FEATURES • –55°C to +85°C operation • 10 to 16 VDC input or 16 to 36 VDC input typical • Fully isolated • Opto-coupler feedback • Fixed frequency 125 kHz typical • Topology – Push-Pull Forward • Transient protection 50 V for up to 50 ms 28 Vin models • Inhibit function • Indefinite short circuit protection • Trimmable output on single models • Up to 83% efficiency DC/DC CONVERTERS 12 AND 28 VOLT INPUT MHE SERIES 20 WATT MODELS VDC OUTPUT SINGLE DUAL 5 ±12 12 ±15 15 Size (max.): Non-flanged 2.125 x 1.125 x 0.495 (case H6) inches (53.98 x 28.58 x 12.57 mm) Flanged 2.910 x 1.125 x 0.495 (case K7) inches (73.91 x 28.58 x 12.57 mm) See Section B8, cases H6 and K7, for dimensions. Weight: 50 grams typical Screening: Standard or ES. See Section C2 for screening options, see Section A5 for ordering information. DESCRIPTION The MHE Series™ DC/DC converters offer the high efficiencies associated with switching regulators, yet have full isolation and the excellent regulation typical of linear regulators. No external components are required for operation. MHE Series converters are built using thick-film hybrid technology, and are sealed in metal packages for military, aerospace, and other high-reliability applications. Unscreened models are solder sealed and are guaranteed to pass a gross leak test (maximum leak rate of 1 x 10-3 atm.-cc/sec). Environmentally screened models are hermetically sealed and are screened as described in Section C2. The MHE Series converters are pulse-width modulated switching regulators operating in the forward mode, with a nominal switching frequency of 125 to 140 kHz. Isolation is achieved through the use of a transformer in the forward power circuit, and an optocoupler is used in the feedback/control loop. The full load output power is available over the full input voltage range. Short-term transients of 50 volts will not impair normal operation for 28 volt input models. The efficiency is typically greater than 80% over the entire input voltage range and from approximately 25% of full load to full load. This feature makes the MHE Series converters ideal for either battery or aircraft power applications. An inhibit function is provided on MHE Series converters to allow power shutdown and startup from a logic input. The unit is inhibited when the inhibit input pin (pin 2) is connected to the input common (pin 10). The open circuit voltage of the inhibit pin is 8 to 10 VDC for 12 V input models or 11 to 13 VDC for 28 V input models. During inhibit, the input inhibit pin must sink approximately 1 mA. In the inhibit mode, converter output drops to less than 1 V and the input current is typically 8 mA. Automatic current limiting circuitry protects the MHE Series converters against short circuits. MHE Series converters are rated to operate at full load up to a case temperature of 85°C, with the output power derated linearly to zero at 115°C. Because of the unit’s high efficiency, heat sinking requirements are minimized, but due consideration should be given to removing self-generated heat when operating the device at maximum ratings. To increase dissipation, heat conducting material (PCB, copper sheet, heat sink, etc.) should be brought into contact with the converter’s baseplate. When the MHE Series converters are used in applications requiring full power operation for extended periods of time, or in shock and vibration environments, it is highly recommended that the flangemount option be used. This option provides improved thermal transfer capabilities as well as a mechanically secure mounting configuration. 1 MHE SERIES 20 WATT DC/DC CONVERTERS INHIBIT ABSOLUTE MAXIMUM RATINGS TYPICAL CHARACTERISTICS Inhibit TTL Open Collector • Logic low (output disabled) Logic low voltage ≤0.8 V • Referenced to input common • Logic high (output enabled) Open collector Output Power • 10 to 20 watts depending on model Lead Soldering Temperature (10 sec per lead) • 300°C Storage Temperature Range (Case) • –55°C to +125°C RECOMMENDED OPERATING CONDITIONS Input Voltage Range Continuous • 17 to 40 VDC MHE28XXX • 10 to 16 VDC MHE12XXX Transient • 50 V for 50 msec on 28 V input models Case Operating Temperature (Tc) • –55°C to +85°C full power Derating Output Power/Current • Linearly from 100% at 85°C to 0% at 115° C • MHE28XXX models derate by 33% at 16 Vin Output Voltage Temperature Coefficient • 150 ppm/°C, typical Input to Output Capacitance • 60 pF, typical Current Limit • 125% of full load, typical Isolation • 100 megohm minimum at 500 V Conversion Frequency • 125 kHz, typical Inhibit Pin Voltage (unit enabled) • 11 to 13 V MHE28XXX • 8 to 10 V MHE12XXX Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. SINGLE OUTPUT MHE12XX MODELS PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT OUTPUT POWER OUTPUT RIPPLE VOLTAGE CONDITION MHE1212S MHE1215S –55°C TO +85°C TYP 5.00 — MAX 5.05 3 MIN 11.88 — TYP 12.00 — MAX 12.12 1.25 MIN 14.85 — TYP 15.00 — –55°C TO +85°C — — 15 — — 15 — — MAX UNITS 15.15 VDC 1.0 A 15 W 0 TO 1 MHz — 35 70 — 35 70 — 35 70 mV p-p LINE REGULATION VIN MIN TO MAX — 2 5 — 3 10 — 3 10 mV LOAD REGULATION INPUT VOLTAGE NO LOAD TO FULL CONTINUOUS TRANSIENT 50 ms — 10 — 10 12 — 20 16 — — 10 — 5 12 — 15 16 — — 10 — 10 12 — 20 16 — mV VDC V NO LOAD — — 24 — — 32 — — 32 mA 10 kHz – 2 MHz — 78 30 81 80 — — 79 30 82 80 — — 80 30 83 80 — mA p-p % INPUT CURRENT INPUT RIPPLE CURRENT EFFICIENCY Note: 1. Guaranteed by design, not tested. 2 MHE1205S MIN 4.95 — MHE SERIES 20 WATT DC/DC CONVERTERS Electrical Characteristics: 25°C Tc, 28 VDC Vin (12 Vin for 12 V models), 100% load, unless otherwise specified. SINGLE AND DUAL MHE28XX MODELS PARAMETER CONDITIONS OUTPUT VOLTAGE OUTPUT CURRENT2 –55 TO +85°C OUTPUT POWER2 OUTPUT RIPPLE VOLTAGE LINE REGULATION LOAD REGULATION INPUT VOLTAGE INPUT CURRENT INPUT RIPPLE CURRENT EFFICIENCY MHE2805S MHE2812S MHE2815S MHE2812D MHE2815D MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.15 ±11.88 ±12.00 ±12.12 ±14.85 ±15.00 ±15.15 — — 3.0 — — 1.67 — — 1.33 — — ±0.63 — — ±0.5 UNITS VDC A –55 TO +85°C — — 15 — — 20 — — 20 — — 15 — — 15 W 0 - 1 MHz VIN MIN TO MAX — — 35 2 60 10 — — 60 3 80 10 — — 30 3 60 10 — — 30 3 50 12 — — 30 3 50 15 mV p-p mV NO LOAD TO FULL CONTINUOUS TRANSIENT 50 ms NO LOAD — 17 — — 10 28 — — 20 40 50 18 — 17 — — 5 28 — — 15 40 50 30 — 17 — — 5 28 — — 15 40 50 30 — 17 — — 5 28 — — 15 40 50 35 — 17 — — 5 28 — — 15 40 50 35 mV VDC V mA 10 kHz - 2 MHz — 78 20 81 50 — — 79 25 82 50 — — 80 25 83 50 — — 76 25 79 50 — — 76 25 79 50 — mA p-p % Note 1. Guaranteed by design, not tested. 2. On dual output models at least 25% of the load should be on the positive output. 3 MHE SERIES 20 WATT DC/DC CONVERTERS PIN OUT Pin 1 2 3 4 5 6 7 8 9 10 Single Output Positive Input Inhibit Output Adjust Output Common Positive Output No connection No connection Case Ground No connection Input Common Dual Output Positive Input Inhibit Positive Output Output Common Negative Output No connection No connection Case Ground No connection Input Common Squared corner and dot on top of cover indicate pin one. 1 2 3 4 5 7 6 BOTTOM VIEW MHE 10 9 8 Dotted line outlines flanged package option. See Section B8, case H6 and K7 for dimensions. FIGURE 1: PIN OUT MODEL NUMBERING KEY MHE 28 12 S F / ES Base Model Input Voltage Output Voltage Number of Outputs (S = single, D = dual) Case Option (Non-flanged case has no designator in this position) Screening (Standard screening has no designator in this position.) OUTPUT ADJUSTMENT RESISTOR VALUES FOR MHE2805S AND MLP2805S Resistance Pin 3 to 4 ∞ 390K 145K 63K 22K 0 Output Voltage Increase (%) 0 +1% +2% +3% +4% +5% Output Adjustment all single output models: The output can be adjusted upward by using the output adjust (pin3). The resistance between output adjust (pin 3) and output common (pin 4) will determine the magnitude of the increase in the output. The table above is applicable only to MHE2805S. 4 MHE Series Rev D 20060630 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. MHE Series is a trademark of Interpoint Corporation. Copyright © 1995 - 2006 Interpoint Corporation. All rights reserved. CASES Dot on top of case indicates pin one CASE H BOTTOM VIEW See Figures 29 – 34 for pin configurations. 1.125 max (28.58) 2.125 max (53.98) 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 H Materials Header Cold Rolled Steel/Nickel/Gold cases H1 and H2 Cold Rolled Steel/Nickel/Tin cases H3, H4, and H5 Cover Kovar/Nickel cases H1 and H2 Cold Rolled Steel/Nickel/Tin cases H3, H4, and H5 Pins #52 alloy ceramic seal case H1 case H2 (except MHV Series Single and Dual) compression glass seal MHV Series Single and Dual case H3, H4, H5 Case dimensions in inches (mm) Tolerance ±0.005 (0.13) for three decimal places ±0.01 (0.3) for two decimal places unless otherwise specified FIGURE 28: CASE H MAXIMUM DIMENSIONS BOTTOM VIEW CASE H1 FMC EMI Filter: Screening – Standard, ES, or 883 SFMC EMI Filter: Screening – Space Standard, H, or K Seam Seal Squared corner and dot on top of case indicate pin one. 0.040 dia (1.02) 1.110 (28.19) 0.955 (24.26) 1 2 3 0.555 (14.1) 5 4 0.155 (3.94) 2.090 (53.01) 1.845 (46.86) 0.245 (6.22) 0.000 0.25 ±0.03 (6.4 ±0.8) 0.000 0.400 max. (10.16) 0.000 FIGURE 29: CASE H1 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. B8-17 CASES CASE H BOTTOM VIEW CASE H5 FMA-461and FMB-461 EMI Filter: Screening – Standard of ES Squared corner and dot on top of case indicate pin one. Solder Seal 1.120 (28.45) 0.960 (24.38) 1 0.040 dia (1.02) 2 3 0.560 (14.22) Solder Tip-off 5 4 0.160 (4.06) 2.110 (53.59) 1.855 (47.12) 0.255 (6.48) 0.000 0.25 +0.05/-0.00 (6.4 +1.3/-0.0) 0.495 max (12.57) 0.000 0.000 FIGURE 33: CASE H5 BOTTOM VIEW CASE H6 MHE Series: Screening – Standard or ES HR151 Series and HR152 Series: no screening options Dot on top of case indicates pin one Solder Seal 1.120 (28.45) 1 2 3 4 5 10 9 8 7 6 0.655 (16.64) 1.055 (26.80) 0.040 dia (1.02) 0.255 (6.48) 0.960 (24.38) Solder Tip-off 0.160 (4.06) 2.110 (53.59) 1.855 (47.12) 1.455 (36.96) 0.000 0.25 +0.05/-0.00 (6.4 +1.3/-0.0) 0.000 0.495 max (12.57) 0.000 FIGURE 34: CASE H6 B8-21 CASE K CASES Dot on top of case indicates pin one CASE K BOTTOM VIEW See Figures 42 - 48 for pin configuration 1.125 max (28.58) 2.910 max (73.91) Flange Thickness: Cases K1, K2, K3 and MLP Series (K5) 0.060 (1.52) Cases K4, K5 (except MLP Series), K6, K7, and K8 0.067 +0.005/-0.007 (1.70 +0.13/-0.8) Materials Header Case K1 - K3 Cold Rolled Steel/Nickel/Gold Cases K4 - K8 Cold Rolled Steel/Nickel/Tin Cover Case K1 - K3 Kovar/Nickel Case K4 - K8 Cold Rolled Steel/Nickel/Tin Pins #52 alloy (all cases) Case K1, K2, and K3 (except MHV Series Single and Dual) ceramic seal Cases K4 - K8 and MHV Series Single and Dual (K3) 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 41: CASE K MAXIMUM DIMENSIONS B8-26 CASES CASE K BOTTOM VIEW CASE K6 Flanged cases: Designator required in Case Option position of model number. FMA-461 and FMB-461 EMI Filters: Screening – Standard or ES Squared corner and dot on top of case indicate pin one. Solder Seal 1.115 (28.32) 0.955 (24.26) 1 0.040 dia (1.02) 2 0.162 dia (4.11) 3 0.555 (14.1) Solder Tip-off 5 4 0.155 (3.94) 2.320 (58.93) 2.090 (53.01) 1.845 (46.86) 0.245 (6.22) 0.000 0.230 (5.84) 0.25 ±0.03 (6.4 ±0.8) 0.495 max (12.57) 0.000 0.000 FIGURE 47: CASE K6 BOTTOM VIEW CASE K7 Flanged case: Designator required in Case Option position of model number. MHE Series: Screening – Standard or ES Squared corner and dot on top of case indicate pin one. Solder Seal 1.115 (28.32) 1 2 3 4 5 10 9 8 7 6 0.245 (6.22) 0.645 (16.38) 1.045 (26.54) 1.445 (36.70) 0.955 (24.26) 0.040 dia (1.02) 0.555 (14.1) Solder Tip-off 0.155 (3.94) FIGURE 48: CASE K7 B8-30 2.320 (58.93) 1.845 (46.86) 0.000 – 0.230 (5.84) 0.25 ±0.03 (6.4 ±0.8) 0.000 0.495 max (12.57) 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 Series MRH Series MTO Series MSR Series FM/FMA/FMB EMI Filters MSF EMI Filter C2-12