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| FEATURES * -55 to +125C operation * 16 to 40 VDC input (19 to 40 VDC for 15 volt outputs) * Fully Isolated * Optocoupler feedback * Fixed frequency 600 kHz typical * Forward converter topology * 50 V for up to 50 ms transient protection * Inhibit function * Indefinite short circuit protection * Up to 83% efficiency, 22 W/in3 DC/DC CONVERTERS 28 VOLT INPUT MHF SERIES 12 WATT MODELS VDC OUTPUT SINGLE 5 12 15 DUAL 12 15 Size (max.): 1.460 x 1.130 x 0.330 inches (37.08 x 28.70 x 8.38 mm) See Section B8, case E1 for dimensions. Weight: 21 grams typical. Screening: Standard or ES. See section C2 for screening options. DESCRIPTION The MHF SeriesTM of DC/DC converters offer up to 12 watts of power from single or dual outputs in a single package over a the full military temperature range. Thick film hybrid manufacturing technology produces high levels of miniaturization, giving the MHF Series converters a low profile (0.330 inch), small board area (1.65 square inches), and high power density (22 watt/in3). The parts are packaged in hermetically sealed steel enclosures, making them ideal for use in military, aerospace, and high reliability industrial applications. elements on both the input and output to help reduce the need for external components. For information about filtering to meet MILSTD-461's CE03 test, contact your Interpoint representative. WIDE VOLTAGE RANGE The MHF Series is designed to provide full power operation over the input voltage range of 16 to 40 volts. The 15 volt models provide a 19 to 40 volt range. Operation below 16 volts (or 19 volts for the 15 volt models), including operation in MIL-STD-704E emergency power conditions, is possible with derated output power. Please refer to the low line drop-out graphs, Figures 9 and 10. DESIGN METHODOLOGY The MHF converters are switching regulators which use a quasisquare wave, single ended forward converter design with a nominal switching frequency of 600 kHz. Isolation between input and output circuits is provided with a transformer in the forward power loop and a temperature insensitive optical link in the feedback control loop. Output regulation is accomplished with constant frequency pulse width modulation. Both line and load regulation are typically within 10 mV. On dual output models, the positive output is independently regulated and the negative output is cross-regulated. Figures 7 and 8 illustrate what effects load changes have on the negative output. Indefinite short circuit protection and overload protection are provided by sensing output load current and restricting the output current to approximately 125% of full load output current. Since the output current is sensed in the secondary stage, the result is a predictable, constant output current control with no foldback characteristics. MHF converters are provided with internal filtering MILITARY TEMPERATURE RANGE The MHF Series provides full power operation at case temperatures from -55C up to +125C. All 12 and 15 volt models in both single and dual output configurations provide full power operation at +125C with derated power to 135C. The +5 volt model provides full power at 110C derated to 0% at 130C. Depending on operating levels, air flow, and ambient temperature; heat sinking may be required. INHIBIT FEATURE An inhibit terminal is provided that can be used to disable internal switching, resulting in a very low quiescent input current. An open collector TTL compatible low (0.8V) is required to control the inhibit function. This level may be supplied by an open collector gate since the inhibit pin is provided with an internal pull-up resistor. B2-77 MHF SERIES 12 WATT ABSOLUTE MAXIMUM RATINGS Input Voltage * 16 to 40 VDC (19 to 40 VDC 15 volt output) Output Power * 12 watts (10 watts MHF2805S) Lead Soldering Temperature (10 sec per lead) * 300C Storage Temperature Range (Case) * -55C to +135C DC/DC CONVERTERS INHIBIT Inhibit TTL Open Collector * Logic low (output disabled) Logic low 0.8 V max Inhibit pin current 4 mA max * Referenced to input common * Logic high (output enabled) Open collector TYPICAL CHARACTERISTICS Output Voltage Temperature Coefficient * 150 ppm/C, typical Input to Output Capacitance * 50 pF, typical Current Limit * 125% of full load, typical Isolation * 100 megohm minimum at 500 V Conversion Frequency * 600 kHz typical Inhibit Pin Voltage (unit enabled) * 8 to 11 V RECOMMENDED OPERATING CONDITIONS Input Voltage Range * 16 to 40 VDC continuous * 19 to 40 VDC 15 volt outputs continuous * 50 V for 50 msec transient Case Operating Temperature (Tc) * -55C to +125C full power * -55C to +110C full power for MHF2805S * -55C to +135C absolute * -55C to +130C absolute for MHF2805S Derating Output Power/Current * Linearly from 100% at 125C to 0% at 135C * Linearly from 100% at 110C to 0% at 130C for MHF2805S 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 REGULATION INPUT VOLTAGE MIN. TO MAX. VIN 10 kHz to 2 MHz MIN. TO MAX. VIN NO LOAD TO FULL CONTINUOUS TRANSIENT 50 ms INPUT CURRENT NO LOAD FULL LOAD INHIBITED INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT1 POWER DISSIPATION OVERLOAD SHORT CIRCUIT START-UP DELAY -- -- -- -- - 180 5 3.5 300 -- -- -- -- -- 80 5 2.8 200 -- -- -- -- -- 150 5 2 250 ms W 10 kHz TO 2 MHz -- 74 135 77 180 -- -- 77 150 81 200 -- -- 80 150 83 220 -- mA p-p % CONDITIONS MIN 4.95 -- -- -- -- -- 16 -- -- -- -- MHF2805S TYP 5.0 -- -- 40 10 10 28 -- 20 -- 2 MAX 5.05 2.0 10 60 50 50 40 50 30 483 3 MIN 11.88 -- -- -- -- -- 16 -- -- -- -- MHF2812S TYP 12 -- -- 30 10 10 28 -- 20 -- 2 MAX 12.12 1.0 12 60 50 50 40 50 30 557 3 MHF2815S MIN 14.85 -- -- -- -- -- 19 -- -- -- -- TYP 15 -- -- 25 10 10 28 -- 20 -- 2 MAX 15.15 0.8 12 50 50 50 40 50 30 535 3 mA UNITS VDC A W mV p-p mV mV VDC V Notes 1. Indefinite short circuit protection not guaranteed above 125C case temperature (110C case for MHF2805S). B2-78 DC/DC CONVERTERS DUAL OUTPUT MODELS PARAMETER OUTPUT VOLTAGE CONDITION +VOUT - VOUT OUTPUT CURRENT1, 2 OUTPUT POWER2 +VOUT - VOUT TOTAL OUTPUT RIPPLE VOLTAGE LINE REGULATION MIN. TO MAX. VIN LOAD REGULATION NO LOAD TO FULL CROSS REGULATION +VOUT 20% TO 80% LOAD3 50% LOAD4 INPUT VOLTAGE NO LOAD TO FULL INPUT CURRENT CONTINUOUS TRANSIENT 50 ms NO LOAD FULL LOAD INHIBITED 10 kHz TO 2 MHz -- -- -- 16 -- -- -- -- -- 78 POWER DISSIPATION SHORT CIRCUIT OVERLOAD START-UP DELAY -- -- -- -- -- 150 2.8 5 250 -- -- -- -- -- 150 2 5 250 ms W 5 5 4 28 -- 25 -- 1.9 175 81 50 10 5 40 50 35 550 3 240 -- -- -- -- 19 -- -- -- -- -- 80 10 4 3 28 -- 25 -- 1.9 175 83 50 8 5 40 50 35 536 3 240 -- VDC V mA mV % +VOUT -- 5 50 -- 5 50 mV 10 kHz TO 2 MHz MIN 11.88 11.82 -- -- -- -- -- MHF2812D TYP MAX 12.0 12.0 0.5 -- -- -- 30 12.12 12.18 1.0 10.8 10.8 12 60 MIN MHF2815D TYP MAX 15.0 15.0 0.4 -- -- -- 30 15.15 15.23 0.8 10.8 10.8 12 60 mV p-p W A UNITS VDC 14.85 14.77 -- -- -- -- -- MHF SERIES 12 WATT Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, unless otherwise specified. INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT5 mA p-p % Notes 1. Applies to both outputs. 2. Maximum combined output power is 12 watts. A maximum of 90% is available from either output. 3. 20% to 80% load on the positive output and 80% to 20% on the negative output. See Figure 8. 4. 50% load on the positive output and 50% to 20% load on the negative output. 50% load on the negative output and 50% to 20% load on the positive output. See Figure 7. 5. Indefinite short circuit protection not guaranteed above 125C case temperature. PIN OUT Pin 1 2 3 4 5 6 7 8 Single Output Inhibit No connection Output Common Positive Output No connection Case Ground Input Common Positive Input Dual Output Inhibit Positive Output Output Common Negative Output No connection Case Ground Input Common Positive Input Squared corner and dot on top of cover indicate pin one. MODEL NUMBER KEY MHF Base Model Input Voltage Output Voltage Number of Outputs (S = single, D = dual) Screening (Standard screening has no designator in this position.) 28 12 D / ES 1 2 3 4 5 BOTTOM VIEW MHF 8 7 6 See Section B8, case E1, for dimensions. FIGURE 1: PIN OUT B2-79 MHF SERIES 12 WATT 90 DC/DC CONVERTERS 90 16V Typical Performance Curves: 25C Tc , 28 VDC Vin, 100% load, unless otherwise specified. 90 19V 80 16V 80 80 Efficiency (%) Efficiency (%) 40V 70 28V 60 70 40V 28V Efficiency (%) 40V 70 28V 60 60 50 2 4 6 8 10 12 14 50 2 4 6 8 10 12 14 50 2 4 6 8 10 12 14 Output Power (Watts) Output Power (Watts) Output Power (Watts) MHF2805S Efficiency MHF2812S Efficiency MHF2815S Efficiency FIGURE 2 90 16V FIGURE 3 90 FIGURE 4 Negative Output Voltage Change (%) 10 8 6 4 2 0 2 -4 -6 -8 -10 0 10 2 30 40 50 2812D 2815D 2812D 19V 80 80 40V Cond. A Efficiency (%) Efficiency (%) 40V 70 28V 70 28V 60 60 Cond. B 50 50 2 4 6 8 10 12 14 2 4 6 8 10 12 14 Output Power (Watts) Output Power (Watts) MHF2812D Efficiency MHF2815D Efficiency Output Load (%) Condition A: 50% Load Pos. Vout, 50% to 20% Neg. Vout Condition B: 50% Load Neg. Vout, 50% to 20% Pos. Vout MHF Negative Output Voltage Cross Regulation FIGURE 5 20 19 18 FIGURE 6 19 18 2815S FIGURE 7 Negative Output Voltage Change (%) 15 Input Voltage (Volts) Input Voltage (Volts) 10 5 0 -5 -10 -15 -20 0 20 40 60 80 100 2812D 2815D 17 16 15 14 13 12 11 2 4 17 2815D 16 15 14 13 12 2812D 2812S 2805S 6 8 10 12 14 11 Output Load (%) Positive Output 20% to 80% Load Negative Output 80% to 20% Load 2 4 6 8 10 12 14 Output Power (Watts) 50 mV Drop Output Power (Watts) 50 mV Drop MHF Dual Negative Output Voltage Cross Regulation MHF Single Low Line Dropout MHF Dual Low Line Dropout FIGURE 8 FIGURE 9 FIGURE 10 B2-80 218211-001-DTS Rev A DQ# 1011 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. MHF Series is a trademark of Interpoint. Copyright (c) 1992 - 1999 Interpoint. All rights reserved. CASE E CASES Squared corner and dot on top of case indicate pin one. Materials Header Cold Rolled Steel/Nickel/Gold Cover Kovar/Nickel (SMHF Series Cold Rolled Steel/Nickel/Gold) Pins #52 alloy/Gold compression glass seal 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 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. CASE E BOTTOM VIEW See Figures 16 - 18 for pin configurations. 1.130 max (28.70) 1.460 max (37.08) FIGURE 15: CASE E MAXIMUM DIMENSIONS BOTTOM VIEW CASE E1 MHF+ Series Single and Dual: Screening - Standard, ES, or 883 MHF Series and LIM5050 Module: Screening - Standard or ES SMHF Series Single and Dual and SLIM5050 Module: Screening - Space Standard, H, or K HR120 Series: No screening options Seam Seal Projection Weld Squared corner and dot on top of case indicate pin one. 0.960 (24.38) 0.030 dia. (0.76) 1 2 3 4 5 0.160 (4.06) 0.000 0.330 max (8.38) 0.000 0.25 (6.35) 0.25 (6.35) 0.330 max (8.38) 0.000 0.000 8 7 6 0.205 (5.21) FIGURE 16: CASE E1 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. B8-10 0.505 (12.83) 0.705 (17.91) 0.905 (22.99) 1.105 (28.07) QA SCREENING 125C PRODUCTS 125C PRODUCTS TEST (125C Products) PRE-CAP INSPECTION Method 2017, 2032 TEMPERATURE CYCLE (10 times) Method 1010, Cond. C, -65C to 150C Method 1010, Cond. B, -55C to 125C CONSTANT ACCELERATION Method 2001, 3000 g Method 2001, 500 g BURN-IN Method 1015, 160 hours at 125C 96 hours at 125C case (typical) FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 through 6: -55C, +25C, +125C 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 STANDARD /ES /883 (Class H)* yes yes yes no no no yes yes no no no no yes yes no no no no yes yes no no yes no yes yes no no no yes yes yes no yes yes no 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 -55C to +125C. Applies to the following products MOR Series MHD Series MFLHP Series MHV Series MFL Series MHF+ Series MHP Series MHF Series** MTR Series MGA Series MQO Series** MSA Series MGH Series MCH Series FM-704A EMI Filter FMD**/FME EMI Filter FMC EMI Filter FMH EMI Filter FMGA EMI Filter FMSA EMI Filter HUM Modules** LCM Modules** LIM Modules **MFLHP Series, MQO Series, MHF Series, FMD EMI Filters, Hum Modules, and LCM Modules do not offer `883" screening. C2-10 |
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