VIN = 0 V 605kHz
VN10Iq Quiescent Current of VN10 supply VIN = 0 V 270mA
V5Iq Quiescent Current of V5 supply VIN = 0 V 45mA
VPPIq Quiescent Current of VPP supply VIN = 0 V VPP = +43V VNN = -43V 110mA
VNNIq Quiescent Current of VNN supply VIN = 0 V VPP = +43V VNN = -43V 110mA
η Power Efficiency +/- 43V, POUT = 1000W, RL = 4Ω 88%
η Power Efficiency +/- 33V, POUT = 900W, RL = 2Ω 83%
eOUT Output Noise Voltage A-Weighted, input AC grounded 300uV
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
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Tripath Technology, Inc. - Technical Information
ELECTRICAL CHARACTERISTICS FOR BRIDGED RB-TA3020-3
Unless otherwise specified, f = 1kHz, Measurement Bandwidth = 22kHz, RL = 4Ω, TA = 25 °C.
All of the measurements are typical value.
SYMBOL PARAMETER CONDITIONS VALUE
PO Output Power
(Continuous Average/bridged load)
Bridged RB-TA3020-3
+/-60V power supplies
THD+N = 0.1% RL = 4Ω
THD+N = 10% RL = 4Ω
1350W
1800W
PO Output Power
(Continuous Average/bridged load)
Bridged RB-TA3020-3
+/-43V power supplies
THD+N = 0.1% RL = 2Ω
THD+N = 10% RL = 2Ω
1350W
1500W
+Freqsw Switching Frequency of the Positive Output VIN = 0 V 630kHz
-Freqsw Switching Frequency of the Negative
Output
VIN = 0 V 600kHz
VN10Iq Quiescent Current of VN10 supply VIN = 0 V 290mA
V5Iq Quiescent Current of V5 supply VIN = 0 V 45mA
VPPIq Quiescent Current of VPP supply VIN = 0 V VPP = +60V VNN = -60V 130mA
VNNIq Quiescent Current of VNN supply VIN = 0 V VPP = +60V VNN = -60V 140mA
η Power Efficiency +/- 60V, POUT = 1800W, RL = 4Ω 87%
η Power Efficiency +/- 43V, POUT = 1200W, RL = 2Ω 84%
eOUT Output Noise Voltage A-Weighted, input AC grounded 400uV
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
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Tripath Technology, Inc. - Technical Information
TYPICAL PERFORMANCE FOR BRIDGED RB-TA3020-1
THD+N vs Output Power
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
THD+N (%)
11k2 5 10 20 50 100 200 500
Output Power (W)
f = 1kHz
BBM = 80nS
Vs = +/-30V
RLoad = 2Ω
BW = 22Hz - 22kHz
THD+N vs Output Power
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
THD+N (%)
1 5002 5 10 20 50 100 200
Output Power (W)
f = 1kHz
BBM = 80nS
Vs= +/- 30V
RLoad = 4Ω
BW = 22Hz - 22kHz
THD+N vs Frequency
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
THD+N (%)
20 20k50 100 200 500 1k 2k 5k 10k
Frequency (Hz)
BBM = 80nS
Vs= +/- 30V
Pout = 150W
RLoad = 4Ω
BW = 20Hz - 20kHz
THD+N vs Frequency
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
THD+N (%)
20 20k50 100 200 500 1k 2k 5k 10k
Frequency (Hz)
BBM = 80nS
Vs = +/-30V
Pout = 150W
RLoad = 2Ω
BW = 22Hz - 22kHz
Efficiency vs Output Power
0
10
20
30
40
50
60
70
80
90
100
0 50 100 150 200 250 300 350 400 450 500 550 600 650
Output Power (W)
Efficiency (%)
f = 1kHz
BBM = 80nS
Vs = +/- 30V
Rload = 4Ω
Efficiency vs Output Power
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
100.00
0 100 200 300 400 500 600 700 800 900 1000
Output Power (W)
Efficiency (%)
f= 1kHz
BBM = 80nS
Vs = +/-30V
Rload = 2Ω
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
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Tripath Technology, Inc. - Technical Information
TYPICAL PERFORMANCE FOR BRIDGED RB-TA3020-2
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
THD + N (%)
12k2 5 10 20 50 100 200 500 1k
Output Power (W)
f = 1kHz
BBM = 120nS
Vs = +/- 43V
RLoad = 4Ω
BW = 22Hz-22kHz
THD+N vs Output Power
THD+N vs Frequency
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
THD+N (%)
12k2 5 10 20 50 100 200 500 1k
Output Power (W)
f = 1kHz
BBM = 120nS
Vs= +/- 43V
RLoad = 2Ω
BW = 22Hz - 22kHz
THD+N vs Frequency
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
THD+N (%)
20 20k50 100 200 500 1k 2k 5k 10k
Frequency(Hz)
BBM = 120nS
Vs= +/- 43V
Pout = 200W
RLoad = 4Ω
BW = 22Hz - 22kHz
THD+N vs Frequency
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
THD+N (%)
20 20k50 100 200 500 1k 2k 5k 10k
Frequency (Hz)
BBM = 120nS
Vs= +/- 43V
Pout = 200W
RLoad = 2Ω
BW = 22Hz - 22kHz
Efficiency vs Output Power
0
10
20
30
40
50
60
70
80
90
0 100 200 300 400 500 600 700 800 900 1000
Output Power (W)
Efficiency (%)
f = 1kHz
BBM = 120nS
Vs = +/- 43V
Rload = 2Ω
Efficiency vs Output Power
0
10
20
30
40
50
60
70
80
90
100
0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400
Output Power (W)
Efficiency (%)
f = 1kHz
BBM = 120nS
Vs = +/-43V
Rload = 4Ω
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
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Tripath Technology, Inc. - Technical Information
TYPICAL PERFORMANCE FOR BRIDGED RB-TA3020-2
THD+N vs Frequency
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
THD+N (%)
20 20k50 100 200 500 1k 2k 5k 10k
Frequency (Hz)
BBM = 120nS
Vs= +/- 33V
Pout = 200W
RLoad = 2Ω
BW = 22Hz - 22kHz
THD+N vs Output Power
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
THD + N (%)
11k2 5 10 20 50 100 200 500
Output Power (W)
f = 1kHz
BBM = 120nS
Vs= +/- 33V
RLoad = 2Ω
BW = 22Hz - 22kHz
Efficiency vs Output Power
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
0.00 200.00 400.00 600.00 800.00 1000.00
Output Power (W)
Efficiency (%)
f = 1kHz
BBM = 120nS
Vs = +/- 33V
Rload = 2Ω
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
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Tripath Technology, Inc. - Technical Information
TYPICAL PERFORMANCE FOR BRIDGED RB-TA3020-3
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
THD + N (%)
12k2 5 10 20 50 100 200 500 1k
Output Power (W)
f = 1kHz
BBM = 120nS
Vs = +/- 60V
RLoad = 4Ω
BW = 22Hz-22kHz
THD + N vs Output Power
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
THD + N (%)
22k510 20 50 100 200 500 1k
Output Power (W)
1
f = 1kHz
BBM = 120nS
Vs = +/- 60V
RLoad = 2Ω
BW = 22Hz-22kHz
THD + N vs Output Power
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
THD + N (%)
20 20k50 100 200 500 1k 2k 5k 10k
Frequency (Hz)
BBM = 120nS
Vs = +/- 60V
Pout = 300W
RLoad = 2Ω
BW = 22Hz-22kHz
THD + N vs Frequency
0.001
10
0.002
0.005
0.01
0.02
0.05
0.1
0.2
0.5
1
2
5
THD + N (%)
20 20k50 100 200 500 1k 2k 5k 10k
Frequency (Hz)
BBM = 120nS
Vs = +/- 60V
Pout = 300W
RLoad = 4Ω
BW = 22Hz-22kHz
THD + N vs Frequency
Efficiency vs Output Power
0
10
20
30
40
50
60
70
80
90
0 200 400 600 800 1000 1200 1400
Output Power (W)
Efficiency (%)
f = 1kHz
BBM = 120nS
Vs = +/- 60V
Rload = 2Ω
Efficiency vs Output Power
0
10
20
30
40
50
60
70
80
90
100
0 200 400 600 800 1000 1200 1400 1600 1800 2000
Output Power (W)
Efficiency (%)
f = 1kHz
BBM = 120nS
Vs = +/-60V
Rload = 4Ω
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
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Tripath Technology, Inc. - Technical Information
TYPICAL PERFORMANCE FOR BRIDGED RB-TA3020-3
THD+N vs Output Power
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
THD+N (%)
22k510 20 50 100 200 500 1k
Output Power (W)
1
f = 1kHz
BBM = 120nS
Vs= +/- 43V
RLoad = 2Ω
BW = 22Hz - 22kHz
0.01
10
0.02
0.05
0.1
0.2
0.5
1
2
5
THD+N (%)
20 20k50 100 200 500 1k 2k 5k 10k
Frequecy (Hz)
BBM = 120nS
Vs= +/- 43V
Pout = 300W
RLoad = 2Ω
BW = 22Hz - 22kHz
THD+N vs Frequency
Efficiency vs Output Power
0.00
10.00
20.00
30.00
40.00
50.00
60.00
70.00
80.00
90.00
0.00 200.00 400.00 600.00 800.00 1000.00 1200.00 1400.00 1600.00
Output Power (W)
Efficiency (%)
f = 1kHz
BBM = 120nS
Vs = +/- 43V
Rload = 2Ω
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
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Tripath Technology, Inc. - Technical Information
Safe Operating Areas
The TA3020 must always remain in the safe operating area in order to ensure a robust and
reliable design. The Bridged RB-TA3020-X boards have been optimized for 4Ω and 2Ω load
applications. All three of the Bridged RB-TA3020-X boards have been designed to be 1Ω stable,
however the current limit has been set by the OCR resistors (R111 and R211) to not allow the
output to achieve maximum power in order to remain in the safe operating area. If a 1Ω load is
connected to the output, the amplifier will continue to function but will go into an overcurrent
mode when driving a presumable amount of power. For the Bridged RB-TA3020-1 board with a
1Ω load connected to the output, the amplifier will enter the overcurrent mode and shutoff at
approximately 500W. For the Bridged RB-TA3020-2 board with a 1Ω load connected to the
output, the amplifier will enter the overcurrent mode and shutoff at approximately 800W. For the
Bridged RB-TA3020-3 board with a 1Ω load connected to the output, the amplifier will enter the
overcurrent mode and shutoff at approximately 675W. To reset the amplifier after an overcurrent
condition, the mute pin (pin 24) must be toggled or the power supplies must by cycled off and on
to enable the amplifier.
The Bridged RB-TA3020-1 is optimized for a +/-30V power supply and will function from a
minimum of +/-23V to a maximum of +/-36V. At +/-30V the Bridged RB-TA3020-1 will sufficiently
drive a 4Ω and 2Ω load as shown in the Typical Performance graphs.
The Bridged RB-TA3020-2 is optimized for a +/-43V power supply and will function from a
minimum of +/-30V to a maximum of +/-48V. At +/-43V the Bridged RB-TA3020-2 will sufficiently
drive a 4Ω and 2Ω load as shown in the Typical Performance graphs. However with 2Ω load
conditions the amplifier will shutdown if pushed beyond 1200W. In order for the amplifier to
achieve the full output signal swing, the power supply must be reduced to +/- 33V. This will allow
the amplifier to achieve 950W at 10% THD+N with a 2Ω load.
The Bridged RB-TA3020-3 is optimized for a +/-60V power supply and will function from a
minimum of +/-40V to a maximum of +/-64V. At +/-60V the Bridged RB-TA3020-3 will sufficiently
drive a 4Ω and 2Ω load as shown in the Typical Performance graphs. However, with a 2Ω load,
the amplifier will shutdown if pushed beyond 1500W. In order for the amplifier to achieve the full
output signal swing, the power supply must be reduced to +/- 43V. This will allow the amplifier to
achieve 1500W at 10% THD+N with a 2Ω load.
These limitations placed on the amplifier are to ensure the system will remain in the safe
operating area. Changing the values of the OCR resistors (R211 and R111) will change the
overcurrent trip point and thus increase or reduce output power. It is not recommended to
increase the overcurrent trip point to increase the output power, otherwise reliability will be
reduced in the system. For formulas on how to set the overcurrent trip point, please refer to the
TA3020 datasheet.
The safe operating area is dependent upon the power dissipation, the operating ambient
temperature and the heatsinking. As an example, if the Bridged RB-TA3020-3 board is operating
at +/-60V with a 2Ω load. At 400W the amplifier is 68% efficient and the eight output FETs will be
dissipating approximately 133W. Each of the output FETs will be dissipating approximately 17W.
To operate at an ambient temperature of 20OC, the heatsink needs to be be able to keep the
output FETS below the maximum junction temperature of 150OC.
(Maximum Junction Temperature for Output FETs – ambient temperature)/Power dissipated =
θJA of the heatsink
150OC - 20OC = 130OC
130OC / 133W = 0.98OC/W
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
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Tripath Technology, Inc. - Technical Information
In order to run the amplifier at 400W into a 2Ω load continuously at 20OC for an infinite amount of
time, a θJA of 0.98OC/W heatsink is required.
In an application such as a car audio trunk mounted amplifier, where the ambient temperature
can run up to 85OC:
150OC - 85OC = 65OC
65OC / 133W = 0.49OC/W
A θJA of 0.49OC/W heatsink is required in order to operate the amplifier at 400W into a 2Ω load
continuously at 85OC for an infinite amount of time.
The θJA of every heatsink indicates the thermal properties for an infinite amount of time, therefore
a characterization of each heatsink should be done to plot the θJA vs time. This will provide
information for the heatsink characteristics for power dissipation capabilities for a given finite
amount of time.
A system fan can be used to help increase the efficiency of the heatsink. Additional FETs cannot
be added to the RB-TA3020-2 and RBTA3020-3 boards to help the power dissipation because
the TA3020 cannot reliably drive more than 150nC.
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
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Tripath Technology, Inc. - Technical Information
ARCHITECTURE
A block diagram of the evaluation board is shown in Figure 4. The major functional blocks of the
amplifier are described below.
Input
Stage TA3020-65 Output
Section
In
Positive Output
Negative Output
Figure 4
Note: The negative output is identical to the positive output with 180 degrees phase shift.
Input Stage
Figure 5 shows Input Stage before the TA3020. The TA3020 amplifier is designed to accept
unbalanced inputs. For the Bridged RB-TA3020-1, the gain is 12.2 V/V differentially, or
approximately 22 dB. For the Bridged RB-TA3020-2, the gain is 16.8 V/V differentially, or
approximately 24.5 dB. For the Bridged RB-TA3020-3, the gain is 23.8 V/V differentially, or
approximately 27.5 dB. Please note that the input stage of the TA3020 is biased at approximately
2.5VDC. For an input signal centered at ground (0VDC), the polarity of the coupling capacitor,
CIN, shown in Figure 5 is correct.
VP2
VP1
IN2
IN1
BIASCAP
CIN
4.7uF
CB
0.1uF
21
20
25
26
19
RF
20KΩ
+
RIN1
20KΩ
RF
20KΩ
RIN
49.9KΩ
-
+
-
+
499KΩ499KΩ
0.1uF
V5
10KΩ
Pot
Figure 5
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
15
Tripath Technology, Inc. - Technical Information
Figure 6
he resistors, R in Figure 6 (labeled R111 and R211 in the schematic), set the overcurrent
on this evaluation board is pre-set for a 4Ω and 2Ω bridged load application. For lower
damaging the output FETs.
The audio signal is input through pin 20 and fed through an inverting op amp. The output of this
op amp (pin 21) is tied to the input a unity gain inverting op amp. This configuration of cascading
two inverting op amps results in two input signals to the amplifier of equal amplitude and 180
degrees phase shift without the need of an external op amp.
The value of the input capacitor, CIN, in Figure 5 (labeled C200 on the schematic), and the input
resistor, RIN (labeled R200 on the schematic), sets the –3dB point of the input high-pass filter.
The frequency of the input high pass pole, F3dB, –3dB point can be calculated as follows:
F3dB = 1/(2π x CIN x RIN )
where: CIN = input capacitor value in Farads
RIN = input resistor value in Ohms
Output offset voltages can be nulled by adjusting the 10kΩ potentiometer shown in Figure 5.
Once set, the offset does not typically drift with temperature, so no tracking circuitry is required.
Offsets can typically be set to +/- 25 mV. The output offset is trimmed differentially across the
positive and negative outputs, thus only one channel needs the offset trimmed. If a different
TA3020 is placed in the Bridged RB-TA3020 evaluation board, the offset would need to be re-
trimmed.
EB-TA3020 Control Circuitry
The MUTE pin is brought out to an external 2-pin header, J3 (Figure 6). When a jumper is
installed from Pin 1 to 2 of J3, the MUTE line is pulled to ground and the outputs are enabled.
Note that if the MUTE jumper is removed, the MUTE pin floats high, and the amplifier is muted.
BBM0
BBM1
+5V
+5V
J5
J4
22
23
OCR1
OCR2
R111
ROCR
33
C116
R211
31
C216
MUTE 24
AGND
J3
TOCR
threshold for the output devices. Note that these are NOT the sense resistors (the overcurrent
sense resistors, RS, are in the output stage). By adjusting the ROCR resistor values, the threshold
at which the amplifier “trips” can be changed. The range that the overcurrent trip point can be
adjusted (by changing ROCR) is determined by the value of the sense resistors.
ROCR
impedance applications (i.e. 1Ω bridged), this board’s overcurrent will trip. This is indicated by the
amplifier going into mute and the HMUTE pin will latch to 5V; to clear this condition, toggle the
mute or cycle the power. To reduce overcurrent sensitivity, decrease the value of ROCR until the
sensitivity meets the desired level. ROCR can be reduced though this may result in an
overcurrent threshold that is so high the amplifier will try to drive a short circuit, possibly
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
16
Tripath Technology, Inc. - Technical Information
ke (or “BBM”) lines are used to control the “dead time” of the output
ETs. The “dead time” is the period of time between the turn-off of one device and the turn-on of
ifferent operating voltages, different layouts and different performance requirements. For this
ad range of the application to
nsure that any thermal rise of the output FETs and TA3020 does not impact the performance of
BBM1 BBM0 Delay
Finally, the Break-Before-Ma
F
the opposite device on the same channel. If the two devices are both on at the same time,
current “shoots through” from one supply to the other, bypassing the load altogether. Obviously,
this will have a great impact on the overall efficiency of the amplifier. However, if the dead time is
too long, linearity suffers. The optimum BBM setting will change with different output FETs,
d
reason, Tripath has provided a means to adjust the BBM setting among four preset levels by
moving jumpers J2 and J3 on their 3-pin headers (see Figure 6).
These settings should be verified over the full temperature and lo
e
the amplifier. The RB-TA3020-1 and RBTA3020-2 amplifier boards is set to 80nS and the RB-
TA3020-3 is set to 120nS. The table below shows the BBM values for various settings of the
jumpers (Figure 7).
)
) 0 1 80nS
uto Recovery Circuit for Overcurrent Fault Condition
If an overcurrent fault condition occurs the HMUTE pin (pin 15) will be latched high and the
in (pin 24) is toggled high
1 0 0 120nS
2
3) 1 0 40nS
4) 1 1 0nS
J5 J4
Note: The jumper setting shown is 80nS.
0
1
0
1
BBM0 BBM1
Figure 7
A
amplifier will be muted. The amplifier will remain muted until the MUTE p
and then low or the power supplies are turned off and then on again. The circuit shown below in
Figure 8 is a circuit that will detect if HMUTE is high and then toggle the mute pin high and then
low, thus resetting the amplifier. The LED, D1 will turn on when HMUTE is high. The reset time
has been set for approximately 2.5 seconds. The duration of the reset time is controlled by the
RC time constant set by R306 and C311. To increase the reset, time increase the value of C311.
To reduce the reset time, reduce the value of C311. Please note that this circuit is optional and in
not included on the RB-TA3020-X boards.
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
17
Tripath Technology, Inc. - Technical Information
Figure 8
Output Section
The output section includes the gate resistors, gate diodes, source resistors, FETs, output filters,
the previously mentioned overvoltage sense resistors, a Zobel Network, the common mode
capacitor, the common mode zobel network and various bypass capacitors. Figure 8 below
shows the output stage of the positive output of this amplifier. The negative output section was
not included in order to simplify the explaination of the output section. The negative output section
will be symmetrical in terms of component values, component placements, and overall
functionality.
R113
5.6Ω
R124
5.6Ω
R114
5.6Ω
5.6Ω
5.6Ω
5.6Ω
5.6Ω
5.6Ω
R120
R121
R125
R126
R127
M100
M101
M102
M103
D104
D106
D105
D107
R115
0.01Ω
R115
0.01Ω
L100
11uH
C109
330uF
C108
0.1uF
C110
0.1uF
C111
330uF
C114
0.1uF
C112
0.1uF C113
330uF
C117
0.22uF
R128
20Ω
R119
499kΩ
R118
499kΩ
HO1
HO1COM
LO1
LO1COM
VPP
VNN
AMPOUT 1
OCS1HPOCS1HN
OCS1LPOCS1LN
Figure 9
R311
1kΩ, 5%
R307
10kΩ, 5%
R308
10kΩ, 5%
R311
1kΩ, 5%
R306
510kΩ, 5%
R309
1kΩ, 5%
R310
1kΩ, 5%
C311
10uF, NP
Q303
2N7002
R311
1kΩ, 5%
D1
LED
Q302
2N3904
Q304
2N3904
Q305
2N3906
HMUTE
Pin 15
MUTE
Pin 24
V5
AGND
Jumper
remove jumper to
enable mute
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
18
Tripath Technology, Inc. - Technical Information
output during high power operation.
R118 and R119 are gate pull down resistors to ensure the output FETs remain off if VPP and
n and the TA3020 is not powered on. 499kΩ is the ideal value for these
es of R118 and R119 can cause the gate of the output FETs to float and
lel for the purposes of higher current handling capability and improved power
issipation. (Note: Bridged RBTA3020-1 does not have M101 and M103 and it’s associated
components because it has a lower power output) The devices used on the evaluation board are
STW34NB20 MOSFETs. The TA3020 data sheet contains information on output FET selection as
well as Tripath application notes “FETs – Selection and Efficiency” and “Designing with Switching
Amplifiers for Performance and Reliability”.
The output filter L100/C114 is the low-pass filter that recovers the analog audio signal. One of the
benefits of the Class-T design is the ability to use output filters with relatively high cutoff
frequencies. This greatly reduces the speaker interactions that can occur with the use of lower-
frequency filters common in Class-D designs. Also, the higher-frequency operation means that
the filter can be of a lower order (simpler and less costly).
The OEM may benefit from some experimentation in the filter design, but the values provided in
the reference design, 11uH, 0.1uF, 0.22uF (nominal resonant frequency of 65kHz), provide
excellent results for most loads between 2Ω and 4Ω. Figure 10 below shows the SPICE simultion
results for the output filter used on the Bridged RB-TA3020-3 board with a 4Ω load. Figure 11
below shows the SPICE simulation results for the output filter used on the Bridged RB-TA3020-3
board with a 2Ω load. The Y axis of the graph is in units of dB referred to 1V. The X axis of the
graph is in units of Hz. All of the Bridged RB-TA3020-X boards will have the same frequency
response, however the gains will be different.
The gate resistors (labeled R113, R114, R120, and R121 in Figure 9 and the attached schematic)
are used to control MOSFET switching rise/fall mes and thereby minimize voltage overshoots.
They also dissipate a portion of the power resu ng from moving the gate charge each time the
MOSFET is switched. If RG is too small, excessive heat can be generated in the driver. Large
gate resistors lead to slower gate transitions res
larger BBM setting.
The gate diodes (D104, D105, D106, D107) are used to reduce the fall time at the gate of the
output FETs. This allows us to use the 5.6Ω gate resistor, which increases the rise time of the
gate, reduces switching noise at the output FETs and reduce the overall noise floor of the amplifier.
The source resistors (R124, R125, R126, R127) are recommended to protect the TA3020 from
any overvoltage damage. The source resistors p ovide protection to the HO1COM and LO1COM
pins due to the large overshoots and undershoots of the switching waveform that can occur at the
ti
lti
ulting in longer rise/fall times and thus requiring a
r
VNN are powered o
resistors. Larger valu
smaller values of R118 and R119 will affect the drive capabilities of the HO1 and LO1 pins.
The output FETs (M100, M101, M200 and M201) provide the switching function required of a
Class-T design. They are driven directly by the TA3020 through the gate resistors. M100 and
M102 are placed in parallel and provide the high side drive of the output stage. M101 and M103
are in parallel and provide the low side drive of the output stage. The FETs are required to be
placed in paral
d
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
19
Tripath Technology, Inc. - Technical Information
Figure 10
Figure 11
As important as the values themselves, the material used in the core is important to the performance of
the filter. Core materials that saturate easily will not provide acceptable distortion or efficiency
figures. Tripath recommends a low-mu core, like type 2 iron powder core. Micrometals,
(www.micrometals.com), is a main supplier of iron powder cores. The core part number used on
the Bridged RB-TA3020-1 and the Bridged RB-TA3020-2 is T106-2. The core part number used
on the Bridged RB-TA3020-3 is T157-2.
The Zobel circuit R128/C117 is used in case the amplifier is powered up with no load attached.
The Q of the LC output filter, with no load attached, rises quickly out to 80kHz. Resonant currents
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
20
Tripath Technology, Inc. - Technical Information
in the filter and ringing on the output could reduce the reliability of the amplifier. The Zobel
eliminates these problems by reducing the Q of the network significantly above 50kHz. Modifying
the LC output filter will require a recalculation of the Zobel value, and depending on the
application, the power capability of R117 and R217 may need to be increased to 10W from 5W.
The components used on the evaluation board should be adequate for most applications.
Figure 12
Figure 12 shows the differential filter network. The differential capacitor, C5, is used to reduce
any of the differential switching components between the positive and negative outputs. Similar to
the zobel circuit, the common mode zobel network, is used in case the amplifier is powered up
with no load attached to the output. The common mode LC output filter formed by L100, L200 and
C5 has a Q that rises quickly out to 80kHz. Common mode resonant currents in the filter and
ringing on the output could reduce the re f the amplifier. This common mode zobel
network reduces the Q of the common mode LC
The bypass capacitors C108/C109 are critical to the reduction of ringing, overshoots, and
undershoots on the outputs of the FETs. These parts are placed as closely as possible to the
leads of the FETs, and the leads of the capacitors themselves are as short as practical. Their
values will not change with different output FETs.
Differences between the Bridged RB-TA3020-X boards
The Bridged RB-TA3020-X boards can be directly implemented into a system. They were
intended to be scalable and modular to help simplify the manufacturing of multiple systems with
varying output power. This is the reason there are three boards for three different power levels
that use identical PC boards. The differences between the three boards are changes in resistor
values and capacitor voltages. Please refer to the bill of materials that is attached at the end of
this document for the actual values of components used for each board.
DOCUMENTATION
Schematics and layout in software or paper form can be provided upon request.
R6
20Ω, 5W
C6
0.22uF
C5
0.22uF
AMPOUT 1AMPOUT 2
liability o
output filter significantly above 50kHz.
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
21
Tripath Technology, Inc. - Technical Information
Bridged RB-TA3020-1-3 – MC/1.0/06-01, EAD003
22
ADVANCED INFORMATION
This is a product in development. Tripath Technology, Inc. reserves the right to make any changes
without further notice to improve reliability, function and design.
Tripath and Digital Power Processing are trademarks of Tripath Technology, Inc. Other trademarks
referenced in this document are owned by their respective companies.
Tripath Technology, Inc. reserves the right to make changes without further notice to any products
herein to improve reliability, function or design. Tripath does not assume any liability arising out of the
application of use of any product or circuit described herein; neither does it convey any license under its
patent rights nor the rights of others.
TRIPATH’S PRODUCT ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE
SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN CONSENT OF THE
PRESIDENT OF TRIPATH TECHONOLOGY, INC. As used herein:
1. Life support devices or systems are devices or systems which, (a) are intended for surgical
implant into the body, or (b) support or sustain life, and whose failure to perform, when
properly used in accordance with instructions for use provided in this labeling, can be
reasonably expected to result in significant injury of the user.
2. A critical component is any component of a life support device or system whose failure to
perform can be reasonably expected to cause the failure of the life support device or system,
or to affect its safety or effectiveness.
Contact Information
TRIPATH TECHNOLOGY, INC
2560 Orchard Parkway, San Jose, CA 95131
408.750.3000 - P
408.750.3001 - F
For more Sales Information, please visit us @ www.tripath.com/cont_s.htm
For more Technical Information, please visit us @ www.tripath.com/data.htm
1 2 3 4 5 6
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Title
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C
Date: 12-Jul-2001 Sheet of
File: C:\LAYOUTS\TA3020\3020SUB3\BR3020_1.SCHDrawn By:
J3
R201
20K,1% C201
33pF
IN2
R101
20K,1%
C101
33pF
IN1
R200
49.9K,1%
R100
20K,1%
C1
0.1uF
C3
0.1uF
C4
0.1uF
AGND
AGND
R1
8.25K,1% AGND
AGND
R205
1K,1%
R207
1.15K,1%
R206
7.5K,1%
V5
R208
1K,1%
R210
1.15K,1%
R209
7.5K,1%
AGND
AGND
R105
1K,1%
R107
1.15K,1%
R106
7.5K,1%
V5
OCRNT1OCRNT2
R111
13.3K,1%
C116
220pF
AGND
R211
13.3K,1%
C216
220pF
AGND
OCRNT1
OCRNT2
C200
4.7uF
AGND
AGND
R3
237K,1%
R5
261K,1%
V5
V5
V5
FN1
FN2
FP2
FB1
PGND2
FB2
VPP
VNN
R4
261K,1%
VNN
M101
STW34NB20
M100
NS C110
0.1uF/250V/EF
C112
0.1uF/250V/EF
C108
0.1uF/250V/EF
C213
390uF/50V
1 2
L100
11uH
C114
0.1uF/100V/PPS
R113
NS
R114
5.6OHM/1W
R115
0.01OHM/1W
R116
0.01OHM/1W VNN
VPP
AMPOUT1
PGND1
M201
STW34NB20
M200
NS
C210
0.1uF/250V/EF
C212
0.1uF/250V/EF
C208
0.1uF/250V/EF
C211
390uF/50V
12
L200
11uH
C214
0.1uF/100V/PPS
R213
NS
R214
5.6OHM/1W
R215
0.01OHM/1W
R216
0.01OHM/1W
VNN
VPP
AMPOUT2
PGND2
C204
47uF/25V D202
MURS120T3
C104
47uF/25V
D102
MURS120T3
R112
220OHM
R7
1K
TA3020 BRIDGED REFERENCE BOARD - 1 - 23V TO 36V
J4
VNN
J1 V5
AGND
VN10
FB2
J200
AGND
5V INPUT CONNECTOR
MUTE
REMOVE J3 SHUNT TO ENABLE MUTE
C8
100uF/16V
1 2
L1
FBEAD
C207
0.1uF
C107
0.1uF
AGND
AGND
AGND
C102
150pF
C202
270pF
3.0
R218
510K
R118
510K
R119
510K
VP2
VP2
C203
0.1uF
R212
220OHM
C206
0.1uF/250V/EB
C205
0.1uF/250V/EB
C105
0.1uF/250V/EB
C106
0.1uF/250V/EB
C103
0.1uF
M203
NS
M202
STW34NB20
R220
5.6OHM/1W
R221
NS
HMUTE
M103
NS
M102
STW34NB20
R120
5.6OHM/1W
R121
NS
C111
390uF/50V
C113
390uF/50V
FB1
R124
NS
R125
5.6OHM/1W
R126
5.6OHM/1W
R127
NS
R224
NS
R225
5.6OHM/1W
R226
5.6OHM/1W
R227
NS
V5
C6
0.22uF/100V/PPS
R6
20OHM/5W
C5
0.22uF/100V/PPS AMPOUT1AMPOUT2
BRIDGED OUTPUT
AGND
J2
CON6
VPP
VNN
VN10
J201
SCRWTERM J101
SCRWTERM
C117
0.22uF/100V/PPS
R128
20OHM/5W
C217
0.22uF/100V/PPS
R228
20OHM/5W
R104
10K POT
R102
510K
R103
510K
C120
0.1uF
AGND
V5 OFFSET TRIM
D206
1N914
D204
NS
D205
1N914
D207
NS
D104
NS
D105
1N914
D106
1N914
D107
NS
C109
330uF/100V
C209
330uF/100V
R219
510K
J202
CON4
J102
CON4
J5
R9
715K,1%
SET BBM1 T0 0
SET BBM0 T0 1
VN10
1
LO2
2
LO2COM
3
HO2COM
4
HO2
5
OCS2LN
6
OCS2LP
7
OCS2HP
8
OCS2HN
9
VBOOT2
10
NC
11
OCR2
12
FBKOUT1
13
FBKGND1
14
HMUTE
15
FBKOUT2
16
DCOMP
17
FBKGND2
18
BIASCAP
19
INV2
20
OAOUT2
21
BBM0
22
BBM1
23
MUTE
24 INV1 25
OAOUT1 26
V5 27
AGND 28
VPPSENSE 29
VNNSENSE 30
OCR2 31
REF1 32
OCR1 33
DGND 34
V5 35
NC 36
OCR1 37
NC 38
VNN 39
VBOOT1 40
OCS1LN 41
OCS1LP 42
OCS1HP 43
OCS1HN 44
HO1 45
HO1COM 46
LO1COM 47
LO1 48
I1
TA3020
C:\LAYOUTS\TA3020\3020SUB3\BR3020_1.BOM 11:13:42 12-Jul-2001
Bill of Material for Bridged RB-TA3020-1, Rev 3.0
Used Part Type Designator Footprint Part Field 1 Part Field 2 Part Field 3
==== =============== ==================== =========== =================== ============ ===============
4 0.01OHM/1W R115 R116 R215 R216 RLVR1RG2 OHMITE 12F010 DK 12F010-ND
8 0.1uF C1 C103 C107 C120 0805 20% TOL. * *
C203 C207 C3 C4
2 0.1uF/100V/PPS C114 C214 C0U22PPS10 PANASONIC ECH-S1104JZ DK PS1104J-ND
4 0.1uF/250V/EB C105 C106 C205 C206 C0U1MF10 PANASONIC ECQ-E2104KB DK P10967-ND
6 0.1uF/250V/EF C108 C110 C112 C208 C0U1MF10 PANASONIC ECQ-E2104KF EF2104-ND
C210 C212
4 0.22uF/100V/PPS C117 C217 C5 C6 C0U22PPS10 PANASONIC ECH-S1224JZ DK PS1224J-ND
3 1.15K,1% R107 R207 R210 0805 * * *
1 100uF/16V C8 C10UEL05 PANASONIC ECA-1CHG101 DK P5529-ND
1 10K POT R104 POTSTURN BOURNS 3306P-1-103 DK 3306P-103-ND
2 11uH L100 L200 T106 COIL WINDING SPEC T106-2 CORE 29TURNS / 16AWG
2 13.3K,1% R111 R211 0805 * * *
1 150pF C102 0805 NPO 5% * *
1 1K R7 0805 5% * *
3 1K,1% R105 R205 R208 0805 * * *
4 1N914 D105 D106 D205 D206 1N914L *
3 20K,1% R100 R101 R201 0805 * * *
3 20OHM/5W R128 R228 R6 PWR5WRT XICON 280-PRM5-20
2 220OHM R112 R212 RES1W50 5%, 1/4W
2 220pF C116 C216 0805 NPO 5% * *
1 237K,1% R3 0805 * * *
2 261K,1% R4 R5 0805 * * *
1 270pF C202 0805 NPO 5% * *
2 330uF/100V C109 C209 C330UEL10 PANASONIC EEU-FC2A331S DK P10783-ND
2 33pF C101 C201 0805 NPO 5% * *
4 390uF/50V C111 C113 C211 C213 C100UEL06 PANASONIC EEU-FC1H391S DK P10327-ND
1 4.7uF C200 C10UEL05 PANASONIC ECA-1HHG4R7 DK P5566-ND
2 47uF/25V C104 C204 C10UEL05 PANASONIC ECA-1HHG220 DK P5568-ND
1 49.9K,1% R200 0805 * * *
8 5.6OHM/1W R114 R120 R125 R126 RES1W50 PANASONIC ERG-1SJ5R6 P5.6W-1BK-ND
R214 R220 R225 R226
6 510K R102 R103 R118 R119 0805 5% TOL. * *
R218 R219
3 7.5K,1% R106 R206 R209 0805 * * *
Page 1
C:\LAYOUTS\TA3020\3020SUB3\BR3020_1.BOM 11:13:42 12-Jul-2001
1 715K,1% R9 0805 * * *
1 8.25K,1% R1 0805 * * *
1 CON2INPT J200 CON2 WALDOM 705-43-0001 DK WM4800-ND
1 CON2LPWR J1 CON2B WALDOM 22-23-2021 DK WM4200-ND
2 CON4 J102 J202 BUSBAR1 * * *
1 CON6 J2 PWRCON6 * * *
1 FBEAD L1 2512 SPC/MULTICOMP SPC5304 Newark - 50N670
1 HDR2 J3 GJMPR001 * * *
2 HDR3 J4 J5 GJMP3001 * * *
2 MURS120T3 D102 D202 SMB MOTOROLA MURS120T3 *
16 NS D104 D107 D204 D207 1N914L *
M100 M103 M200 M203
R113 R121 R124 R127
R213 R221 R224 R227
2 SCRWTERM J101 J201 SCRWTERM * * *
4 STW34NB20 M101 M102 M201 M202 TO3P&220FLT ST MICROELECTRONICS * *
1 TA3020 I1 DIP48 TRIPATH * *
1 2 3 4 5 6
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R201
20K,1% C201
33pF
IN2
R101
20K,1%
C101
33pF
IN1
R200
49.9K,1%
R100
20K,1%
C1
0.1uF
C3
0.1uF
C4
0.1uF
AGND
AGND
R1
8.25K,1% AGND
AGND
R205
1K,1%
R207
1.10K,1%
R206
10.5K,1%
V5
R208
1K,1%
R210
1.10K,1%
R209
10.5K,1%
AGND
AGND
R105
1K,1%
R107
1.10K,1%
R106
10.5K,1%
V5
OCRNT1OCRNT2
R111
12.3K,1%
C116
220pF
AGND
R211
12.3K,1%
C216
220pF
AGND
OCRNT1
OCRNT2
C200
4.7uF
AGND
AGND
R3
316K,1%
R5
348K,1%
V5
V5
V5
FN1
FN2
FP2
FB1
PGND2
FB2
VPP
VNN
R4
348K,1%
VNN
M101
STW34NB20
M100
STW34NB20 C110
0.1uF/250V/EF
C112
0.1uF/250V/EF
C108
0.1uF/250V/EF
C213
470uF/63V
1 2
L100
11uH
C114
0.1uF/100V/PPS
R113
10OHM/1W
R114
510OHM/1W
R115
0.01OHM/1W
R116
0.01OHM/1W VNN
VPP
AMPOUT1
PGND1
M201
STW34NB20
M200
STW34NB20
C210
0.1uF/250V/EF
C212
0.1uF/250V/EF
C208
0.1uF/250V/EF
C211
470uF/63V
12
L200
11uH
C214
0.1uF/100V/PPS
R213
10OHM/1W
R214
10OHM/1W
R215
0.01OHM/1W
R216
0.01OHM/1W
VNN
VPP
AMPOUT2
PGND2
C204
47uF/25V D202
MURS120T3
C104
47uF/25V
D102
MURS120T3
R112
220OHM
R7
1K
TA3020 BRIDGED REFERENCE BOARD - 2 - 30V TO 48V
J4
VNN
J1 V5
AGND
VN10
FB2
J200
AGND
5V INPUT CONNECTOR
MUTE
REMOVE J3 SHUNT TO ENABLE MUTE
C8
100uF/16V
C207
0.1uF
C107
0.1uF
AGND
AGND
AGND
C102
75pF
C202
180pF
3.0
R218
510K
R118
510K
R119
510K
VP2
VP2
C203
0.1uF
R212
220OHM
C206
0.1uF/250V/EB
C205
0.1uF/250V/EB
C105
0.1uF/250V/EB
C106
0.1uF/250V/EB
C103
0.1uF
M203
STW34NB20
M202
STW34NB20
R220
10OHM/1W
R221
10OHM/1W
HMUTE
M103
STW34NB20
M102
STW34NB20
R120
510OHM/1W
R121
10OHM/1W
C111
470uF/63V
C113
470uF/63V
FB1
R124
5.6OHM/1W
R125
5.6OHM/1W
R126
5.6OHM/1W
R127
5.6OHM/1W
R224
5.6OHM/1W
R225
5.6OHM/1W
R226
5.6OHM/1W
R227
5.6OHM/1W
V5
C6
0.22uF/100V/PPS
R6
20OHM/5W
C5
0.22uF/100V/PPS AMPOUT1AMPOUT2
BRIDGED OUTPUT
AGND
J2
CON6
VPP
VNN
VN10
J201
SCRWTERM J101
SCRWTERM
C117
0.22uF/100V/PPS
R128
20OHM/5W
C217
0.22uF/100V/PPS
R228
20OHM/5W
R104
10K POT
R102
510K
R103
510K
C120
0.1uF
AGND
V5 OFFSET TRIM
D206
1N914
D204
1N914
D205
1N914
D207
1N914
D104
1N914
D105
1N914
D106
1N914
D107
1N914
C109
220uF/160V
C209
220uF/160V
R219
510K
J202
CON4
J102
CON4
J5
R9
953K,1%
SET BBM1 T0 0
SET BBM0 T0 0
VN10
1
LO2
2
LO2COM
3
HO2COM
4
HO2
5
OCS2LN
6
OCS2LP
7
OCS2HP
8
OCS2HN
9
VBOOT2
10
NC
11
OCR2
12
FBKOUT1
13
FBKGND1
14
HMUTE
15
FBKOUT2
16
DCOMP
17
FBKGND2
18
BIASCAP
19
INV2
20
OAOUT2
21
BBM0
22
BBM1
23
MUTE
24 INV1 25
OAOUT1 26
V5 27
AGND 28
VPPSENSE 29
VNNSENSE 30
OCR2 31
REF1 32
OCR1 33
DGND 34
V5 35
NC 36
OCR1 37
NC 38
VNN 39
VBOOT1 40
OCS1LN 41
OCS1LP 42
OCS1HP 43
OCS1HN 44
HO1 45
HO1COM 46
LO1COM 47
LO1 48
I1
TA3020
1 2
L1
FBEAD
C:\LAYOUTS\TA3020\3020SUB3\BR3020_2.BOM 11:11:54 12-Jul-2001
Bill of Material for Bridged RB-TA3020-2, Rev 3.0
Used Part Type Designator Footprint Part Field 1 Part Field 2 Part Field 3
==== =============== ==================== =========== =================== ============ ===============
4 0.01OHM/1W R115 R116 R215 R216 RLVR1RG2 OHMITE 12F010 DK 12F010-ND
8 0.1uF C1 C103 C107 C120 0805 20% TOL. * *
C203 C207 C3 C4
2 0.1uF/100V/PPS C114 C214 C0U22PPS10 PANASONIC ECH-S1104JZ DK PS1104J-ND
4 0.1uF/250V/EB C105 C106 C205 C206 C0U1MF10 PANASONIC ECQ-E2104KB DK P10967-ND
6 0.1uF/250V/EF C108 C110 C112 C208 C0U1MF10 PANASONIC ECQ-E2104KF EF2104-ND
C210 C212
4 0.22uF/100V/PPS C117 C217 C5 C6 C0U22PPS10 PANASONIC ECH-S1224JZ DK PS1224J-ND
3 1.10K,1% R107 R207 R210 0805 * * *
3 10.5K,1% R106 R206 R209 0805 * * *
1 100uF/16V C8 C10UEL05 PANASONIC ECA-1CHG101 DK P5529-ND
1 10K POT R104 POTSTURN BOURNS 3306P-1-103 DK 3306P-103-ND
6 10OHM/1W R113 R121 R213 R214 RES1W50 PANASONIC ERG-1SJ5R6 P5.6W-1BK-ND
R220 R221
2 11uH L100 L200 T106 COIL WINDING SPEC T106-2 CORE 29TURNS / 16AWG
2 12.3K,1% R111 R211 0805 * * *
1 180pF C202 0805 NPO 5% * *
1 1K R7 0805 5% * *
3 1K,1% R105 R205 R208 0805 * * *
8 1N914 D104 D105 D106 D107 1N914L *
D204 D205 D206 D207
3 20K,1% R100 R101 R201 0805 * * *
3 20OHM/5W R128 R228 R6 PWR5WRT XICON 280-PRM5-20
2 220OHM R112 R212 RES1W50 5%, 1/4W
2 220pF C116 C216 0805 NPO 5% * *
2 220uF/160V C109 C209 C330UEL10 PANASONIC EEU-EB2C221S DK P5910-ND
1 316K,1% R3 0805 * * *
2 33pF C101 C201 0805 NPO 5% * *
2 348K,1% R4 R5 0805 * * *
1 4.7uF C200 C10UEL05 PANASONIC ECA-1HHG4R7 DK P5566-ND
4 470uF/63V C111 C113 C211 C213 C100UEL06 PANASONIC EEU-FC1J471 DK P10352-ND
2 47uF/25V C104 C204 C10UEL05 PANASONIC ECA-1HHG220 DK P5568-ND
1 49.9K,1% R200 0805 * * *
8 5.6OHM/1W R124 R125 R126 R127 RES1W50 PANASONIC ERG-1SJ5R6 P5.6W-1BK-ND
R224 R225 R226 R227
Page 1
C:\LAYOUTS\TA3020\3020SUB3\BR3020_2.BOM 11:11:54 12-Jul-2001
6 510K R102 R103 R118 R119 0805 5% TOL. * *
R218 R219
2 510OHM/1W R114 R120 RES1W50 PANASONIC ERG-1SJ5R6 P5.6W-1BK-ND
1 75pF C102 0805 NPO 5% * *
1 8.25K,1% R1 0805 * * *
1 953K,1% R9 0805 * * *
1 CON2INPT J200 CON2 WALDOM 705-43-0001 DK WM4800-ND
1 CON2LPWR J1 CON2B WALDOM 22-23-2021 DK WM4200-ND
2 CON4 J102 J202 BUSBAR1 * * *
1 CON6 J2 PWRCON6 * * *
1 FBEAD L1 2512 SPC/MULTICOMP SPC5304 Newark - 50N670
1 HDR2 J3 GJMPR001 * * *
2 HDR3 J4 J5 GJMP3001 * * *
2 MURS120T3 D102 D202 SMB MOTOROLA MURS120T3 *
2 SCRWTERM J101 J201 SCRWTERM * * *
8 STW34NB20 M100 M101 M102 M103 TO3P&220FLT ST MICROELECTRONICS * *
M200 M201 M202 M203
1 TA3020 I1 DIP48 TRIPATH * *
1 2 3 4 5 6
A
B
C
D
6
54321
D
C
B
A
Title
Number RevisionSize
C
Date: 12-Jul-2001 Sheet of
File: C:\LAYOUTS\TA3020\3020SUB3\BR3020_3.SCHDrawn By:
J3
R201
20K,1% C201
33pF
IN2
R101
20K,1%
C101
33pF
IN1
R200
49.9K,1%
R100
20K,1%
C1
0.1uF
C3
0.1uF
C4
0.1uF
AGND
AGND
R1
8.25K,1% AGND
AGND
R205
1K,1%
R207
1.07K,1%
R206
15K,1%
V5
R208
1K,1%
R210
1.07K,1%
R209
15K,1%
AGND
AGND
R105
1K,1%
R107
1.07K,1%
R106
15K,1%
V5
OCRNT1OCRNT2
R111
11.3K,1%
C116
220pF
AGND
R211
11.3K,1%
C216
220pF
AGND
OCRNT1
OCRNT2
C200
4.7uF
AGND
AGND
R3
422K,1%
R5
464K,1%
V5
V5
V5
FN1
FN2
FP2
FB1
PGND2
FB2
VPP
VNN
R4
464K,1%
VNN
M101
STW34NB20
M100
STW34NB20 C110
0.1uF/250V/EF
C112
0.1uF/250V/EF
C108
0.1uF/250V/EF
C213
470uF/63V
1 2
L100
11uH
C114
0.1uF/100V/PPS
R113
10OHM/1W
R114
10OHM/1W
R115
0.01OHM/1W
R116
0.01OHM/1W VNN
VPP
AMPOUT1
PGND1
M201
STW34NB20
M200
STW34NB20
C210
0.1uF/250V/EF
C212
0.1uF/250V/EF
C208
0.1uF/250V/EF
C211
470uF/63V
12
L200
11uH
C214
0.1uF/100V/PPS
R213
10OHM/1W
R214
10OHM/1W
R215
0.01OHM/1W
R216
0.01OHM/1W
VNN
VPP
AMPOUT2
PGND2
C204
47uF/25V D202
MURS120T3
C104
47uF/25V
D102
MURS120T3
R112
220OHM
R7
1K
TA3020 BRIDGED REFERENCE BOARD - 3 - 40V TO 64V
J4
VNN
J1 V5
AGND
VN10
FB2
J200
AGND
5V INPUT CONNECTOR
MUTE
REMOVE J3 SHUNT TO ENABLE MUTE
C8
100uF/16V
C207
0.1uF
C107
0.1uF
AGND
AGND
AGND
C102
62pF
C202
150pF
3.0
R218
510K
R118
510K
R119
510K
VP2
VP2
C203
0.1uF
R212
220OHM
C206
0.1uF/250V/EB
C205
0.1uF/250V/EB
C105
0.1uF/250V/EB
C106
0.1uF/250V/EB
C103
0.1uF
M203
STW34NB20
M202
STW34NB20
R220
10OHM/1W
R221
10OHM/1W
HMUTE
M103
STW34NB20
M102
STW34NB20
R120
10OHM/1W
R121
10OHM/1W
C111
470uF/63V
C113
470uF/63V
FB1
R124
5.6OHM/1W
R125
5.6OHM/1W
R126
5.6OHM/1W
R127
5.6OHM/1W
R224
5.6OHM/1W
R225
5.6OHM/1W
R226
5.6OHM/1W
R227
5.6OHM/1W
V5
C6
0.22uF/250V
R6
20OHM/5W
C5
0.22uF/250V AMPOUT1AMPOUT2
BRIDGED OUTPUT
AGND
J2
CON6
VPP
VNN
VN10
J201
SCRWTERM J101
SCRWTERM
C117
0.22uF/250V
R128
20OHM/5W
C217
0.22uF/250V
R228
20OHM/5W
R104
10K POT
R102
510K
R103
510K
C120
0.1uF
AGND
V5 OFFSET TRIM
D206
1N914
D204
1N914
D205
1N914
D207
1N914
D104
1N914
D105
1N914
D106
1N914
D107
1N914
C109
220uF/160V
C209
220uF/160V
R219
510K
J202
CON4
J102
CON4
J5
R9
1.27M,1%
SET BBM1 T0 0
SET BBM0 T0 0
VN10
1
LO2
2
LO2COM
3
HO2COM
4
HO2
5
OCS2LN
6
OCS2LP
7
OCS2HP
8
OCS2HN
9
VBOOT2
10
NC
11
OCR2
12
FBKOUT1
13
FBKGND1
14
HMUTE
15
FBKOUT2
16
DCOMP
17
FBKGND2
18
BIASCAP
19
INV2
20
OAOUT2
21
BBM0
22
BBM1
23
MUTE
24 INV1 25
OAOUT1 26
V5 27
AGND 28
VPPSENSE 29
VNNSENSE 30
OCR2 31
REF1 32
OCR1 33
DGND 34
V5 35
NC 36
OCR1 37
NC 38
VNN 39
VBOOT1 40
OCS1LN 41
OCS1LP 42
OCS1HP 43
OCS1HN 44
HO1 45
HO1COM 46
LO1COM 47
LO1 48
I1
TA3020
1 2
L1
FBEAD
C:\LAYOUTS\TA3020\3020SUB3\BR3020_3.BOM 11:10:31 12-Jul-2001
Bill of Material for Bridged RB-TA3020-3, Rev 3.0
Used Part Type Designator Footprint Part Field 1 Part Field 2 Part Field 3
==== ============== ==================== =========== =================== ============ ===============
4 0.01OHM/1W R115 R116 R215 R216 RLVR1RG2 OHMITE 12F010 DK 12F010-ND
8 0.1uF C1 C103 C107 C120 0805 20% TOL. * *
C203 C207 C3 C4
2 0.1uF/100V/PPS C114 C214 C0U22PPS10 PANASONIC ECH-S1104JZ DK PS1104J-ND
4 0.1uF/250V/EB C105 C106 C205 C206 C0U1MF10 PANASONIC ECQ-E2104KB DK P10967-ND
6 0.1uF/250V/EF C108 C110 C112 C208 C0U1MF10 PANASONIC ECQ-E2104KF EF2104-ND
C210 C212
4 0.22uF/250V C117 C217 C5 C6 C0U22PPS10 PANASONIC ECW-F2224JB DK PF2224-ND
3 1.07K,1% R107 R207 R210 0805 * * *
1 1.27M,1% R9 0805 * * *
1 100uF/16V C8 C10UEL05 PANASONIC ECA-1CHG101 DK P5529-ND
1 10K POT R104 POTSTURN BOURNS 3306P-1-103 DK 3306P-103-ND
8 10OHM/1W R113 R114 R120 R121 RES1W50 PANASONIC ERG-1SJ5R6 P10W-1BK-ND
R213 R214 R220 R221
2 11.3K,1% R111 R211 0805 * * *
2 11uH L100 L200 T106 COIL WINDING SPEC T157-2 CORE 28TURNS / 14AWG
1 150pF C202 0805 NPO 5% * *
3 15K,1% R106 R206 R209 0805 * * *
1 1K R7 0805 5% * *
3 1K,1% R105 R205 R208 0805 * * *
8 1N914 D104 D105 D106 D107 1N914L *
D204 D205 D206 D207
3 20K,1% R100 R101 R201 0805 * * *
3 20OHM/5W R128 R228 R6 PWR5WRT XICON 280-PRM5-20
2 220OHM R112 R212 RES1W50 5%, 1/4W
2 220pF C116 C216 0805 NPO 5% * *
2 220uF/160V C109 C209 C330UEL10 PANASONIC EEU-EB2C221S DK P5910-ND
2 33pF C101 C201 0805 NPO 5% * *
1 4.7uF C200 C10UEL05 PANASONIC ECA-1HHG4R7 DK P5566-ND
1 422K,1% R3 0805 * * *
2 464K,1% R4 R5 0805 * * *
4 470uF/63V C111 C113 C211 C213 C100UEL06 PANASONIC EEU-FC1J471 DK P10352-ND
2 47uF/25V C104 C204 C10UEL05 PANASONIC ECA-1HHG220 DK P5568-ND
1 49.9K,1% R200 0805 * * *
8 5.6OHM/1W R124 R125 R126 R127 RES1W50 PANASONIC ERG-1SJ5R6 P5.6W-1BK-ND
Page 1
C:\LAYOUTS\TA3020\3020SUB3\BR3020_3.BOM 11:10:31 12-Jul-2001
R224 R225 R226 R227
6 510K R102 R103 R118 R119 0805 5% TOL. * *
R218 R219
1 62pF C102 0805 NPO 5% * *
1 8.25K,1% R1 0805 * * *
1 CON2INPT J200 CON2 WALDOM 705-43-0001 DK WM4800-ND
1 CON2LPWR J1 CON2B WALDOM 22-23-2021 DK WM4200-ND
2 CON4 J102 J202 BUSBAR1 * * *
1 CON6 J2 PWRCON6 * * *
1 FBEAD L1 2512 SPC/MULTICOMP SPC5304 Newark - 50N670
1 HDR2 J3 GJMPR001 * * *
2 HDR3 J4 J5 GJMP3001 * * *
2 MURS120T3 D102 D202 SMB MOTOROLA MURS120T3 *
2 SCRWTERM J101 J201 SCRWTERM * * *
8 STW34NB20 M100 M101 M102 M103 TO3P&220FLT ST MICROELECTRONICS * *
M200 M201 M202 M203
1 TA3020 I1 DIP48 TRIPATH * *
