DESCRIPTION

The LCM-120TM 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:

1. 12 to 24 volts input internal boost converter delivers 24 volts
2. 24 to 36 volts input input is connected directly to output
3. 36 to 50 volts input internal buck converter delivers 36 volts.

ONVERTER

ESIGN

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.

EATURES

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

converters 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.

IN AND

EAVY

OADS

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.

XTERNAL

APACITANCE

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
1F.

B6-9

LCM-120

120 WATT

EATURES

· _55°C to +125°C
· 12 to 50 VDC input
· Works through transients of

up to 80 V for up to 20 ms.

· Powers DC/DC converters

requiring 28 Vin nominal

· Undervoltage lockout
· Inhibit function
· Sync function

MODEL

LCM-120

Output 24

to 36 VDC

INE

ONDITIONING

ODULE

28 V

OLT

NPUT

Size (max.): 1.505 x 3.005 x 0.400 inches

(38.23 x 76.33 x 10.16 mm)
See Section B8, case U1, for dimensions.

Weight:

95 grams max.

Screening:

Standard or ES. See Section C2 for screening
options, see Section A5 for ordering information.

TYPICAL CHARACTERISTICS

SYNC AND INHIBIT

RECOMMENDED OPERATING CONDITIONS

ABSOLUTE MAXIMUM RATINGS

B6-10

LCM-120
120 WATT

INE

ONDITIONING

ODULE

INPUT VOLTAGE

LCM-120

PARAMETERS

CONDITIONS

AS A CONDITION

MIN

TYP

MAX

UNITS

OUTPUT VOLTAGE

12 TO 24

24.5

CONTINUOUS

24 TO 36

VDC

36 TO 50

37.5

TRANSIENT 120 ms MAX

50 TO 80

OUTPUT POWER

12 TO 50

120

OUTPUT RIPPLE

FULL LOAD

12 TO 24

150

BW = 1O kHz TO 2 MHz

24 TO 36

mV p-p

36 to 50

1500

INPUT VOLTAGE

CONTINUOUS

VDC

TRANSIENT 120 ms

INPUT CURRENT

125

160

NO LOAD

INHIBITED, PIN 11 = 0 V

INPUT RIPPLE

FULL LOAD

150

mA p-p

BW = 10 kHz TO 10 MHz

EFFICIENCY

FULL LOAD

INHIBIT CURRENT

INHIBITED, PIN 11 = 0 VDC

12 TO 80

POWER FAIL FLAG

OUT

> 10, PIN 6

< 9.5

0.4, PIN 9

VDC

FLAG CURRENT = 0.4 mA

POWER FAIL

FALLING

9.5

VDC

THRESHOLD V

UNDERVOLTAGE

RISING

11.5

VDC

LOCKOUT

OUTPUT

ESR > 0.25 OHMS

330

1,000,000

µF

CAPACITOR

Input Voltage Range

· 12 to 50 VDC continuous
· 80 V for 120 msec transient

Case Operating Temperature (Tc)

· 55°C to +125°C full power
· 65°C to +135°C absolute

Derating Output Power/Current

· Derate linearly from 100% at 125°C to 0% at 135°C

Output Voltage Temperature Coefficient

· 0.01%/°C, typical

Isolation: Any pin to case

· 100 megohm minimum at 500 V

Conversion Frequency

· Free run mode 600 kHz, typical
· External sync range 550 to 650 kHz

Inhibit Pin Voltage (unit enabled)

· 10 V typical

Input Voltage Range

· 12 to 50 continuous

Output Power

· 120 watts

Lead Soldering Temperature (10 sec per lead)

· 300°C

Storage Temperature Range (Case)

· 65°C to +150°C

Sync (550 to 650 kHz.)

· Duty cycle 40% to 60%
· Logic low 0.8V, max
· Logic high 4.5 V, min
· Referenced to input common
· If sync is not used, leave unconnected

Inhibit: TTL Open Collector

· Logic low (output disabled)

Logic low voltage 1.3 V max

· Referenced to input common
· Logic high (output enabled)

Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.

PIN OUT

B6-12

LCM-120
120 WATT

Pin

LCM-120

Positive Input

Input Common

Output Common

Positive Output

No Connection

Power Fail Flag Return

Power Fail Flag Output

Inhibit

Sync

INE

ONDITIONING

ODULE

Angled corner indicates pin one.

TOP VIEW

LCM-120

(Pin side, marked side)

See Section B8, case U1, for dimensions.

IGURE

3: P

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.

27221-001-DTS Rev A

DQ# 3001

All technical information is believed to be accurate, but no responsibility is
assumed for errors or omissions. Interpoint reserves the right to make changes in
products or specifications without notice. LCM-120 is a trademark of Interpoint.
Copyright © 1995 - 1999 Interpoint. All rights reserved.

B8-36

CASE

CASE U

ASES

Materials
Header Cold Rolled Steel/Nickel/Gold
Cover

Kovar/Nickel

Pins #52

alloy/Gold

compression glass seal

Case dimensions in inches (mm)
Tolerance

0.005 (0.13) for three decimal places

0.01 (0.2) 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.

CASE U

TOP VIEW

(PIN SIDE)

See Figures 55 and 56 for dimensions

1.505 max (38.23)

3.005 (76.33) max.

Note: Pins are shown for Case U1.

Angled corner indicates pin one

IGURE

54: C

ASE

U M

AXIMUM

IMENSIONS

B8-37

CASE U

ASES

Angled corner

indicates pin one.

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) Lead Length

0.400 (10.16)

max.

0.220 (5.59

TOP VIEW CASE U1

MFL Series and MHP Series: Screening Standard, ES or 883
MFLHP Series, FMD270 EMI Filter, and FMD28-461SL EMI Filters:

Screening Standard or ES

SMFL, SMFLHP, SMHP, and SSP Series; SFCS, and SFME EMI Filters:

Screening Standard, Class H or K

HUM70 Module and LCM Module: Screening Standard or ES

Seam Seal

IGURE

55: C

ASE

C2-10

TEST (125°C Products)

STANDARD

/ES

/883 (Class H)*

PRE-CAP INSPECTION

Method 2017, 2032

yes

TEMPERATURE CYCLE (10 times)

Method 1010, Cond. C, -65°C to 150°C

yes

Method 1010, Cond. B, -55°C to 125°C

yes

CONSTANT ACCELERATION

Method 2001, 3000 g

yes

Method 2001, 500 g

yes

BURN-IN

Method 1015, 160 hours at 125°C

yes

96 hours at 125°C case (typical)

yes

FINAL ELECTRICAL TEST MIL-PRF-38534, Group A

Subgroups 1 through 6: -55°C, +25°C, +125°C

yes

Subgroups 1 and 4: +25°C case

yes

HERMETICITY TESTING

Fine Leak, Method 1014, Cond. A

yes

Gross Leak, Method 1014, Cond. C

yes

Gross Leak, Dip (1 x 10

-3

)

yes

FINAL VISUAL INSPECTION

Method 2009

yes

Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.

*883 products are built with element evaluated components and are 100% tested and guaranteed over

the full military temperature range of 55°C to +125°C.

MOR Series
MFLHP Series
MFL Series
MHP Series
MTR Series
MQO Series

MHD Series
MHV Series
MHF+ Series
MHF Series
MGA Series
MSA Series

MGH Series
MCH Series
FM-704A EMI Filter
FMD/FME EMI Filter
FMC EMI Filter
FMH EMI Filter

FMGA EMI Filter
FMSA EMI Filter
HUM Modules
LCM Modules
LIM Modules

QA SCREENING
125°C PRODUCTS

125°C P

RODUCTS

Applies to the following products (some models do not offer "883" screening, please refer to the individual
series datasheets to determine what screening is available):

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