FEATURES • _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 LCM-120 120 WATT LINE CONDITIONING MODULE 28 VOLT INPUT MODEL LCM-120 Output 24 to 36 VDC 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. 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: 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. 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 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. 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 LCM120 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 LINE CONDITIONING MODULE SYNC AND INHIBIT ABSOLUTE MAXIMUM RATINGS 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 TYPICAL CHARACTERISTICS 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 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) RECOMMENDED OPERATING CONDITIONS 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 Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified. PARAMETERS OUTPUT VOLTAGE 12 24 36 12 24 36 — MIN 23 — 35 — — — — — 12 — — — — — — — — LCM-120 TYP 24 VIN 36 36 — 150 50 1500 28 — 125 50 20 50 24 18 150 MAX 24.5 — 37.5 — 120 — — — 50 80 160 85 — — — — — — — — — 88 95 90 1 — — — — mA — 0.4, PIN 9 — VDC VIN FALLING — 9.5 10 VDC VIN RISING — 11.5 12 VDC ESR > 0.25 OHMS 330 — 1,000,000 µF CONDITIONS CONTINUOUS TRANSIENT 120 ms MAX OUTPUT POWER OUTPUT RIPPLE INPUT VOLTAGE FULL LOAD BW = 1O kHz TO 2 MHz CONTINUOUS TRANSIENT 120 ms INPUT CURRENT NO LOAD INHIBITED, PIN 11 = 0 V INPUT RIPPLE INPUT VOLTAGE AS A CONDITION 12 TO 24 24 TO 36 36 TO 50 50 TO 80 12 TO 50 12 TO 24 24 TO 36 36 to 50 FULL LOAD BW = 10 kHz TO 10 MHz EFFICIENCY INHIBIT CURRENT INHIBITED, PIN 11 = 0 VDC 12 24 36 12 TO 80 POWER FAIL FLAG VOUT > 10, PIN 6 < 9.5 FULL LOAD UNITS VDC V W mV p-p VDC mA mA p-p % FLAG CURRENT = 0.4 mA POWER FAIL THRESHOLD V UNDERVOLTAGE LOCKOUT OUTPUT CAPACITOR B6-10 LCM-120 120 WATT LINE CONDITIONING MODULE 10 TO 50 VDC 6 µF – 6 µF PWM CONTROLLER 6 µF 6 µF + RTN 0.01 Ω EMI FILTER LCM-120 ≈ +24 TO +40 VDC ENERGY STORAGE FOR HOLDUP IF REQUIRED MTR 28XXX MSA 28XXX (25W) (5W) CH RTN DISTRIBUTED POWER TO SYSTEM INTERFACE FIGURE 1: SYSTEM BLOCK DIAGRAM BUCK TRANSIENT ~ ~ BUCK NO CONTROL +24 BOOST VOUT – VOLTS ~ ~ +40 +10 +12 +24 +40 +50 +80 / 120 ms, VIN (Volts) FIGURE 2: OUTPUT VOLTAGE B6-11 LCM-120 120 WATT LINE CONDITIONING MODULE PIN OUT Pin 1 2 3 4 5 6 7 8 9 10 11 12 Angled corner indicates pin one. LCM-120 Positive Input Positive Input Input Common Input Common Output Common Positive Output No Connection No Connection Power Fail Flag Return Power Fail Flag Output Inhibit Sync 12 1 11 2 4 TOP VIEW LCM-120 (Pin side, marked side) 5 See Section B8, case U1, for dimensions. 3 6 9 8 7 FIGURE 3: PIN OUT MODEL NUMBERING KEY LCM – 120 / ES Base Model Output Power Screening (Standard screening has no designator in this position.) Note: There is only one LCM-120 model. B6-12 10 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. CASES CASE U Angled corner indicates pin one 1.505 max (38.23) CASE U TOP VIEW (PIN SIDE) See Figures 55 and 56 for dimensions 3.005 (76.33) max. Note: Pins are shown for Case U1. 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. FIGURE 54: CASE U MAXIMUM DIMENSIONS B8-36 CASES CASE U 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 Angled corner indicates pin one. 0.23 (5.8) Lead Length 0.128 dia (3.25). 1.505 (38.23) max. 0.040 dia (1.02) 1.380 (35.05) 1.250 (31.75) 1 12 1.050 (26.67) 2 11 0.850 (21.59) 3 10 0.650 (16.51) 4 9 0.450 (11.43) 5 8 0.250 (6.35) 6 7 0.220 (5.59 0.050 (1.27) 0.000 0.400 (10.16) max. 2.880 (73.15) 3.005 (76.33) max. 2.750 (69.85) 0.000 0.120 (3.05) 0.250 (6.35) 0.120 (3.05) 0.000 FIGURE 55: CASE U1 B8-37 QA SCREENING 125°C PRODUCTS 125°C PRODUCTS TEST (125°C Products) STANDARD /ES /883 (Class H)* PRE-CAP INSPECTION Method 2017, 2032 yes yes yes TEMPERATURE CYCLE (10 times) Method 1010, Cond. C, -65°C to 150°C Method 1010, Cond. B, -55°C to 125°C no no no yes yes no CONSTANT ACCELERATION Method 2001, 3000 g Method 2001, 500 g no no no yes yes no BURN-IN Method 1015, 160 hours at 125°C 96 hours at 125°C case (typical) no no no yes yes no FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 through 6: -55°C, +25°C, +125°C Subgroups 1 and 4: +25°C case no yes no yes yes no HERMETICITY TESTING Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) no no yes yes yes no yes yes no FINAL VISUAL INSPECTION Method 2009 yes yes 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. 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): MOR Series MHD Series MGH Series FMGA EMI Filter MFLHP Series MHV Series MCH Series FMSA EMI Filter MFL Series MHF+ Series FM-704A EMI Filter HUM Modules MHP Series MHF Series FMD/FME EMI Filter LCM Modules MTR Series MGA Series FMC EMI Filter LIM Modules MQO Series MSA Series FMH EMI Filter C2-10