Tripath Technology, Inc. - Technical Information
RB-TA3020-1 RB-TA3020-2
CLASS-T DIGITAL AUDIO AMPLIFIER REFERENCE BOARD
USING DIGITAL POWER PROCESSING (DPPTM) TECHNOLOGY
Technical Information
Revision 3.0- March 2002
GENERAL DESCRIPTION
The RB-TA3020 reference board is based on the TA3020 digital audio power
amplifier driver from Tripath Technology. This board is designed to provide a
simple and straightforward environment for the evaluation of the Tripath stereo
TA3020 amplifier. This board can also be used in a bridged configuration for high
power mono output.
Note: There are two versions of the RB-TA3020, depending on nominal supply
voltage.
RB-TA3020-1 – Nominal supply voltage +/-21V to +/-39V
RB-TA3020-2 – Nominal supply voltage +/-35V to +/-60V
Features
RB-TA3020-1: 2 x 70W continuous
output power @ 0.1% THD+N, 4Ω, +28V
RB-TA3020-1: 250W continuous output
power @ 0.1% THD+N, bridged 4Ω, +28V
RB-TA3020-2: 2 x 175W continuous
output power @ 0.1% THD+N, 4Ω, +45V
RB-TA3020-2: 525W continuous output
power @ 0.1% THD+N, bridged 4Ω, +45V
Outputs short circuit protected
Benefits
Uses only N-channel power MOSFETs
Ready to use in many applications:
2 channel stereo systems
Powered 2.1 speaker systems
Powered Subwoofers
1 RB-TA3020, Rev. 3.0/03.02
Note: RB-TA3020-2 shown
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. All output and power supply connections are
made using tinned wire (not shown).
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). Please 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 RB-TA3020.
VPP (yellow)
VN10 (green)
VNN (orange)
V5 (red)
PGND (blue)
VS
VS
5V
10V
AGND (black)
Figure 1
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 RB-TA3020.
Connector Power Supply
J5 (Yellow) VPP
J5 (Blue) PGND
J5 (Orange) VNN
J5 (Green) VN10
J1 (Red) V5
J1 (Black) AGND
Table 1
2 RB-TA3020, Rev. 3.0/03.02
Tripath Technology, Inc. - Technical Information
Input Connections
Audio input to the board is located at CH1 INPUT (J100) and CH2 INPUT (J200) (see Figures 2 and 3).
The input can be a test signal or music source. A dual RCA cable is provided with female 100mil
connectors that mate with J100 and J200.
Output Connections
There are two output connectors on the reference board for the speaker outputs. Channel 1 output and
associated Power Ground 1 is located at J101. Channel 2 output and associated Power Ground 2 is
located at J201. A two-wire harness for each output is provided. See Table 2 for the output connector
wire colors. The TA3020 can be operated as a two-channel single-ended amplifier, bridged mono output
amplifier (see Figure 9) or with a passive crossover for a 2.1 channel application (refer to Application Note
13). Outputs can be any passive speaker(s) or test measurement equipment with resistive load (see
Application Note 4 for more information on bench testing).
Connector Name Output Ground
J101 White Blue
J201 Red Black
Table 2
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 discussion 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, assuming the mute is asserted before the supplies start to
discharge.
HMUTE
There is an LED, D1, which will illuminate if a fault condition is reported. HMUTE, pin 15, will illuminate
D1 via R2, if the processor detects an over or under voltage fault, as well as an over current fault. In
addition, if MUTE is high (by removing jumper on J4), the LED will also be illuminated.
An over/under voltage fault will automatically reset (and D1 will turn off) once the supply voltage is
brought back into specification. If an over current condition occurs, cycle the MUTE pin (by removing the
jumper on J4 and then replacing it). Assuming all supplies are still within specification, the HMUTE LED
will be off and the TA3020 reference board will again amplify input signals.
3 RB-TA3020, Rev. 3.0/03.02
Tripath Technology, Inc. - Technical Information
RB-TA3020 Board
Power In:
VPP (yel)
PGND (blu)
VNN (org)
VN10 (grn)
Channel 1
Output & Ground
Channel 1
Input & AGND
Channel 1
Offset
AGND (blk)
V5 (red)
Channel 2
Offset
Break Before Make
Jumpers
Mute
Jumper
Channel 2
Output & Ground
Output
Transistors
Figure 2
Channel 2
Input & AGND
HMute
LED
M100
M200
HEATSINK
PGND
VNN
VN10
VPP
OUT1
GND1
Offset
Ch1
AGND
IN1
V5
AGND
HMUTE LED
AGND
IN2
Offset
Ch2
GND2
OUT2
TA3020
BBM1
MUTE
BBM0
M101
M201
-+-+
-+
10V
AUDIO
SOURCE
28V (-1 VERSION)
45V (-2 VERSION)
28V (-1 VERSION)
45V (-2 VERSION)
Figure 3
4 RB-TA3020, Rev. 3.0/03.02
Tripath Technology, Inc. - Technical Information
ARCHITECTURE
block diagram of one channel of the reference board is shown in Figure 4. The major functional blocks
A3020 Amplifier Gain
he TA3020 amplifier gain is the product of the input stage gain and the modulator gain.
A
of the amplifier are described below.
Figure 4
TA3020 Output
Section
Out
Input Stage
In
Note: The TA3020 is an inverting amplifier.
T
T
AVTA3020 = AVINPUTSTAGE * AVMODULATOR
+
∗
×1
RRR FBBFBAI
VTA3020
()
−≈ +∗ RRRR FBBFBAFBCF
A
For the RB-TA3020-2 board;
R
I (R100, R200) = 49.9kΩ
kΩ
kΩ
Ω
RF (R101, R201) = 20
RFBA (R105, R205) = 1kΩ
R
FBB (R110, R210) = 1.07
R
FBC (R106, R206) = 13.3k
)
VV71.101
k07.1k1
k07.
49.9k
VTA3020 =
+
Ω∗Ω
Ω
Ω
(
1k1k3.13k20
ΩΩ
×
Ω
−≈ +∗
A
p Stage
igure 5 shows one channel of the Input Stage. The TA3020 amplifier is designed to accept unbalanced
e RB-TA3020-1, the gain is 6.4, or approximately 16 dB. For the RB-TA3020-2, the gain is
In ut
F
inputs. For th
10.8, or approximately 20.7 dB. Please note that the input stage of the TA3020 is biased at
approximately 2.5VDC. Therefore, for an input signal centered around ground (0VDC), the polarity of the
coupling capacitor, CIN, shown in Figure 5 is correct.
5 RB-TA3020, Rev. 3.0/03.02
Tripath Technology, Inc. - Technical Information
V5
1M
Ω
10K
Ω
0.1uF, 50V
1M
Ω
49.9K
Ω 2.2uF, 50V
Input to TA3020
R
IN C
IN
+
(DC Bias ~2.5V)
Figure 5
The value of the input capacitor, CIN, in Figure 5 (labeled C100 and C200 on the schematic), and the input
resistor, RIN (labeled R100 and R200), set the –3dB point of the input high-pass filter. The frequency of
the input high pass pole, FP, –3dB point can be calculated as follows:
FP = 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. R104 is used to adjust the offset of CH1, and R204 is used to adjust the
offset of CH2. If a different TA3020 is placed in the RB-TA3020 reference board, the offset of each
channel will need to be re-trimmed.
RB-TA3020 Control Circuitry
The MUTE pin is brought out to an external 2-pin header, J4 (Figure 6). When a jumper is installed from
Pin 1 to 2 of J4, 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
J2
J3
22
23
OCR2
OCR1
R111
ROCR
33
C103
R211
31
C203
MUTE 24
AGND
J4
Figure 6
6 RB-TA3020, Rev. 3.0/03.02
Tripath Technology, Inc. - Technical Information
The resistors, ROCR in Figure 6 (labeled R111 and R211 in the schematic), set the overcurrent 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 on this reference board is pre-set to 20KΩ for a 4Ω single-ended application. For lower impedance
applications (i.e. 4Ω bridged), this board’s overcurrent may trip prematurely. This is indicated by the
amplifier going into mute; to clear, 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 if
set too low of a value, this may result in an overcurrent threshold that is so high the amplifier will try to
drive a short circuit, possibly damaging the output FETs.
Finally, the Break-Before-Make (or “BBM”) lines are used to control the “dead time” of the output FETs.
The “dead time” is the period of time between the turn-off of one device and the turn-on of 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, different operating voltages, different layouts
and different performance requirements. For this reason, Tripath has provided a means to adjust the
BBM0 setting, via jumper J2, on the 3-pin header (see Figure 6). Please note that BBM1 is hardwired to
“0” on the RB-TA3020 since operating the reference board with BBM delays of 40nS or less will result in
significant shoot through current and possible MOSFET destruction.
These settings should be verified over the full temperature and load range of the application to ensure
that any thermal rise of the output FETs and TA3020 does not impact the performance of the amplifier.
This amplifier board is set to 80nS, and the table below shows the BBM values for various settings of the
jumpers (Figure 7).
B
M1
B
M0 Delay
1) 0 0 120nS
2) 0 1 80nS
3) 1 0 40nS
4) 1 1 0nS
1
1
Note: The default delay jumper setting is 80nS.
BB BBM
J2 J3
0 0
M0 1
Figure 7
7 RB-TA3020, Rev. 3.0/03.02
Tripath Technology, Inc. - Technical Information
Output Section
The output section includes the gate resistors, output diodes, FETs, output filters, the previously
mentioned OVERCURRENT sense resistors, clamping diodes, a Zobel Network, and various bypass
capacitors.
(labeled R113, R213, R114, and R214 in Figure 8 and the attached schematic) are
he output FETs (M100, M101, M200 and M201) provide the switching function required of a Class-T
he bypass capacitors C105/C205 and C113/c213 are critical to the reduction of ringing on the outputs of
he output diodes D106/D107/D206/D207 are also critical to the reduction of ringing on the outputs of the
he output filters L100/C108 and L200/C208 are the low-pass filters that recover the analog audio signal.
lower order (simpler and less costly).
R113/213
5.6 Ω
R114/214
5.6 Ω
LO
M101/201
HOCOM
FBKOUT
M100/200
HO
C105/205
0.1uF, 250V C106/206
0.1uF, 100V
C108/208
0.22uF, 100V
C110/210
0.1uF, 100V
C6
330uF, 63V
R116/216
0.01 Ω
R115/215
0.01 Ω
L100/200
11.3uH
C7
330uF, 63V
C109/209
0.1uF, 100V
R117/217
33 Ω/2W
OCSHPOCSHN
OCSLN
OCSLP
VNN
OUT
VPP
+
+
LOCOM
C113/223
33uF, 160V
D106/206
MUR120
D107/207
MUR120
Figure 8
The gate resistors
used to control MOSFET switching rise/fall times and thereby minimize voltage overshoots. They also
dissipate a portion of the power resulting 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 resulting in longer rise/fall times and thus requiring a larger BBM setting. Tripath
recommends using an RG of 5.6Ω when the Qg is greater than 70nC and RG of 10Ω when the gate charge
(Qg) of the output FET is less than 70nC.
T
design. They are driven directly by the TA3020 through the gate resistors. The devices used on the
reference board are ST 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”.
T
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.
T
FETs. They shunt the inductive energy if the output exceeds VPP or goes below VNN. The proper
connection of these diodes are “drain to drain” and “source to source” as shown in the schematic
diagrams.
T
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
8 RB-TA3020, Rev. 3.0/03.02
Tripath Technology, Inc. - Technical Information
The OEM may benefit from some experimentation in the filter design, but the values provided in the
ference design, 11.3uH and 0.22uF (nominal resonant frequency of 101kHz), provide excellent results
s, the material used in the core is important to the performance of
e filter. Core materials that saturates too easily will not provide acceptable distortion or efficiency
e an amplifier is powered up with no load
ttached. The Q of the LC output filter, with no load attached, rises quickly out to 80kHz. Resonant
g on the outputs of the FETs.
hese parts are placed as closely as possible to the leads of the FETs, and the leads of the capacitors
he amplifier is connected to the power supplies and load as shown in Figure 9. Note that an inverter
(i.e. Channel 2). The main reason for processing the
test bridged mode
peration. If the evaluation setup does not provide two out of phase signals, there is another way to
. The input signal is still
pplied to (J100) and is inverted on chip thus providing the input signal for Channel 2 via J200. If the gain
re
for most loads between 4Ω and 8Ω.
As important as the values themselve
th
figures. Tripath recommends a low-mu core, like type 2, iron powder cores. Micrometals,
(www.micrometals.com), is a main supplier of iron powder cores. The core part number used on the RB-
TA3020 is T106-2 and is wound with 29 turns of 16AWG wire.
The Zobel circuits R117/C109 and R217/C209 are there in cas
a
currents 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 should not require a recalculation of the Zobel value, though depending on application, the
power capability of R117 and R217 may need to be increased to 5W from 2W. The components used on
the reference board should be quite adequate for almost all applications.
The bypass capacitors C105/C205 are critical to the reduction of ringin
T
themselves are as short as practical. Their values will not change with different output FETs.
Connection Diagram for Bridge Mode Operation
T
has been added in front of one of the channel inputs
channels out of phase is to avoid potential problems with switching power supplies, but it also simplifies
the connections for bridged-mode operation. For bridged operation, simply connect the “-“ terminal to the
output of the inverted channel* (Channel 1 output, J101 pin 1) and the “+” terminal to the output of the
non-inverted channel with respect to the input signal (Channel 2 output, J201 pin 2).
The connection shown in Figure 9 is the easiest way to use the RB-TA3020 to
o
evaluate bridge mode operation. This requires the RB-TA3020 to be modified.
Change R201 to 20KΩ from 49.9KΩ. Connect Pin 26 (OAOUT1) to IN2 on J200
a
of the system needs to be modified, R101 can be adjusted. R201 should be left at 20KΩ. If stereo
operation is again desired, then the value of R101 and R201 must be made the same to ensure nominal
gain for both channels. Additionally, the connection between Pin 26 and IN2 on J200 should be removed.
9 RB-TA3020, Rev. 3.0/03.02
Tripath Technology, Inc. - Technical Information
M100
M200
HEATSINK
PGND
VNN
VN10
VPP
OUT1
GND1
Offset
Ch1
AGND
IN1
V5
AGND
AGND
IN2
Offset
Ch2
GND2
OUT2
TA3020
BBM1
MUTE
BBM0
M101
M201
-+-+
-+
10V
28V (-1 VERSION)
45V (-2 VERSION)
28V (-1 VERSION)
45V (-2 VERSION)
+
-
AUDIO
SOURCE
HMUTE LED
Figure 9
Circuit Board Layout
The TA3020 is a power (high current) amplifier that operates at relatively high switching frequencies.
The output of the amplifier switches between VPP and VNN at high speeds while driving large
currents. This high-frequency digital signal is passed through an LC low-pass filter to recover the
amplified audio signal. Since the amplifier must drive the inductive LC output filter and speaker loads,
the amplifier outputs can be pulled above the supply voltage and below ground by the energy in the
output inductance. To avoid subjecting the TA3020 to potentially damaging voltage stress, it is critical
to have a good printed circuit board layout. It is recommended that Tripath’s layout and application
circuit be used for all applications and only be deviated from after careful analysis of the effects of any
changes. Please refer to the TA3020 evaluation board document, EB-TA3020, available on the
Tripath website, at www.tripath.com.
The following components are important to place near either their associated TA3020 or output
MOSFET pins. The recommendations are ranked in order of layout importance, either for proper
device operation or performance considerations. The component designators, referred to, are for
channel 1 of the RB-TA3020.
- The capacitors, CHBR (C105/C113), provide high frequency bypassing of the amplifier power
supplies and will serve to reduce spikes across the supply rails. Please note that both
mosfet half-bridges must be decoupled separately. In addition, the voltage rating for CHBR
should be at least 150V as this capacitor is exposed to the full supply range, VPP-VNN.
- DO (D106/D107) are also critical to the reduction of ringing on the outputs of the FETs.
They shunt the inductive energy if the output exceeds VPP or goes below VNN. The
proper connection of these diodes are “drain to drain” and “source to source” as shown in
the schematic diagrams. These diodes have a 200V rating.
- CFB (C107) removes very high frequency components from the amplifier feedback signals
and lowers the output switching frequency by delaying the feedback signals. In addition,
the value of CFB is different for channel 1 and channel 2 to keep the average switching
frequency difference greater than 40kHz. This minimizes in-band audio noise. Locate
these capacitors as close to their respective TA3020 pin as possible.
10 RB-TA3020, Rev. 3.0/03.02
Tripath Technology, Inc. - Technical Information
- To minimize noise pickup and minimize THD+N, RFBC (R106/R109) should be located as
close to the TA3020 as possible. Make sure that the routing of the high voltage feedback
lines is kept far away from the input op amps or significant noise coupling may occur. It is
best to shield the high voltage feedback lines by using a ground plane around these traces
as well as the input section.
- CB (C111), CSW (C5) provides high frequency bypassing for the VN10 and bootstrap
supplies. Very high currents are present on these supplies.
In general, to enable placement as close to the TA3020, and minimize PCB parasitics, the capacitors
CFB, CB and CSW should be surface mount types, located on the “solder” side of the board.
Some components are not sensitive to location but are very sensitive to layout and trace routing.
- To maximize the damping factor and reduce distortion and noise, the modulator feedback
connections should be routed directly to the pins of the output inductors. LO (L100).
- The output filter capacitor, CO (C108), and zobel capacitor, CZ (C109), should be star
connected with the load return. The output ground feedback signal should be taken from
this star point.
- The modulator feedback resistors, RFBA (R105/R108) and RFBB (R107/R110), should all be
grounded and attached to 5V together. These connections will serve to minimize common
mode noise via the differential feedback.
- The feedback signals that come directly from the output inductors are high voltage and high
frequency in nature. If they are routed close to the input nodes, INV1 and INV2, the high
impedance inverting opamp pins will pick up noise. This coupling will result in significant
background noise, especially when the input is AC coupled to ground, or an external
source such as a CD player or signal generator is connected. Thus, care should be taken
such that the feedback lines are not routed near any of the input section.
- To minimize the possibility of any noise pickup, the trace lengths of INV1 and INV2 should
be kept as short as possible. This is most easily accomplished by locating the input
resistors, RI (R100), and the input stage feedback resistors, RF (R101), as close to the
TA3020 as possible. In addition, the offset trim resistor, ROFB (R103), which connects to
either INV1, or INV2, should be located close to the TA3020 input section.
Performing Measurements on the EB-TA3020
The TA3020 operates by generating a high frequency switching signal based on the audio input. This
signal is sent through a low-pass filter that recovers an amplified version of the audio input. The
frequency of the switching pattern is spread spectrum in nature and typically varies between 100kHz and
1MHz, which is well above the 20Hz – 20kHz audio band. The pattern itself does not alter or distort the
audio input signal, but it does introduce some inaudible components.
The measurements of certain performance parameters, particularly noise related specifications such as
THD+N, are significantly affected by the design of the low-pass filter used on the output as well as the
bandwidth setting of the measurement instrument used. Unless the filter has a very sharp roll-off just
beyond the audio band or the bandwidth of the measurement instrument is limited, some of the inaudible
noise components introduced by the TA3020 amplifier switching pattern will degrade the measurement.
One feature of the TA3020 is that it does not require large multi-pole filters to achieve excellent
performance in listening tests, usually a more critical factor than performance measurements. Though
using a multi-pole filter may remove high-frequency noise and improve THD+N type measurements
11 RB-TA3020, Rev. 3.0/03.02
Tripath Technology, Inc. - Technical Information
12 RB-TA3020, Rev. 3.0/03.02
(when they are made with wide-bandwidth measuring equipment), these same filters degrade frequency
response. The RB-TA3020 Reference Board has a simple two-pole output filter with excellent
performance in listening tests.
(See Application Note 4 for more information on bench testing)
Revision Changes
Revision 3.0 – Added capacitors C113 & C213 in Bill of Materials, Schematics, and Layout. Added gate
diodes and output diodes to design.
Documentation
Soft copies of the schematics and layout can be provided upon request (available in Protel format).
Gerber files are also available.
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
A
B
C
D
4
321
D
C
B
A
Title
Number RevisionSize
C
Date: 26-Mar-2002 Sheet of
File: C:\WINDOWS\..\2139R301.SCH Drawn By:
R104
10K POT
J4
R201
20K,1%
C201
33pF
IN2
R101
20K,1%
C101
33pF
IN1
R200
49.9K,1%
R100
49.9K,1%
C1
0.1uF
C3
0.1uF
C4
0.1uF
AGND
AGND
R1
8.25K, 1%AGND
AGND
R205
1K, 1%
R207
1.13K, 1%
R206
8.25K, 1%
V5
R208
1K, 1%
R210
1.13K, 1%
R209
8.25K, 1%
AGND
R108
1K, 1%
R110
1.13K, 1%
R109
8.25K, 1%
AGND
R105
1K, 1%
R107
1.13K, 1%
R106
8.25K, 1%
V5
OCRNT1OCRNT2
R111
20K,1%
C103
220pF
AGND
R211
20K,1%
C203
220pF
AGND
OCRNT1
OCRNT2
R102
510K, 5%
R103
510K, 5%
C102
0.1uF
AGND
V5
R204
10K POT
R202
510K, 5%
R203
510K, 5%
C202
0.1uF
AGND
V5 IN2 IN1
C200
2.2uF
C100
2.2uF
AGND
AGND
R4
249K, 1%
R5
750M, 1% R6
267K, 1%
R7
267K, 1%
V5
V5
V5
FN1
FN2
FP1
FP2
FB1
PGND2
FB2
VPP
VSS
VSS
M101
STW34NB20
M100
STW34NB20
C106
0.1uF/250V
C110
0.1uF/250V
C105
0.1uF/250V
C6
330uF/63V
1 2
L100
11uH
C109
0.1uF/100V
C108
0.22uF/100V
R117
20OHM/5W
R113
5.6OHM/1W
R114
5.6OHM/1W
R115
0.01OHM/2W
R116
0.01OHM/2W VSS
VPP
AMPOUT1
PGND1
M201
STW34NB20
M200
STW34NB20
C206
0.1uF/250V
C210
0.1uF/250V
C205
0.1uF/250V
C7
330uF/63V
12
L200
11uH
C209
0.1uF/100V
C208
0.22uF/100V
R217
20OHM/5W
R213
5.6OHM/1W
R214
5.6OHM/1W
R215
0.01OHM/2W
R216
0.01OHM/2W
VSS
VPP
AMPOUT2
PGND2
C204
47uF/25V
D202
MURS120T3
C104
47uF/25V
D102
MURS120T3
R3
1K, 1%
V5
EB-TA3020-2 BOARD - NOMINAL SUPPLY +/-21V - +/-39V
J3
J2
1
2
3
4
J5
J201 J101
AMPOUT1
PGND1
AMPOUT2
PGND2
C5
0.1uF
VSS
AMP OUTPUT 2 AMP OUTPUT 1
J1 V5
AGND
VSS
VSS+10
VPP
VSS+10
FB2
FB1
J200
J100
CON2INPT
AGND
AGND
5V INPUT CONNECTOR
POWER SUPPLY CONNECTOR
BBM1
BBM0
MUTE
CH 2 OFFSET TRIM CH 1 OFFSET TRIM
BBM 1 SET TO 0V
BBM 0 SET TO 5V
REMOVE J4 SHUNT TO ENABLE MUTE
C8
47uF/25V
1 2
L1
FBEAD
PGND1
C212
0.1uF
C112
0.1uF
AGND
AGND
AGND
C107
150pF
C207
270pF
SCH REV. 3.01
R219
510K, 5%
R218
510K, 5%
R118
510K, 5%
R119
510K, 5%
R220
WIRE
R221
WIRE
R121
WIRE
R120
WIRE
D103
MURS120T3
D203
MURS120T3
D204
MUR120
D205
MUR120
D104
MUR120
D105
MUR120
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
R212
240 OHM, 5%
C211
0.1uF
R112
240 OHM, 5%
C111
0.1uF
AGND
R2
2K, 5%
D1
LED
AGND
D106
MUR120
D107
MUR120
NOTE:
D106, D107, D206, D207 ARE MUR120
DIODES SOLDERED DIRECTLY TO FET
LEADS ON BOTTOM OF BOARD
C113 AND C213 ARE SOLDERED DIRECTLY
TO FET LEADS ON BOTTOM OF BOARD
D206
MUR120
D207
MUR120
C113
33uF/160V
C213
33uF/160V
BOARD REVISION 3.0
C:\WINDOWS\DESKTOP\LAYOUT~1\TA3020\REV3_0\2139R301.BOM 10:43:25 26-Mar-2002
Bill of Material for C:\WINDOWS\DESKTOP\LAYOUT~1\TA3020\REV3_0\2139R301.Sch
Used Part Type Designator Footprint Part Field 1 Part Field 2 Part Field 3
==== =========== ==================== =========== ===================== ============ ===============
4 0.01OHM/2W R115 R116 R215 R216 RLVR1RG2 OHMITE 12FR010 DK 12FR010-ND
10 0.1uF C1 C102 C111 C112 0805 20% TOL. * *
C202 C211 C212 C3 C4
C5
2 0.1uF/100V C109 C209 C0U1MF10 PANASONIC ECH-S1104JZ DK PS1104J-ND
6 0.1uF/250V C105 C106 C110 C205 C0U1MF10 PANASONIC ECQ-E2104KF DK EF2104-ND
C206 C210
2 0.22uF/100V C108 C208 C0U22MF10 PANASONIC ECH-S1224JZ DK PS1224J-ND
4 1.13K, 1% R107 R110 R207 R210 0805 * * *
2 10K POT R104 R204 POTSTURN BOURNS 3306P-1-103 DK 3306P-103-ND
2 11uH L100 L200 T106 COIL WINDING SPEC T106-2 CORE 29TURNS / 16AWG
1 150pF C107 0805 NPO 5% * *
5 1K, 1% R105 R108 R205 R208 0805 * * *
R3
2 2.2uF C100 C200 C10UEL05 PANASONIC ECA-1HHG2R2 DK P5564-ND
4 20K,1% R101 R111 R201 R211 0805 * * *
2 20OHM/5W R117 R217 R33R3W XICON ERG-2SJ330 MSR 280-PRM5-20
2 220pF C103 C203 0805 NPO 5% * *
2 240 OHM, 5% R112 R212 0805 * * *
1 249K, 1% R4 0805 * * *
2 267K, 1% R6 R7 0805 * * *
1 270pF C207 0805 NPO 5% * *
1 2K, 5% R2 0805
2 330uF/63V C6 C7 C100UEL06 PANASONIC EEU-FC1J331 DK P10349-ND
2 33pF C101 C201 0805 NPO 5% * *
2 33uF/160V C113 C213 C100UEL06 PANASONIC EEU-EB2C330 DK P5901-ND
3 47uF/25V C104 C204 C8 C10UEL05 PANASONIC ECA-1EHG470 DK P5539-ND
2 49.9K,1% R100 R200 0805 * * *
4 5.6OHM/1W R113 R114 R213 R214 RES1WFLT PANASONIC ERG-1SJ5R6 P5.6W-1BK-ND
8 510K, 5% R102 R103 R118 R119 0805 * * *
R202 R203 R218 R219
1 750M, 1% R5 0805 * * *
5 8.25K, 1% R1 R106 R109 R206 0805 * * *
R209
2 CON2 J101 J201 PWR2 WALDOM 26-60-4020 DK WM4620-ND
2 CON2INPT J100 J200 CON2 WALDOM 705-43-0001 DK WM4800-ND
1 CON2LPWR J1 CON2B WALDOM 22-23-2021 DK WM4200-ND
1 CON4 J5 PWR4 WALDOM 26-60-4040 DK WM4622-ND
1 FBEAD L1 2512 * * *
1 HDR2 J4 GJMPR001 * * *
2 HDR3 J2 J3 GJMP3001 * * *
1 LED D1 LED1 RED LED * *
8 MUR120 D104 D105 D106 D107 DIODE60 ON SEMICONDUCTOR MUR120 *
D204 D205 D206 D207
4 MURS120T3 D102 D103 D202 D203 SMB ON SEMICONDUCTOR MURS120T3 *
4 STW34NB20 M100 M101 M200 M201 TO3P&220RGT ST MICROELECTRONICS * *
1 TA3020 I1 DIP48 TRIPATH * *
4 WIRE R120 R121 R220 R221 RES1WFLT 22AWG SOLID CORE WIRE
4 ALUMINUM OXIDE ISOLATING WASHER AAVID THERMALLOY 4170
1 2 3 4
A
B
C
D
4
321
D
C
B
A
Title
Number RevisionSize
C
Date: 26-Mar-2002 Sheet of
File: C:\WINDOWS\..\3560R301.SCH Drawn By:
R104
10K POT
J4
R201
20K,1%
C201
33pF
IN2
R101
20K,1%
C101
33pF
IN1
R200
49.9K,1%
R100
49.9K,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
13.3K, 1%
V5
R208
1K, 1%
R210
1.07K, 1%
R209
13.3K, 1%
AGND
R108
1K, 1%
R110
1.07K, 1%
R109
13.3K, 1%
AGND
R105
1K, 1%
R107
1.07K, 1%
R106
13.3K, 1%
V5
OCRNT1OCRNT2
R111
20K,1%
C103
220pF
AGND
R211
20K,1%
C203
220pF
AGND
OCRNT1
OCRNT2
R102
510K, 5%
R103
510K, 5%
C102
0.1uF
AGND
V5
R204
10K POT
R202
510K, 5%
R203
510K, 5%
C202
0.1uF
AGND
V5 IN2 IN1
C200
2.2uF
C100
2.2uF
AGND
AGND
R4
392K, 1%
R5
1.18M, 1% R6
422K, 1%
R7
422K, 1%
V5
V5
V5
FN1
FN2
FP1
FP2
FB1
PGND2
FB2
VPP
VSS
VSS
M101
STW34NB20
M100
STW34NB20
C106
0.1uF/250V
C110
0.1uF/250V
C105
0.1uF/250V
C6
330uF/63V
1 2
L100
11uH
C109
0.1uF/100V
C108
0.22uF/100V
R117
20OHM/5W
R113
5.6OHM/1W
R114
5.6OHM/1W
R115
0.01OHM/2W
R116
0.01OHM/2W VSS
VPP
AMPOUT1
PGND1
M201
STW34NB20
M200
STW34NB20
C206
0.1uF/250V
C210
0.1uF/250V
C205
0.1uF/250V
C7
330uF/63V
12
L200
11uH
C209
0.1uF/100V
C208
0.22uF/100V
R217
20OHM/5W
R213
5.6OHM/1W
R214
5.6OHM/1W
R215
0.01OHM/2W
R216
0.01OHM/2W
VSS
VPP
AMPOUT2
PGND2
C204
47uF/25V
D202
MURS120T3
C104
47uF/25V
D102
MURS120T3
R3
1K, 1%
V5
EB-TA3020-2 BOARD - NOMINAL SUPPLY +/-35V - +/-60V
J3
J2
1
2
3
4
J5
J201 J101
AMPOUT1
PGND1
AMPOUT2
PGND2
C5
0.1uF
VSS
AMP OUTPUT 2 AMP OUTPUT 1
J1 V5
AGND
VSS
VSS+10
VPP
VSS+10
FB2
FB1
J200
J100
CON2INPT
AGND
AGND
5V INPUT CONNECTOR
POWER SUPPLY CONNECTOR
BBM1
BBM0
MUTE
CH 2 OFFSET TRIM CH 1 OFFSET TRIM
BBM 1 SET TO 0V
BBM 0 SET TO 5V
REMOVE J4 SHUNT TO ENABLE MUTE
C8
47uF/25V
1 2
L1
FBEAD
PGND1
C212
0.1uF
C112
0.1uF
AGND
AGND
AGND
C107
150pF
C207
270pF
SCH REV. 3.01
R219
510K, 5%
R218
510K, 5%
R118
510K, 5%
R119
510K, 5%
R220
WIRE
R221
WIRE
R121
WIRE
R120
WIRE
D103
MURS120T3
D203
MURS120T3
D204
MUR120
D205
MUR120
D104
MUR120
D105
MUR120
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
R212
240 OHM, 5%
C211
0.1uF
R112
240 OHM, 5%
C111
0.1uF
AGND
R2
2K, 5%
D1
LED
AGND
D106
MUR120
D107
MUR120
NOTE:
D106, D107, D206, D207 ARE MUR120
DIODES SOLDERED DIRECTLY TO FET
LEADS ON BOTTOM OF BOARD
C113 AND C213 ARE SOLDERED DIRECTLY
TO FET LEADS ON BOTTOM OF BOARD
D206
MUR120
D207
MUR120
C113
33uF/160V
C213
33uF/160V
BOARD REVISION 3.0
C:\WINDOWS\DESKTOP\LAYOUT~1\TA3020\REV3_0\3560R301.BOM 10:44:13 26-Mar-2002
Bill of Material for C:\WINDOWS\DESKTOP\LAYOUT~1\TA3020\REV3_0\3560R301.Sch
Used Part Type Designator Footprint Part Field 1 Part Field 2 Part Field 3
==== =========== ==================== =========== ===================== ============ ===============
4 0.01OHM/2W R115 R116 R215 R216 RLVR1RG2 OHMITE 12FR010 DK 12FR010-ND
10 0.1uF C1 C102 C111 C112 0805 20% TOL. * *
C202 C211 C212 C3 C4
C5
2 0.1uF/100V C109 C209 C0U1MF10 PANASONIC ECH-S1104JZ DK PS1104J-ND
6 0.1uF/250V C105 C106 C110 C205 C0U1MF10 PANASONIC ECQ-E2104KF DK EF2104-ND
C206 C210
2 0.22uF/100V C108 C208 C0U22MF10 PANASONIC ECH-S1224JZ DK PS1224J-ND
4 1.07K, 1% R107 R110 R207 R210 0805 * * *
1 1.18M, 1% R5 0805 * * *
2 10K POT R104 R204 POTSTURN BOURNS 3306P-1-103 DK 3306P-103-ND
2 11uH L100 L200 T106 COIL WINDING SPEC T106-2 CORE 29TURNS / 16AWG
4 13.3K, 1% R106 R109 R206 R209 0805 * * *
1 150pF C107 0805 NPO 5% * *
5 1K, 1% R105 R108 R205 R208 0805 * * *
R3
2 2.2uF C100 C200 C10UEL05 PANASONIC ECA-1HHG2R2 DK P5564-ND
4 20K,1% R101 R111 R201 R211 0805 * * *
2 20OHM/5W R117 R217 R33R3W XICON ERG-2SJ330 MSR 280-PRM5-20
2 220pF C103 C203 0805 NPO 5% * *
2 240 OHM, 5% R112 R212 0805 * * *
1 270pF C207 0805 NPO 5% * *
1 2K, 5% R2 0805
2 330uF/63V C6 C7 C100UEL06 PANASONIC EEU-FC1J331 DK P10349-ND
2 33pF C101 C201 0805 NPO 5% * *
2 33uF/160V C113 C213 C100UEL06 PANASONIC EEU-EB2C330 DK P5901-ND
1 392K, 1% R4 0805 * * *
2 422K, 1% R6 R7 0805 * * *
3 47uF/25V C104 C204 C8 C10UEL05 PANASONIC ECA-1EHG470 DK P5539-ND
2 49.9K,1% R100 R200 0805 * * *
4 5.6OHM/1W R113 R114 R213 R214 RES1WFLT PANASONIC ERG-1SJ5R6 P5.6W-1BK-ND
8 510K, 5% R102 R103 R118 R119 0805 * * *
R202 R203 R218 R219
1 8.25K, 1% R1 0805 * * *
2 CON2 J101 J201 PWR2 WALDOM 26-60-4020 DK WM4620-ND
2 CON2INPT J100 J200 CON2 WALDOM 705-43-0001 DK WM4800-ND
1 CON2LPWR J1 CON2B WALDOM 22-23-2021 DK WM4200-ND
1 CON4 J5 PWR4 WALDOM 26-60-4040 DK WM4622-ND
1 FBEAD L1 2512 * * *
1 HDR2 J4 GJMPR001 * * *
2 HDR3 J2 J3 GJMP3001 * * *
1 LED D1 LED1 RED LED * *
8 MUR120 D104 D105 D106 D107 DIODE60 MOTOROLA MUR120 *
D204 D205 D206 D207
4 MURS120T3 D102 D103 D202 D203 SMB MOTOROLA MURS120T3 *
4 STW34NB20 M100 M101 M200 M201 TO3P&220RGT ST MICROELECTRONICS * *
1 TA3020 I1 DIP48 TRIPATH * *
4 WIRE R120 R121 R220 R221 RES1WFLT 22AWG SOLID CORE WIRE
4 ALUMINUM OXIDE ISOLATING WASHER AAVID THERMALLOY 4170
