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FEATURES
* -55C to +85C 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
DC/DC CONVERTERS 28 VOLT INPUT
SINGLE 5 12 15
MRH SERIES 15 WATT
MODELS
VDC OUTPUT 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 SeriesTM 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 -55C to +85C with derated operation to +125C. 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
ABSOLUTE MAXIMUM RATINGS
DC/DC CONVERTERS
INHIBIT
Inhibit TTL Open Collector * Logic low (output disabled) Inhibit pin current -2 mA * Referenced to input common * Logic high (output enabled) Open collector
TYPICAL CHARACTERISTICS
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)
Power Dissipation (Pd) * 5W Output Power * 15 watts Lead Soldering Temperature (10 sec per lead) * 300C Storage Temperature Range (Case) * -65C to +125C
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) * -55C to +85C full power * -55C to +125C 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 85C to 0% at 125C. * Above 105C linearly derate steady state input voltage to 33 V and transient voltage to 38 V, at 125C. * 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: 25C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
SINGLE OUTPUT MODELS PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT OUTPUT POWER OUTPUT RIPPLE LINE REGULATION LOAD REGULATION1 INPUT VOLTAGE2 -55C TO +85C MIN. TO MAX. VIN 10 kHz TO 2 MHz 16 TO 40 VIN MIN. LOAD TO FULL NO LOAD TO FULL TRANSIENT 50 ms INPUT CURRENT NO LOAD FULL LOAD INHIBITED INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT3 POWER DISSIPATION START-UP SHORT CIRCUIT OVERLOAD DELAY 10 kHz TO10 MHz -- 73 -- -- -- 25 75 5 5 3 50 -- -- -- 10 -- 76 -- -- -- 25 78 5 5 3 50 -- -- -- 10 -- 78 -- -- -- 25 80 5 5 3 50 -- -- -- 10 ms mA p-p % W CONDITIONS MIN 4.95 0.05 0.25 -- -- -- 16 -- -- -- -- MRH2805S TYP 5.0 -- -- 40 5 5 28 -- 50 -- 22 MAX 5.05 3.0 15 70 10 30 40 50 60 750 25 MIN 11.88 0.02 0.25 -- -- -- 16 -- -- -- -- MRH2812S TYP 12 -- -- 25 5 5 28 -- 50 -- 22 MAX 12.12 1.25 15 50 20 30 40 50 60 730 25 MIN 14.85 0.016 0.25 -- -- -- 19 -- -- -- -- MRH2815S TYP 15 -- -- 25 5 5 28 -- 50 -- 22 MAX 15.15 1.0 15 50 20 30 40 50 60 720 25 mA UNITS VDC A W mV p-p mV mV VDC V
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.
3. Indefinite short circuit protection is not guaranteed above 85C case.
B4-20
DC/DC CONVERTERS
DUAL AND TRIPLE OUTPUT MODELS PARAMETER OUTPUT VOLTAGE CONDITION MAIN AUX. OUTPUT CURRENT1 -55C TO +85C OUTPUT POWER1 MAIN AUX. MAIN AUX. TOTAL OUTPUT RIPPLE VOLTAGE, 10 kHz - 2 MHz LINE REGULATION VIN = MIN. TO MAX. LOAD REGULATION2 NO LOAD TO FULL INPUT VOLTAGE3 MAIN AUX. MAIN AUX. MAIN AUX. CONTINUOUS TRANSIENT 50 ms INPUT CURRENT NO LOAD FULL LOAD INHIBITED INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT4 POWER DISSIPATION START-UP SHORT CIRCUIT OVERLOAD DELAY 10 kHz TO 2 MHz -- 76 -- -- -- 25 78 5 5 3 50 -- -- -- 10 -- 76 -- -- -- 25 78 5 5 3 50 -- -- -- 10 -- 70 -- -- -- 25 72 5 5 3 50 -- -- -- 10 -- 70 -- -- -- MRH2812D MIN TYP MAX MRH2815D MIN TYP MAX MRH2812T MIN +4.95 TYP +5.0 MAX +5.05 MIN
MRH SERIES 15 WATT
MRH2815T TYP MAX UNITS VDC A
Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
+11.88 +12.0 +12.12 -11.82 -12.0 -12.18 +0.01 +0.625 +1.0 -0.01 -0.625 -- -- 0.25 -- -- -- -- -- -- 16 -- -- -- -- 7.5 7.5 -- 40 40 5 20 5 10 28 -- 55 -- 22 -1.0 12 12 15 60 60 20 100 30 100 40 50 70 700 25
+14.85 +15.0 +15.15
+4.95 +5.0 +5.05
-14.77 -15.0 -15.23 11.50 12.0 12.50 14.40 15.0 15.60 +0.008 +0.50 -0.008 -0.50 -- -- 0.25 -- -- -- -- -- -- 19 -- -- -- -- 7.5 7.5 -- 40 40 5 20 5 10 28 -- 55 -- 22 +0.8 -0.8 12 12 15 60 60 20 100 30 100 40 50 70 700 25 +0.40 +1.80 +2.00 0.00 0.25 0.50 2 0 2 - - -- -- -- -- 16 -- -- -- -- 9 3 - 50 30 5 200 5 200 28 -- 70 -- 23 10 6 15 75 50 10 400 10 400 36 40 80 770 25 +0.40 +1.80 +2.00 0.00 0.20 0.40 2 0 2 - - -- -- -- -- 16 -- -- -- -- 9 3 - 30 30 5 250 5 250 28 -- 85 -- 23 10 6 15 50 50 10 500 10 500 36 40 95 778 25
W
mV p-p
mV
mV VDC V
mA
25 72 5 5 3
50 -- -- -- 10
mA p-p % 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 85C 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. 10 9 8 7 6
Dotted line outlines flanged package option.
FIGURE 1: PIN OUT
B4-21
MRH SERIES 15 WATT
DC/DC CONVERTERS
MRH Base Model Input Voltage 28 12 T F / ES
MODEL NUMBERING KEY
Output Voltage (Aux. Vout for triple models) 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: 25C Tc , 28 VDC Vin, 100% load, unless otherwise specified.
90 80 16V 90 16V 80 74 72 70 16
Efficiency (%)
Efficiency (%)
Efficiency (%)
68 66 64 62 60 58
28 36
70 40V 28V 60 50 40
70 28V 60 50 40
36V
4
6
8
10
12
14 15
4
6
8
10
12
14 15
56
56
8
10
12
14 15
Output Power (Watts)
Output Power (Watts)
Output Power (Watts)
MRH2805S Efficiency
MRH2815D Efficiency
MRH2815T Efficiency
FIGURE 2
10 35 8 6 4 2 0 -2 -4 -6 -8 -10 1 10 Frequency (kHz) 100
FIGURE 3
Aux. Output Voltage (% of nominal)
0 -1 -2 -3 -4 -5 -6 -7 -8 -9 0 1
FIGURE 4
Attenuation (dB)
45 50 55 60 65 70 75 80 85 0.1
-Vout (% of nominal)
40
0 3 6 9 12 Pos. Output Power (Watts) 15 12 9 6 3 Neg. Output Power (Watts)
15 0
2
3
4
5
6
7
8
9
Main Output Power (Watts)
Audio Rejection, MRH Series
MRH2815T Aux. Reg. vs. Main Load
MRH2815D Neg. Output Cross Reg.
FIGURE 5
Aux. Ouptut Voltage (% of nominal)
5 4 15.5
FIGURE 6
15
FIGURE 7
Input Voltage (Volts)
3 2 1 0 -1 -2 -3 -4 -5
Input Voltage (Volts)
2 4 6 8 10 12 14 15
+AUX
15.0 14.5 14.0 13.5 13.0 12.5
14
-AUX
13
12
0 1 2 3 4 5 6 Pos. Aux. Output Power (Watts) 6 5 4 3 2 1 0 Neg. Aux. Output Power (Watts)
12.0
11
1
3
5
7
9
11 13 15
Output Power (Watts) 50 mV Drop
Output Power (Watts)
MRH2805S Low Line Dropout
MRH2815T Low Line Dropout
MRH2815T Aux. Output with Unbalanced Loads
FIGURE 8
FIGURE 9
FIGURE 10
B4-22
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 (c) 1994 - 1999 Interpoint. All rights reserved.
CASE F
CASES
Dot on top of case indicates pin one 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 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
CASE F BOTTOM VIEW See Figures 20 - 23 for pin configuration
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 300C for 10 seconds per pin.
FIGURE 19: CASE F MAXIMUM DIMENSIONS
BOTTOM VIEW CASE F1 MTR Series Triple and MHV Series Triple: Screening - Standard, ES, or 883
Bathtub Platform Dot on top of case indicates pin one
1.170 (29.72) 0.040 dia. (1.02) MHV Series MTR Series
Seam Seal
1
2
3
4
5
10 0.170 (4.32) 0.000 0.25 (6.4) 0.405 max (10.29) 0.000 0.000 0.170 (4.32)
9
8
7
6
0.570 (14.48)
0.970 (24.64)
1.370 (34.80)
0.405 max (10.29)
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
0.25 (6.4)
FIGURE 20: CASE F1
1.770 (44.96)
0.000
CASES
BOTTOM VIEW CASE F2 HUM-40: Screening - Standard or ES
Solder Seal
1.170 (29.72) 0.040 dia. (1.02)
CASE F
Squared corner and dot on top of case indicate pin one.
1
2
3
4
5
Solder Tip-off
0.170 (4.32) 0.000 0.415 0.015 (10.54 0.38) 0.250/0.300 (6.35/7.62) 0.000 0.000
10
9
8
7
6
0.170 (4.32)
0.570 (14.48)
0.970 (24.64)
1.370 (34.80) 3
FIGURE 21: CASE F2
BOTTOM VIEW CASE F3 MRH Series: Screening - Standard or ES
Solder Seal
1.170 (29.72) 0.040 dia. (1.02)
Squared corner and dot on top of case indicate pin one.
1
2
1.770 (44.96) 4
5
Solder Tip-off
0.170 (4.32) 0.000 0.250/0.300 (6.35/7.62) 0.455 max (11.56 ) 0.000 0.000
10
9
8
7
6
0.170 (4.32)
0.570 (14.48)
0.970 (24.64)
1.370 (34.80)
FIGURE 22: CASE F3
1.770 (44.96)
B8-13
CASE J
CASES
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 300C 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
CASE J
CASES
BOTTOM VIEW CASE J2 Flanged case: Designator required in Case Option position of model number. HUM-40 Module: Screening - Standard or ES
Solder Seal
1.173 (29.79 0.040 dia. (1.02) 0.673 (17.09)
Squared corner and dot on top of case indicate pin one.
1
2
3
4
5
HUM-40 Module
Solder Tip-off
0.173 (4.39) 0.000 0.000 0.25 (6.4) 0.210 (5.33) 0.000 0.170 (4.32) 0.570 (14.48) 0.970 (24.64) 1.370 (34.80) 0.415 max (10.54) 1.770 (44.96) 1.980 (50.29) 5 0.162 dia (4.11) 6 1.980 (50.29) 10 9 8 7 6
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
Solder Seal
1.173 (29.79 0.040 dia. (1.02) 0.673 (17.09)
Squared corner and dot on top of case indicate pin one.
1
2
3
4
Solder Tip-off
0.173 (4.39) 0.000 0.000 0.25 (6.4) 0.210 (5.33) 0.000 0.170 (4.32) 0.570 (14.48) 0.970 (24.64) 1.370 (34.80) 0.455 max (11.56) 1.770 (44.96) 10 9 8 7
FIGURE 38: CASE J3
B8-24
QA SCREENING 85C PRODUCTS
85C PRODUCTS
TEST (85C Products excluding HR products) PRE-CAP INSPECTION Method 2017 TEMPERATURE CYCLE (10 times) Method 1010, Cond. B, -55C to 125C CONSTANT ACCELERATION Method 2001, 500 g BURN-IN 96 hours at 70C ambient (typical) FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 and 4: +25C case HERMETICITY TESTING Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) FINAL VISUAL INSPECTION Method 2009 yes yes no no yes yes yes no yes yes no yes no yes no yes yes yes STANDARD /ES
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

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