MRH2805S

MRH2805S INTERPOINT | Alldatasheet

Document overview

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Technical content

FEATURES

• –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 13 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

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 quali- fied 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 quasi- square 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. O UTPUT 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. R ADIATION H ARDENED 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 10 13 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 oper- ation in high radiation environments is required. At the highest dose rating (10 11 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. DC/DC C ONVERTERS

28 VOLT INPUT

15 W ATT

±12 ±15 TRIPLE +5 & ±12 +5 & ±15 Size (max.): Non-flanged, case F3 Flanged, case J3 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.

RECOMMENDED OPERATING CONDITIONS ABSOLUTE MAXIMUM RATINGS INHIBIT Power Dissipation (Pd)

• 5 W Output Power
• 15 watts Lead Soldering Temperature (10 sec per lead)
• 300°C Storage Temperature Range (Case)
• –65°C to +125°C B4-20 MRH SERIES
• 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 Inhibit TTL Open Collector
• Logic low (output disabled) Inhibit pin current ≤ –2 mA
• Referenced to input common
• Logic high (output enabled) Open collector Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. SINGLE OUTPUT MODELS MRH2805S MRH2812S MRH2815S PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS OUTPUT RIPPLE 10 kHz TO 2 MHz — 40 70 — 25 50 — 25 50 mV p-p LINE REGULATION 16 TO 40 V IN — 5 10 — 5 20 — 5 20 mV LOAD REGULATION 1 MIN. LOAD TO FULL — 5 30 — 5 30 — 5 30 mV INPUT VOLTAGE 2 NO LOAD TO FULL 16 28 40 16 28 40 19 28 40 VDC TRANSIENT 50 ms — — 50 — — 50 — — 50 V INPUT CURRENT NO LOAD — 50 60 — 50 60 — 50 60 FULL LOAD — — 750 — — 730 — — 720 mA INHIBITED — 22 25 — 22 25 — 22 25 INPUT RIPPLE CURRENT 10 kHz TO10 MHz — 25 50 — 25 50 — 25 50 mA p-p EFFICIENCY 73 75 — 76 78 — 78 80 — % LOAD FAULT

3 SHORT CIRCUIT — 5 — — 5 — — 5 —

W POWER DISSIPATION OVERLOAD — 5 — — 5 — — 5 — START-UP DELAY — 3 10 — 3 10 — 3 10 ms Notes 1. Load regulation is not guaranteed below minimum load. 2. Converter should not be inhibited or operated below 12 Vin above 10 rads (Si) total dose. 3. Indefinite short circuit protection is not guaranteed above 85°C case. 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) 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 MIL- STD-704E emergency power conditions, is possible with derated output power. See Figures 9 and 10.

DUAL AND TRIPLE OUTPUT MODELS MRH2812D MRH2815D MRH2812T MRH2815T PARAMETER CONDITION MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS VDC OUTPUT POWER 1 MAIN — 7.5 12 — 7.5 12 2 9 10 2 9 10 AUX. — 7.5 12 — 7.5 12 0 3 6 0 3 6 W 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 mV p-p LINE REGULATION MAIN — 5 20 — 5 20 — 5 10 — 5 10 mV VIN = MIN. TO MAX. AUX. — 20 100 — 20 100 — 200 400 — 250 500 LOAD REGULATION 2 MAIN — 5 30 — 5 30 — 5 10 — 5 10 mV NO LOAD TO FULL AUX. — 10 100 — 10 100 — 200 400 — 250 500 INPUT VOLTAGE 3 CONTINUOUS 16 28 40 19 28 40 16 28 36 16 28 36 VDC TRANSIENT 50 ms — — 50 — — 50 — — 40 — — 40 V INPUT CURRENT NO LOAD — 55 70 — 55 70 — 70 80 — 85 95 FULL LOAD — — 700 — — 700 — — 770 — — 778 mA INHIBITED — 22 25 — 22 25 — 23 25 — 23 25 INPUT RIPPLE CURRENT 10 kHz TO 2 MHz — 25 50 — 25 50 — 25 50 — 25 50 mA p-p EFFICIENCY 76 78 — 76 78 — 70 72 — 70 72 — % LOAD FAULT W POWER DISSIPATION OVERLOAD — 5 — — 5 — — 5 — — 5 — START-UP DELAY — 3 10 — 3 10 — 3 10 — 3 10 ms B4-21 MRH SERIES

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 10 4 rads (Si) total dose. 4. Indefinite short circuit protection is not guaranteed above 85°C case. Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. PIN OUT Pin Single Output Dual Output Triple Output

1 Positive Input Positive Input Positive Input

2 No connection No connection Main (+5) Output

3 Trim Negative Output Output Common

4 Output Common Output Common Neg. Aux. Output 5 Positive Output Positive Output Pos. Aux. Output

6 No connection No connection No connection

7 Case Ground Case Ground Case Ground

8 Inhibit Inhibit Inhibit

9 No connection No connection No connection

10 Input Common Input Common Input Common

Dot on top of cover indicates pin one. BOTTOM VIEW MRH FLANGED AND NON-FLANGED See Section B8, cases F3 and J3, for dimensions. 10 9 8 7 6 12345 Dotted line outlines flanged package option. FIGURE 1: PIN O UT

(Non-flanged case has no designator in this position) (S = single, D = dual, T = triple) (Aux. Vout for triple models) (Standard screening has no designator in this position.) B4-22 DC/DC C ONVERTERS Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, unless otherwise specified. FIGURE 5 FIGURE 7 850.1 1 10 100 Audio Rejection, MRH Series Attenuation (dB) Frequency (kHz) –9 09 12345678 Main Output Power (Watts) MRH2815T Aux. Reg. vs. Main Load –Aux. Output Voltage (% of nominal) Output Power (Watts) MRH2805S Efficiency Efficiency (%) 41 5 16V 28V 40V 6 8 10 12 14 FIGURE 2 41 5 6 8 10 12 14 28V 36V 16V Output Power (Watts) MRH2815D Efficiency Efficiency (%) FIGURE 3 –10 MRH2815D Neg. Output Cross Reg. –Vout (% of nominal) 0 3 6 9 12 15 Pos. Output Power (Watts) 15 12 9 6 3 0 Neg. Output Power (Watts) FIGURE 6 FIGURE 4 51 5 6 8 10 12 14 Output Power (Watts) MRH2815T Efficiency Efficiency (%) +AUX –AUX MRH2815T Aux. Output with Unbalanced Loads – Aux. Ouptut Voltage (% of nominal)0 1234 56 Pos. Aux. Output Power (Watts) 6 5432 10 Neg. Aux. Output Power (Watts) FIGURE 8 12.0 152 12.5 13.0 13.5 14.0 14.5 15.0 4 6 8 10 12 14 15.5 Output Power (Watts) 50 mV Drop MRH2805S Low Line Dropout Input Voltage (Volts) FIGURE 9 FIGURE 10 13579 1 1 1 3 1 5 Output Power (Watts) MRH2815T Low Line Dropout Input Voltage (Volts) MRH SERIES 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.

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 CASE J BOTTOM VIEW See Figures 36 - 40 for pin configuration 1.350 max (34.29) 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. Flange Thickness: Cases J1 and J5 0.060 (1.52) Case J2 0.073 (1.85) max 2.720 max (69.09) Dot on top of case indicates pin one FIGURE 35: CASE J MAXIMUM D IMENSIONS 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.

85°C PRODUCTS TEST (85°C Products excluding HR products) STANDARD /ES PRE-CAP INSPECTION Method 2017 yes yes TEMPERATURE CYCLE (10 times) Method 1010, Cond. B, -55°C to 125°C no yes CONSTANT ACCELERATION Method 2001, 500 g no yes BURN-IN 96 hours at 70°C ambient (typical) no yes FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 and 4: +25°C case yes yes HERMETICITY TESTING 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 FINAL VISUAL INSPECTION Method 2009 yes yes Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. 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 85°C PRODUCTS Applies to the following products: