FEATURES MRH SERIES 15 WATT DC/DC CONVERTERS 28 VOLT INPUT • –55°C to +85°C operation • 19 to 36 VDC input or 16 to 36 VDC input typical • Fully isolated • Magnetic feedback • Fixed frequency, 375 kHz typical • Topology – Single Ended Forward • 50 V for 50 ms transient protection • Inhibit function • Output trim • Indefinite short circuit protection • Radiation hardened to 1013 neutrons/sq cm neutron fluence 1011 rads(Si)/sec dose rate 105 rads(Si) total dose • Meets MIL-STD-704E emergency operation and transient standards MODELS VDC OUTPUT SINGLE 5 12 15 DUAL ±12 ±15 TRIPLE +5 & ±12 +5 & ±15 Size (max.): Non-flanged, case F3 1.950 x 1.350 x 0.455 inches (49.53 x 34.29 x 11.56 mm) Flanged, case J3 2.720 x 1.350 x 0.455 inches (69.09 x 34.29 x 11.56 mm) See Section B8, cases F3 and J3, for dimensions. Weight: 50 grams typical Screening: Standard or ES. See Section C2 for screening options and Section A5 for ordering information. DESCRIPTION The MRH Series™ of DC/DC converters offers up to 15 watts of power in a radiation hardened design. The low profile MRH converters are manufactured in Interpoint’s fully certified and qualified MIL-STD-1772 production facility and packaged in hermetically sealed steel cases. They are ideal for use in programs requiring high reliability, small size, and high levels of radiation hardening. The MRH converters are switching regulators which use a quasisquare wave, single ended forward converter design with a nominal switching frequency of 375 kHz, typical. Close regulation (main output line regulation is 0.05%) is maintained with advanced constant frequency pulse width modulation design techniques. With a 16 to 36 VDC input range and triple outputs of +5 VDC and either ±12 or ±15 VDC, MRH converters are suitable for a wide range of airborne, naval, and ground based applications. The MRH’s feed-forward compensation topology provides high levels (50 dB nominal) of input-to-output ripple rejection. The MRH converters provide full power operation from –55°C to +85°C with derated operation to +125°C. Flanged and non-flanged package configurations are available with optional environmental screening. INHIBIT FUNCTION The MRH Series incorporates an inhibit terminal that can be used to disable internal switching. The converter is inhibited when a logic low (≤ 0.8 V) signal is applied to the TTL open collector compatible inhibit pin. In the inhibit mode the inhibit pin current requirement is less than –2 mA. The converter resumes normal operation when a logic high (≥ 2.4 V) signal or open circuit is applied to the inhibit pin. The open circuit voltage of the inhibit is 5 to 6 volts. OUTPUT VOLTAGE TRIM The output voltage on single output models can be trimmed upward by as much as 5% of nominal by connecting a resistor between pin 3 and 4. RADIATION HARDENED The MRH DC/DC converters are designed to provide continuous normal operation through radiation levels associated with proximity to thermonuclear events. The converters will operate normally in environments with up to 1013 neutrons per square centimeter neutron fluence, 1011 rads (Si) per second dose rate, and 105 rads (Si) total dose. These levels of radiation tolerance make the MRH converters suitable for electronics in tactical programs where operation in high radiation environments is required. At the highest dose rating (1011 rads (Si)/sec dose rate) there will be an upset resulting in a dip in the voltage. This is non-destructive to the unit. The converter will operate through the upset. B4-19 MRH SERIES 15 WATT DC/DC CONVERTERS INHIBIT ABSOLUTE MAXIMUM RATINGS Power Dissipation (Pd) • 5W Output Power • 15 watts Lead Soldering Temperature (10 sec per lead) • 300°C Storage Temperature Range (Case) • –65°C to +125°C TYPICAL CHARACTERISTICS Inhibit TTL Open Collector • Logic low (output disabled) Inhibit pin current ≤ –2 mA • Referenced to input common • Logic high (output enabled) Open collector Output Voltage Temperature Coefficient • 250 ppm/°C max Input to Output Capacitance • 100 p, typical Current Limit • 125% of full load typical Isolation • 100 megohm minimum at 500 V Conversion Frequency • 375 kHz. typical Inhibit Pin Voltage (unit enabled) • 5 to 6 V Radiation (will operate through) • Neutron fluence 1013 neutrons/ sq. cm. • Radiation dose rate 1011 rads (Si) /sec • Total dose 105 rads (Si) RECOMMENDED OPERATING CONDITIONS Input Voltage Range • Continuous 16 to 40 VDC MRH28XXS and MRH2812D 19 to 40 VDC MRH2815D 16 to 36 VDC MRH285XXT • 50 V for 50 msec transient Case Operating Temperature (Tc) • –55°C to +85°C full power • –55°C to +125°C absolute DERATING OUTPUT POWER/CURRENT AND INPUT VOLTAGE Temperatures are referenced to the temperature at the converter’s baseplate • Linearly derate output power/current from 100% at 85°C to 0% at 125°C. • Above 105°C linearly derate steady state input voltage to 33 V and transient voltage to 38 V, at 125°C. • Operation below an input voltage of 19 volts, including operation in MILSTD-704E emergency power conditions, is possible with derated output power. See Figures 9 and 10. Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. SINGLE OUTPUT MODELS PARAMETER MRH2805S CONDITIONS MRH2812S MRH2815S MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS 4.95 5.0 5.05 11.88 12 12.12 14.85 15 15.15 VDC –55°C TO +85°C 0.05 — 3.0 0.02 — 1.25 0.016 — 1.0 A OUTPUT POWER MIN. TO MAX. VIN 0.25 — 15 0.25 — 15 0.25 — 15 W OUTPUT RIPPLE 10 kHz TO 2 MHz — 40 70 — 25 50 — 25 50 mV p-p 16 TO 40 VIN — 5 10 — 5 20 — 5 20 mV MIN. LOAD TO FULL — 5 30 — 5 30 — 5 30 mV NO LOAD TO FULL 16 28 40 16 28 40 19 28 40 VDC V OUTPUT VOLTAGE OUTPUT CURRENT LINE REGULATION LOAD REGULATION1 INPUT VOLTAGE2 INPUT CURRENT TRANSIENT 50 ms — — 50 — — 50 — — 50 NO LOAD — 50 60 — 50 60 — 50 60 FULL LOAD — — 750 — — 730 — — 720 INHIBITED — 22 25 — 22 25 — 22 25 mA INPUT RIPPLE CURRENT 10 kHz TO10 MHz — 25 50 — 25 50 — 25 50 mA p-p 73 75 — 76 78 — 78 80 — % SHORT CIRCUIT — 5 — — 5 — — 5 — OVERLOAD — 5 — — 5 — — 5 — DELAY — 3 10 — 3 10 — 3 10 EFFICIENCY LOAD FAULT3 POWER DISSIPATION START-UP Notes 1. Load regulation is not guaranteed below minimum load. 2. Converter should not be inhibited or operated below 12 Vin above 104 rads (Si) total dose. B4-20 W ms 3. Indefinite short circuit protection is not guaranteed above 85°C case. MRH SERIES 15 WATT DC/DC CONVERTERS Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. DUAL AND TRIPLE OUTPUT MODELS PARAMETER OUTPUT VOLTAGE MRH2812D CONDITION MIN TYP MRH2815D MAX MIN TYP MRH2812T MAX MAIN +11.88 +12.0 +12.12 +14.85 +15.0 +15.15 MRH2815T MIN TYP MAX +4.95 +5.0 +5.05 MIN TYP MAX AUX. –11.82 –12.0 –12.18 –14.77 –15.0 –15.23 ±11.50 ±12.0 ±12.50 ±14.40 ±15.0 ±15.60 OUTPUT CURRENT1 MAIN +0.01 +0.625 +1.0 +0.008 +0.50 +0.8 +0.40 +1.80 +2.00 +0.40 +1.80 +2.00 –55°C TO +85°C AUX. –0.01 –0.625 –0.008 –0.50 –0.8 ±0.00 ±0.25 ±0.50 ±0.00 ±0.20 ±0.40 OUTPUT POWER1 MAIN — 7.5 12 — 7.5 12 2 9 10 2 9 AUX. — 7.5 12 — 7.5 12 0 3 6 0 3 6 TOTAL 0.25 — 15 0.25 — 15 2 – 15 2 – 15 OUTPUT RIPPLE MAIN — 40 60 — 40 60 – 50 75 – 30 50 VOLTAGE, 10 kHz - 2 MHz AUX. — 40 60 — 40 60 – 30 50 – 30 50 LINE REGULATION MAIN — 5 20 — 5 20 — 5 10 — 5 10 VIN = MIN. TO MAX. AUX. — 20 100 — 20 100 — 200 400 — 250 500 LOAD REGULATION2 MAIN — 5 30 — 5 30 — 5 10 — 5 10 NO LOAD TO FULL AUX. — 10 100 — 10 100 — 200 400 — 250 500 INPUT VOLTAGE3 INPUT CURRENT –1.0 UNITS +4.95 +5.0 +5.05 VDC A 10 W mV p-p mV mV CONTINUOUS 16 28 40 19 28 40 16 28 36 16 28 36 VDC TRANSIENT 50 ms — — 50 — — 50 — — 40 — — 40 V NO LOAD — 55 70 — 55 70 — 70 80 — 85 95 FULL LOAD — — 700 — — 700 — — 770 — — 778 INHIBITED — 22 25 — 22 25 — 23 25 — 23 25 mA INPUT RIPPLE CURRENT 10 kHz TO 2 MHz — 25 50 — 25 50 — 25 50 — 25 50 mA p-p 76 78 — 76 78 — 70 72 — 70 72 — % SHORT CIRCUIT — 5 — — 5 — — 5 — — 5 — OVERLOAD — 5 — — 5 — — 5 — — 5 — DELAY — 3 10 — 3 10 — 3 10 — 3 10 EFFICIENCY LOAD FAULT4 POWER DISSIPATION START-UP W ms Notes 1. Maximum combined output power is 15 watts for both dual and triple models. Dual output models: The maximum specification is the total output current/power. Up to 80% of that total is available from either output provided the positive output maintains a minimum of 20% of the total power used. Triple output models: The maximum combined power of the auxiliaries is 6 watts, of which 100% is available from either output. 2. Load regulation is not guaranteed below minimum load. 3. Converter should not be inhibited or operated below 12 Vin above 104 rads (Si) total dose. 4. Indefinite short circuit protection is not guaranteed above 85°C case. PIN OUT Dot on top of cover indicates pin one. Pin 1 2 3 4 5 6 7 8 9 10 Single Output Positive Input No connection Trim Output Common Positive Output No connection Case Ground Inhibit No connection Input Common Dual Output Positive Input No connection Negative Output Output Common Positive Output No connection Case Ground Inhibit No connection Input Common Triple Output Positive Input Main (+5) Output Output Common Neg. Aux. Output Pos. Aux. Output No connection Case Ground Inhibit No connection Input Common 1 2 3 4 5 BOTTOM VIEW MRH FLANGED AND NON-FLANGED See Section B8, cases F3 and J3, for dimensions. Dotted line outlines flanged package option. 10 9 8 7 6 FIGURE 1: PIN OUT B4-21 MRH SERIES 15 WATT DC/DC CONVERTERS MRH 28 12 T F / ES Base Model Input Voltage Output Voltage (Aux. Vout for triple models) MODEL NUMBERING KEY Number of Outputs (S = single, D = dual, T = triple) Case Option (Non-flanged case has no designator in this position) Screening (Standard screening has no designator in this position.) Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, unless otherwise specified. 90 80 40V 28V 60 50 70 Efficiency (%) 70 16 72 16V Efficiency (%) 80 Efficiency (%) 74 90 16V 36V 70 28V 60 28 68 36 66 64 62 60 50 58 4 6 8 10 12 40 14 15 4 6 8 10 12 8 10 14 15 12 Output Power (Watts) Output Power (Watts) MRH2805S Efficiency MRH2815D Efficiency MRH2815T Efficiency FIGURE 4 FIGURE 3 10 8 35 –Vout (% of nominal) 40 Attenuation (dB) 5 6 Output Power (Watts) FIGURE 2 45 50 55 60 65 70 75 6 4 2 0 –2 –4 –6 –8 80 –10 85 0.1 56 14 15 1 10 Frequency (kHz) 100 Audio Rejection, MRH Series 0 3 6 9 12 Pos. Output Power (Watts) 15 15 12 9 6 3 Neg. Output Power (Watts) 0 ±Aux. Output Voltage (% of nominal) 40 0 –1 –2 –3 –4 –5 –6 –7 –8 –9 0 1 2 3 4 5 6 7 8 9 Main Output Power (Watts) MRH2815T Aux. Reg. vs. Main Load MRH2815D Neg. Output Cross Reg. 1 –AUX -1 -2 -3 0 1 2 3 4 5 6 Pos. Aux. Output Power (Watts) 6 5 4 3 2 1 0 Neg. Aux. Output Power (Watts) MRH2815T Aux. Output with Unbalanced Loads FIGURE 8 B4-22 14.5 14.0 13.5 13.0 14 13 12 12.5 -4 -5 Input Voltage (Volts) +AUX Input Voltage (Volts) ± Aux. Ouptut Voltage (% of nominal) 15.0 2 0 15 15.5 5 4 3 FIGURE 7 FIGURE 6 FIGURE 5 12.0 2 4 6 8 10 12 14 15 Output Power (Watts) 50 mV Drop MRH2805S Low Line Dropout FIGURE 9 23821-001-DTS Rev A DQ# 1020 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. MRH Series is a trademark of Interpoint. Copyright © 1994 - 1999 Interpoint. All rights reserved. 11 1 3 5 7 9 11 13 15 Output Power (Watts) MRH2815T Low Line Dropout FIGURE 10 CASES CASE F Dot on top of case indicates pin one CASE F BOTTOM VIEW See Figures 20 - 23 for pin configuration Materials Header Case F1 Cold Rolled Steel/Nickel/Gold Cases F2 - F4 Cold Rolled Steel/Nickel/Tin Cover Case F1 Kovar/Nickel Cases F2 - F4 Cold Rolled Steel/Nickel/Tin Pins #52 alloy (all cases) MHV Series Triple – compression glass seal MTR Series Triple, case F1 – ceramic seal MTR Series Triple, case F2 – compression glass seal HUM40 – compression glass seal or ceramic seal Case F3 – compression glass seal Case F4 – compression glass seal or ceramic seal 1.350 max (34.29) 1.950 max (49.53) 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 dimensions in inches (mm) Tolerance ±0.005 (0.13) for three decimal places ±0.01 (0.2) for two decimal places unless otherwise specified FIGURE 19: CASE F MAXIMUM DIMENSIONS BOTTOM VIEW CASE F1 MTR Series Triple and MHV Series Triple: Screening – Standard, ES, or 883 Platform Bathtub Dot on top of case indicates pin one Seam Seal 1.170 (29.72) 0.040 dia. (1.02) 1 2 3 4 5 10 9 8 7 6 MTR Series MHV Series 0.170 (4.32) 1.770 (44.96) 1.370 (34.80) 0.970 (24.64) 0.570 (14.48) 0.170 (4.32) 0.000 0.25 (6.4) 0.000 0.25 (6.4) 0.405 max (10.29) 0.000 0.405 max (10.29) 0.000 FIGURE 20: CASE F1 Note: Although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. Please refer to the numerical dimensions for accuracy. B8-12 CASES CASE F BOTTOM VIEW CASE F2 HUM-40: Screening – Standard or ES Squared corner and dot on top of case indicate pin one. Solder Seal 1.170 (29.72) 1 2 3 4 5 10 9 8 7 6 0.040 dia. (1.02) Solder Tip-off 0.170 (4.32) 1.770 (44.96) 1.370 (34.80) 0.970 (24.64) 0.570 (14.48) 0.170 (4.32) 0.000 0.250/0.300 (6.35/7.62) 0.000 0.415 ±0.015 (10.54 ±0.38) 0.000 FIGURE 21: CASE F2 BOTTOM VIEW CASE F3 MRH Series: Screening – Standard or ES Squared corner and dot on top of case indicate pin one. Solder Seal 1.170 (29.72) 1 2 3 4 5 10 9 8 7 6 0.040 dia. (1.02) Solder Tip-off 0.170 (4.32) 1.770 (44.96) 1.370 (34.80) 0.970 (24.64) 0.570 (14.48) 0.170 (4.32) 0.000 0.250/0.300 (6.35/7.62) 0.000 0.455 max (11.56 ) 0.000 FIGURE 22: CASE F3 B8-13 CASES CASE J Dot on top of case indicates pin one CASE J BOTTOM VIEW See Figures 36 - 40 for pin configuration 1.350 max (34.29) 2.720 max (69.09) Flange Thickness: Cases J1 and J5 Case J2 Cases J3 and J4 0.060 (1.52) 0.073 (1.85) max 0.067 +0.005/-0.007 (1.70 +0.13/-0.8) Materials Header Case J1 Cold Rolled Steel/Nickel/Gold Cases J2 - J5 Cold Rolled Steel/Nickel/Tin Cover Case J1 Kovar/Nickel Case J2 - J5 Cold Rolled Steel/Nickel/Tin Pins #52 alloy (all cases) Case J1 MHV Series Triple – compression glass seal MTR Series Triple – ceramic seal Cases J2 - J5 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 35: CASE J MAXIMUM DIMENSIONS Note: Although every effort has been made to render the case drawings at actual size, variations in the printing process may cause some distortion. Please refer to the numerical dimensions for accuracy. B8-22 CASES CASE J BOTTOM VIEW CASE J2 Flanged case: Designator required in Case Option position of model number. HUM-40 Module: Screening – Standard or ES Squared corner and dot on top of case indicate pin one. Solder Seal 1.173 (29.79 1 0.040 dia. (1.02) 2 0.673 (17.09) 3 4 5 7 6 HUM-40 Module Solder Tip-off 10 0.173 (4.39) 9 8 1.980 (50.29) 1.770 (44.96) 1.370 (34.80) 0.970 (24.64) 0.570 (14.48) 0.170 (4.32) 0.000 0.210 (5.33) 0.25 (6.4) 0.000 0.415 max (10.54) 0.000 FIGURE 37: CASE J2 BOTTOM VIEW CASE J3 Flanged case: Designator required in Case Option position of model number. MRH Series: Screening – Standard or ES Squared corner and dot on top of case indicate pin one. Solder Seal 1.173 (29.79 1 0.040 dia. (1.02) 2 3 4 5 0.162 dia (4.11) 0.673 (17.09) 9 8 7 6 1.770 (44.96) 10 0.173 (4.39) 1.370 (34.80) Solder Tip-off FIGURE 38: CASE J3 B8-24 1.980 (50.29) 0.970 (24.64) 0.570 (14.48) 0.170 (4.32) 0.000 0.210 (5.33) 0.25 (6.4) 0.000 0.455 max (11.56) 0.000 QA SCREENING 85°C PRODUCTS 85°C PRODUCTS TEST (85°C Products excluding HR products) STANDARD /ES yes yes no yes no yes no yes yes yes Fine Leak, Method 1014, Cond. A no yes Gross Leak, Method 1014, Cond. C no yes Gross Leak, Dip (1 x 10-3) yes no yes yes PRE-CAP INSPECTION Method 2017 TEMPERATURE CYCLE (10 times) Method 1010, Cond. B, -55°C to 125°C CONSTANT ACCELERATION Method 2001, 500 g BURN-IN 96 hours at 70°C ambient (typical) FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 and 4: +25°C case HERMETICITY TESTING FINAL VISUAL INSPECTION Method 2009 Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. Applies to the following products: MFW Series MTW Series MHE/MLP Series MHL Series MRH Series MTO Series MSR Series DCH Series FM/FMA/FMB EMI Filters MSF EMI Filter C2-12