DESCRIPTION
The LCM-120™ line conditioning module is a non-isolated dc-dc
converter used to extend the input voltage range of Interpoint’s
dc-dc converters. The LCM-120 delivers up to 120 watts of
throughput power from a 12 to 50 volt dc source in one of three
modes:
• 12 to 24 volts input – internal boost converter
delivers 24 V
• 24 to 36 volts input – input is connected
directly to output
• 36 to 50 volts input – internal buck converter
delivers 36 V
Converter Design
The LCM-120 module is protected by internal current limit
circuitry which limits current according to input voltage. This
feature also allows safe charging of large external capacitors.
Because current is sensed between input common and output
common there is normally no external connection made between
these pins. (Note: If an external connection between input
and output common is desired, the resistance of this external
connection must be greater than 1 ohm.) The LCM module will
work through up to an 80 volt transient for up to 120 milliseconds
while holding the output at 36 VDC.
Features
Features include an under voltage lockout, an inhibit input, a
synchronization input and a power fail flag output. Under voltage
lockout prevents start-up for inputs less than 12 volts dc and will
shut down the converter for an input of less than 10 volts dc. The
inhibit input, when connected to input common, disables the
internal converter and opens the output power path while leaving
the power fail flag unaffected. Inhibit is normally left open or
pulled up with a resistor. The sync input allows synchronization of
the LCM-120 module’s internal clock to an external pulse source
with LSTTL level voltages and a 40% to 60% duty cycle. When
unused, the sync should be left unconnected. The power fail flag
output is a fully isolated NPN opto-coupler transistor rated to 18
volts dc. It will drive an external LSTTL load low if the LCM-120
module’s input voltage drops below 10 volts dc and will remain
active until the module output voltage also drops below 10 volts
dc.
Low vin anD Heavy LoaDs
When the LCM-120 module is operated at 12 volts in and 120
watts output, line loss can become a major concern. The module
will output 24 volts at 120 watts. Allowing for efficiency, the input
current will be 120 watts / 0.88 / 12 = 11.36 A. If the resistance in
the line from the power source to the LCM-120 is 0.05 ohms, the
line loss at 12 volts from the power source will be (0.05 • 11.36)
= 0.57 volts. The LCM-120 module will see 11.43 volts and will
not start up.
externaL CapaCitanCe
Interpoint recommends a minimum output capacitance of 330 uF
and a total ESR of at least 0.25 ohms to ensure stability of the
LCM-120 module’s boost converter. For very low ESR capacitors,
an external series resistor (non-inductive) may be used to
obtain the minimum total ESR. The maximum recommended
capacitance is 1 F.
MODELS
VDC Output
LCM-120 24 to 36 VDC
Crane Aerospace & Electronics Power Solutions
LCM-120 Line Conditioning Module
Crane Aerospace & Electronics
Power Solutions – Interpoint Products
10301 Willows Rd. NE, Redmond, WA 98052
+1.425.882.3100 • power@crane-eg.com
www.craneae.com/interpoint
Page 1 of 7
LCM-120 Rev AA - 2013.06.14
28 Volt input – 120 watt
FEATURES
Powers dc-dc converters requiring 28 Vin
Input voltage 12 to 50 VDC
• Operating temperature -55° to +125°C
• Works through transients of
up to 80 V for up to 120 ms
• Inhibit function
• Synchronization function
• Undervoltage lockout
+
–
10 TO 50 VDC
RTN
PWM
CONTROLLER
LCM-120
EMI FILTER
MTR
28XXX
MSA
28XXX
RTN
(25W) (5W)
+24 TO +36 VDC
ENERGY STORAGE FOR
HOLDUP IF REQUIRED
DISTRIBUTED POWER TO SYSTEM INTERFACE
CH
6 F 6 F 6 F 6 F
0.01 Ω
Figure 1: system BLoCk Diagram
+36
+24
+10 +24 +36 +50
VIN (Volts)
VOUT ( Volts)
BOOST
NO CONTROL
BUCK
+80 / 120 ms,
~
~
~
~BUCK TRANSIENT
+12
Figure 2: output voLtage
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Crane Aerospace & Electronics Power Solutions
LCM-120 Line Conditioning Module
28 VOLT INPUT – 120 WATT
Page 2 of 7
LCM-120 Rev AA - 2013.06.14
Angled corner indicates pin one.
TOP VIEW
LCM-120
(Pin side, marked side)
1
2
3
4
5
6
12
11
10
9
8
7
See “Figure 5: Case U” on page 6 for dimensions.
Figure 3: pin out
PINS NOT IN USE
Inhibit Leave unconnected
“No Connection” pin Leave unconnected
Sync Leave unconnected
PIN OUT
Pin LCM-120
1Positive Input
2Positive Input
3Input Common
4Input Common
5Output Common
6Positive Output
7No Connection
8No Connection
9Power Fail Flag Return
10 Power Fail Flag Output
11 Inhibit
12 Sync
LCM – 120 / ES
Base Model
Output Power
Screening
(Standard screening has no
designator in this position.)
MODEL NUMBERING KEY
Note: There is only one LCM-120 model.
MODEL NUMBER OPTIONS
To deTermine The model number enTer one
opTion from each caTegory in The form
below.
CATEGORY Base Model Screening 1
OPTIONS LCM-120 (standard, leave blank)
ES
FILL IN FOR
MODEL # LCM-120
__________ /
Notes:
1. Screening: For standard screening leave the screening option blank.
For other screening options, insert the desired screening level. For more
information see “Table 6: Environmental Screening” on page 7.
taBLe 1: output voLtage
taBLe 2: pins not in use
taBLe 3: moDeL numBer options
Figure 4: moDeL numBering key
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Crane Aerospace & Electronics Power Solutions
LCM-120 Line Conditioning Module
28 VOLT INPUT – 120 WATT
Page 3 of 7
LCM-120 Rev AA - 2013.06.14
MODELS HEAD
PARAMETER CONDITIONS MIN TYP MAX UNITS
LEAD SOLDERING TEMPERATURE 110 seconds max. — — 300 °C
STORAGE TEMPERATURE 1-65 — +150 °C
CASE OPERATING FULL POWER -55 — +125 °C
TEMPERATURE 1 ABSOLUTE -55 — +135
DERATING OUTPUT POWER/CURRENT 1LINEARLY From 100% at 125°C to 0% at 135°C
ISOLATION, ANY PIN TO CASE
EXCEPT CASE PIN @ 500 VDC AT 25°C 100 — — Megohms
CONVERSION FREQUENCY
FREE RUN
-55° TO +125°C — 600 — kHz
SYNCHRONIZATION 1 INPUT FREQUENCY 550 — 600 kHz
DUTY CYCLE 40 — 60 %
ACTIVE LOW — — 0.8 VDC
ACTIVE HIGH 4.5 — –
REFERENCED TO INPUT COMMON
IF NOT USED LEAVE UNCONNECTED
INHIBIT ACTIVE LOW (OUTPUT DISABLED) INHIBIT PIN PULLED LOW 1— — 1.3 VDC
Do not apply a voltage to the inhibit pin REFERENCED TO INPUT COMMON
INHIBIT ACTIVE HIGH (OUTPUT ENABLED)
Do not apply a voltage to the inhibit pin INHIBIT PIN CONDITION OPEN COLLECTOR OR
UNCONNECTED
OPEN PIN VOLTAGE 1— 10 — V
taBLe 4: operating ConDitions 25°C Case, 28 vDC vin, unLess otHerwise speCiFieD.
Notes
1. Guaranteed by design. Not an in-line test.
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Crane Aerospace & Electronics Power Solutions
LCM-120 Line Conditioning Module
28 VOLT INPUT – 120 WATT
Page 4 of 7
LCM-120 Rev AA - 2013.06.14
taBLe 5: eLeCtriCaL CHaraCteristiCs: 25°C Case, 28 vDC vin, 100% LoaD, Free run, unLess otHerwise speCiFieD.
LINE CONDITIONING MODULE INPUT VOLTAGE LCM-120
PARAMETER CONDITIONS AS A CONDITION MIN TYP MAX UNITS
OUTPUT VOLTAGE 12 to 24 23 24 24.5
CONTINUOUS 24 to 36 VOUT = VIN - 1 V VDC
36 to 50 35 36 37.5
TRANSIENT 120 ms 1 50 to 80 — 36 —
OUTPUT POWER 1 12 to 50 — — 120 W
OUTPUT RIPPLE 1 FULL LOAD 12 to 24 — 150 —
BW = 10 kHz to 2 MHz 24 to 36 — 50 — mV p-p
36 to 50 — 1500 —
INPUT VOLTAGE CONTINUOUS 12 28 50 VDC
TRANSIENT 120 ms 1 — — 80 V
INPUT CURRENT NO LOAD 12 — 125 180
24 1 — 65 85
36 1 — 20 — mA
INHIBITED 1 12 — 50 —
PIN 11 = 0 V 24 — 24 —
36 — 18 —
INPUT RIPPLE 1 FULL LOAD — 150 — mA p-p
BW = 10 kHz to 10 MHz
EFFICIENCY 1 12 — 88 —
FULL LOAD 24 — 95 — %
36 — 90 —
INHIBIT PIN CURRENT 1 INHIBITED, PIN 11 = 0 V 12 to 80 — 1 — mA
POWER FAIL FLAG THRESHOLD 1 VOUT > 10, PIN 6
FLAG CURRENT = 0.4 mA < 9.5 —0.4, pin 10 — VDC
POWER FAIL THRESHOLD (V) VIN FALLING — 9.5 10 VDC
UNDERVOLTAGE LOCKOUT 1 VIN RISING — 11.5 12 VDC
OUTPUT CAPACITOR 1 ESR > 0.25 OHMS 330 — 1,000,000 µF
Notes
1. Guaranteed by design. Not an in-line test.
www.craneae.com/interpoint
Crane Aerospace & Electronics Power Solutions
LCM-120 Line Conditioning Module
28 VOLT INPUT – 120 WATT
Page 5 of 7
LCM-120 Rev AA - 2013.06.14
Angled corner
indicates pin one.
1
2
3
4
5
6
12
11
10
9
8
7
0.000
0.050 (1.27)
0.000
0.120 (3.05)
0.250 (6.35)
0.450 (11.43)
0.650 (16.51)
0.850 (21.59)
1.050 (26.67)
1.250 (31.75)
1.380 (35.05)
1.505 (38.23) max.
0.000
0.120 (3.05)
0.250 (6.35)
2.750 (69.85)
2.880 (73.15)
3.005 (76.33) max.
0.128 dia
(3.25).
0.040 dia
(1.02)
0.23 (5.8) Pin Length
0.400 (10.16) max.
0.220 (5.59
TOP VIEW CASE U*
Flanged case, short-leaded
Seam Seal
*
Does not require designator in Case Option position of model number.
Weight: 95 grams maximum
Case dimensions in inches (mm)
Tolerance ±0.005 (0.13) for three decimal places
±0.01 (0.3) for two decimal places
unless otherwise specified
CAUTION
Heat from reflow or wave soldering may damage the device. Solder pins
individually with heat application not exceeding 300°C for 10 seconds per pin.
Materials
Header Cold Rolled Steel/Nickel/Gold
Cover Kovar/Nickel
Pins #52 alloy/Gold ceramic seal
Gold plating of 50 - 150 microinches is included in pin diameter
Seal Hole: 0.120 ±0.002 (3.05 ±0.05)
Case U, Rev H, 2013.06.04
Please refer to the numerical dimensions for accuracy.
Figure 5: Case u
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Crane Aerospace & Electronics Power Solutions
LCM-120 Line Conditioning Module Cases
28 VOLT INPUT – 120 WATT
Page 6 of 7
LCM-120 Rev AA - 2013.06.14
STANDARD AND /ES (NON-QML) ENVIRONMENTAL SCREENING
1, 2
NON-QML
TEST PERFORMED STANDARD
/ES
Pre-cap Inspection
Method 2017, 2032 n n
Temperature Cycle (10 times)
Method 1010, Cond. B, -55°C to +125°C, ambient n
Constant Acceleration
Method 2001, 500 g n
Burn-in
Method 1015 3
96 hours n
Final Electrical Test MIL-PRF-38534, Group A
Subgroups 1 and 4: +25°C case n n
Hermeticity Test
Fine Leak, Method 1014, Cond. A n
Gross Leak, Method 1014, Cond. C n
Gross Leak, Dip n
Final visual inspection
Method 2009 n n
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
Notes:
1. “Non-QML” Refers to products that do not offer QML screening.
2. Standard and /ES, non-QML products, may not meet all of the requirements of MIL-PRF-38534.
3. Burn-in temperature designed to bring the case temperature to the maximum case temperature of the product. Refer to the specific
product information for the maximum case temperature. Burn-in is a powered test.
TABLE 7: ENVIRONMENTAL SCREENING–HIGH RELIABILITY STANDARD AND /ES, NON-QML
taBLe 6: environmentaL sCreening
Crane Aerospace & Electronics Power Solutions
LCM-120 Rev AA - 2013.06.14 This revision supersedes all previous releases. All technical information is believed to be accurate, but no
responsibility is assumed for errors or omissions. Crane Electronics, Inc reserves the right to make changes in products or specifications without
notice. Interpoint and LCM-120 are trademarks of Crane Electronics, Inc. Copyright © 1999-2013 Crane Electronics, Inc. All rights reserved.
www.craneae.com/interpoint Page 7 of 7
LCM-120 Line Conditioning Module
28 VOLT INPUT – 120 WATT
