FEATURES • • • • • • • • • • • DC/DC CONVERTERS 28 VOLT INPUT –55° to +125°C operation 16 to 40 VDC input Fully isolated Optocoupler feedback Fixed frequency, 550 kHz typical Topology – Single Ended Forward 50 V for up to 50 ms transient protection Inhibit and sync functions Indefinite short circuit protection Undervoltage lockout Up to 84% efficiency, 28 W/in3 MHF+ SERIES SINGLE & DUAL 15 WATT MODELS Size (max.): Non flanged 1.460 x 1.130 x 0.330 (37.08 x 28.70 x 8.38 mm) Flanged 2.005 x 1.130 x 0.330 (50.93 x 28.70 x 8.38 mm) Weight: 30 grams maximum. Screening: Standard, ES, or 883 (Class H). VDC OUTPUT SINGLE DUAL 3.3 ±5 5 ±12 5.2 ±15 12 15 28 DESCRIPTION The MHF+ Series™ of high frequency DC/DC converters offers a wide input voltage range of 16 to 40 volts and up to 15 watts of output power. The units are capable of withstanding short term transients up to 50 volts. The package is a hermetically sealed, welded metal case. Flanged and non-flanged models are available. CONVERTER DESIGN The MHF+ converters are switching regulators that use a quasisquare wave, single-ended forward converter design with a constant switching frequency of 550 kHz. Isolation between input and output circuits is provided with a transformer in the forward path and a temperature compensated optical link in the feedback control loop. For the MHF+ dual output models, good cross regulation is maintained by tightly coupled output magnetics. Up to 90% of the total output power (80% on 2805D) is available from either output, providing the opposite output is simultaneously carrying 10% of the total output power (20% on 2805D models). Predictable current limit is accomplished by directly monitoring the output load current and providing a constant current output above the overload point. HIGHER POWER DENSITY INHIBIT FUNCTION MHF+ converters provide an inhibit terminal that can be used to disable internal switching, resulting in no output and very low quiescent input current. The converter is inhibited when a TTL compatible low (≤0.8 – output disabled) is applied to the inhibit pin. The unit is enabled when the pin, which is internally connected to a pull-up resistor, is left unconnected or is connected to an open-collector gate. The open circuit output voltage associated with the inhibit pin is 8.5 to 12 V. In the inhibit mode, a maximum of 4 mA must be sunk from the inhibit pin. SYNCHRONIZATION A synchronization feature is included with the MHF+ Series that allows the user to match the switching frequency of the converter to the frequency of the system clock. An external synchronization feature is included that allows the user to adjust the nominally 550 kHz operating frequency to any frequency within the range of 500 kHz to 600 kHz. This is initiated by applying a TTL compatible input of the desired frequency to pin 5. SHORT CIRCUIT PROTECTION The MHF+ Series offers a new standard of performance for small size and high power density. At just 0.33 inch high and a total footprint of 1.7 in2, this low profile package offers a total power density of up to 28 watts per cubic inch. MHF+ Series converters provide short circuit protection by restricting the output current to approximately 115% of the full load output current. The output current is sensed in the secondary stage to provide highly predictable and accurate current limiting, and to eliminate foldback characteristics. LOW NOISE, HIGH AUDIO REJECTION UNDERVOLTAGE LOCKOUT The MHF+ converters’ feed-forward compensation system provides excellent dynamic response and noise rejection. Audio rejection is typically 50 dB. Typical output voltage response for a 50% to 100% step load transient is as low as 1.3% with a 150 msec recovery time. Input ripple current is typically 35 mA p-p with output ripple voltage typically 30 mV p-p . Undervoltage lockout prevents the units from operating below approximately 12 VDC input voltage to keep system current levels smooth, especially during initialization or re-start operations. 1 MHF+ SERIES SINGLE AND DUAL 15 WATT DC/DC CONVERTERS ABSOLUTE MAXIMUM RATINGS TYPICAL CHARACTERISTICS SYNC AND INHIBIT Input Voltage • 16 to 40 VDC Power Dissipation (Pd) • 6W Output Power • 12 to 15 watts depending on model Lead Soldering Temperature (10 sec per lead) • 300°C Storage Temperature Range (Case) • –65°C to +150°C RECOMMENDED OPERATING CONDITIONS Sync In (500 to 600 kHz) • Duty cycle 40% to 60% • Logic low 0.8 V max • Logic high 4.5 V min, 5 V max • Referenced to input common • If not used, connect to input common Inhibit TTL Open Collector • Logic low (output disabled) Logic low voltage ≤0.8 V Inhibit pin current 4.0 mA max • Referenced to input common • Logic high (output enabled) Open collector or unconnected Output Voltage Temperature Coefficient • 100 ppm/°C typical • 150 ppm/°C maximum Input to Output Capacitance • 60 pF typical Undervoltage Lockout • 12 V input typical Current Limit • 115% of full load typical Isolation • 100 megohm minimum at 500 V Audio Rejection • 50 dB typical Conversion Frequency (55°C to +125°C Tc) • Free run 550 kHz typical 480 kHz min, 620 kHz max Inhibit Pin Voltage (unit enabled) • 8.5 to 12 V Input Voltage Range • 16 to 40 VDC continuous • 50 V for up to 50 msec transient Case Operating Temperature (Tc) • –55°C to +125°C full power • –55°C to +135°C absolute Derating Output Power/Current (Tc) • Linearly from 100% at 125°C to 0% at 135°C Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified. SINGLE OUTPUT MODELS MHF+283R3S PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT CONDITION VIN = 16 to 40 VDC OUTPUT POWER MIN 3.27 0 TYP MAX 3.30 3.33 — 2.4 TYP MAX 5.00 5.05 — 2.4 MHF+285R2S MIN 5.16 0 TYP MAX 5.20 5.24 — 2.4 VIN = 16 to 40 VDC 0 — 8 0 — 12 0 — 12.48 OUTPUT RIPPLE VOLTAGE LINE REGULATION LOAD REGULATION INPUT VOLTAGE NO LOAD TO FULL 10 kHz - 2 MHz Tc = –55°C to +125°C Vin = 16 to 40 VDC NO LOAD TO FULL CONTINUOUS TRANSIENT 50 ms — — — — 16 — 30 50 5 20 28 — 80 120 100 50 40 50 — — — — 16 — 30 60 5 20 28 — 80 100 50 50 40 50 — — — — 16 — 30 60 5 20 28 — 50 100 35 35 40 50 INPUT CURRENT NO LOAD FULL LOAD INHIBITED 10 kHz - 10 MHz Tc = –55°C to +125°C — — — — — 72 25 — 5 45 — 75 65 397 12 80 120 — — — — — — 75 25 560 5 35 — 77 40 624 12 80 100 — — — — — — 75 25 560 5 35 — 77 42 605 12 100 100 — INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT1 STEP LOAD RESP. STEP LINE RESP. START-UP UNITS VDC A W mV p-p mV mV VDC V mA mA pp % SHORT CIRCUIT POWER DISSIPATION RECOVERY2 50% – 100% – 50% TRANSIENT RECOVERY2 — — 5 7.5 8 30 — — 3.5 7.5 6 30 — — 3.5 7.5 6 30 W ms –400 — 150 150 500 300 –400 — 150 150 400 300 –400 — 150 150 400 300 mV pk µs 16 – 40 – 16 VDC TRANSIENT3 RECOVERY2 –800 — 550 0.8 800 1.2 –800 — 550 0.8 800 1.2 –800 — 550 0.8 800 1.2 mV pk ms DELAY — 10 25 — 10 25 — 10 25 ms OVERSHOOT4 — 200 300 — 100 600 — 100 600 mV pk Notes 1. Indefinite short circuit protection not guaranteed above 125°C (case) 2. Recovery time is measured from application of the transient to the point at which Vout is within regulation. 2 MHF+2805S MIN 4.95 0 3. Input step transition time >10 µs. 4. Input step transition time <100 µs. MHF+ SERIES SINGLE AND DUAL 15 WATT DC/DC CONVERTERS Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified. SINGLE OUTPUT MODELS PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT CONDITION VIN = 16 to 40 VDC OUTPUT POWER MHF+2812S MHF+2815S MHF+2828S MIN TYP MAX 11.88 12.00 12.12 0 — 1.25 MIN TYP MAX 14.85 15.00 15.15 0 — 1.00 MIN TYP MAX 27.72 28.00 28.28 0 — 0.54 UNITS VDC A VIN = 16 to 40 VDC 0 — 15 0 — 15 0 — 15 OUTPUT RIPPLE VOLTAGE LINE REGULATION LOAD REGULATION INPUT VOLTAGE NO LOAD TO FULL 10 kHz - 2 MHz Tc = –55°C to +125°C Vin = 16 to 40 VDC NO LOAD TO FULL CONTINUOUS TRANSIENT 50 ms — — — — 16 — 30 50 5 20 28 — 80 120 50 50 40 50 — — — — 16 — 30 50 5 20 28 — 80 120 50 50 40 50 — — — — 16 — 60 100 50 50 28 — 120 180 150 150 40 50 INPUT CURRENT NO LOAD FULL LOAD INHIBITED 10 kHz - 10 MHz Tc = –55°C to +125°C — — — — — 25 680 5 35 — 50 752 12 80 120 — — — — — 25 670 5 35 — 62 752 12 80 120 — — — — — 25 640 5 35 — 60 760 12 80 120 78 79 — 78 80 — 82 84 — % INPUT RIPPLE CURRENT EFFICIENCY LOAD FAULT1 STEP LOAD RESP. STEP LINE RESP. START-UP W mV p-p mV mV VDC V mA mA pp SHORT CIRCUIT POWER DISSIPATION RECOVERY2 50% – 100% – 50% TRANSIENT RECOVERY2 — — 3.5 7.5 6 30 — — 3.5 7.5 6 30 — — 3.5 7.5 6 30 W ms –500 — 150 150 500 300 –600 — 200 150 600 300 –800 — 600 200 800 400 mV pk µs 16 – 40 – 40 VDC TRANSIENT3 RECOVERY2 –800 — 550 0.8 800 1.2 –800 — 550 0.8 800 1.2 –1200 1100 1200 — 0.8 1.2 mV pk ms 25 0 10 25 0 200 1500 DELAY 0 10 OVERSHOOT4 0 200 1200 Notes 1. Indefinite short circuit protection not guaranteed above 125°C (case) 2. Recovery time is measured from application of the transient to point at which Vout is within regulation. 0 10 25 ms 0 200 280 mV pk 3. Input step transition time >10 µs. 4. Input step transition time <100 µs. 3 MHF+ SERIES SINGLE AND DUAL 15 WATT DC/DC CONVERTERS Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified. DUAL OUTPUT MODELS PARAMETER MHF+2805D CONDITIONS OUTPUT VOLTAGE MHF+2812D TYP MAX MIN TYP MAX MIN TYP MAX +VOUT 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.15 –VOUT 4.92 5.00 5.08 11.82 12.00 1218 14.78 15.00 15.23 UNITS VDC OUTPUT CURRENT1 VIN = 16 to 40 VDC — ±1.2 1.92 — ±0.625 1.125 — ±0.500 0.900 A OUTPUT POWER1 VIN = 16 to 40 VDC — — 12 — — 15 — — 15 W OUTPUT RIPPLE VOLTAGE ±VOUT 10 kHz - 2 MHz Tc = –55°C to +125°C — — 30 60 80 120 — — 30 60 80 120 — — 30 50 80 120 mV p-p LINE REGULATION BALANCED +VOUT Vin = 16 to 40 VDC LOAD REGULATION — 5 50 — 5 50 — 5 50 –VOUT — — 80 — — 100 — — 100 BALANCED +VOUT — 20 50 — 20 50 — 20 50 — — 100 — — 100 — — 100 LOAD LOAD CROSS REGULATION2 –VOUT mV mV NEGATIVE VOUT — 6 7.5 — 3 6 — 3 6 % CONTINUOUS TRANSIENT 50 msec NO LOAD FULL LOAD INHIBITED 10 kHz - 10 MHz 16 — — — — — 28 — 20 540 6 20 40 50 40 600 12 50 16 — — — — — 28 — 25 645 5 35 40 50 50 754 12 60 16 — — — — — 28 — 25 638 5 35 40 50 50 754 12 60 VDC V CURRENT EFFICIENCY Tc = –55°C to +125°C — 77 40 79 80 — — 76 50 83 100 — — 76 50 84 100 — LOAD FAULT SHORT CIRCUIT3 POWER DISSIPATION RECOVERY4 50% – 100% – 50% +VOUT TRANSIENT –VOUT — — 3 7.5 6 30 — — 3 7.5 6 50 — — 3 7.5 6 50 –600 200 600 –600 300 600 –600 300 600 –600 150 600 –600 100 500 –600 100 600 INPUT VOLTAGE NO LOAD TO FULL INPUT CURRENT INPUT RIPPLE STEP LOAD RESP.5 BALANCED LOADS STEP LINE RESP. ± VOUT START-UP mA mA p-p % W ms mV pk RECOVERY4 16 – 40 – 40 VDC TRANSIENT6 — 150 500 — 200 400 — 200 500 µs –800 600 800 –750 550 750 –750 550 750 mV pk RECOVERY4 DELAY OVERSHOOT7 — — 0 0.8 12 100 1.2 20 250 — — 0 0.8 12 200 1.2 25 750 — — 0 0.8 12 200 1.2 25 750 ms ms mV pk Notes 1. Up to 13.5 watts, 90% (9.6W, 80% for 2805D) of the total output power is available from either output providing the opposite output is simultaneously carrying 10% (20% for 2805D) of the total output power. Each output must carry a minimum of 10% (20% for 2805D) of the total output power in order to maintain regulation on the negative output. 2. Effect on –Vout for the following conditions: +Po = 50% to 10% and –Po = 50% +Po = 50% and –Po = 50% to 10% 4 MHF+2815D MIN 3. Indefinite short circuit protection not guaranteed above 125°C (case) 4. Recovery time is measured from application of the transient to point at which Vout is within regulation. 5. Response of either output with the opposite output held at half of the total output power. 6. Input step transition time >10 µs. 7. Input step transition time <100 µs. MHF+ SERIES SINGLE AND DUAL 15 WATT DC/DC CONVERTERS BLOCK DIAGRAM 5 µH Positive Input Positive Output 2 µF Inhibit PWM Controller ID Limit Ref. IC Output Common Input Common FIGURE 1: MHF+ SINGLE OUTPUT 5 MHF+ SERIES SINGLE AND DUAL 15 WATT DC/DC CONVERTERS PIN OUT Pin 1 2 3 4 52 6 7 8 Single Output (Except MHF+2828S) Inhibit No connection Output Common Positive Output Sync Case Ground Input Common Positive Input MHF+2828S Dual Output Inhibit Positive Output (See note 1, below) Output Common Sync Case Ground Input Common Positive Input Inhibit Positive Output Output Common Negative Output Sync Case Ground Input Common Positive Input 1. Pin 3 of MHF+2828S will provide 14 Vout referenced to output common (pin 4). 2. If Sync is not used, pin 5 should be connected to input common. Dot on top of cover indicates pin one. 1 2 3 4 5 BOTTOM VIEW MHF+ SINGLE AND DUAL NON-FLANGED OR FLANGED 8 7 6 Dotted line outlines flanged package option. See pages 9 and 10 for dimensions. FIGURE 2: PIN OUT SMD NUMBERS MODEL NUMBERING KEY MHF+ 28 12 D F / 883 Base Model Input Voltage Output Voltage (R = decimal point, 3R3 = 3.3 Vout) 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.) 6 STANDARD MICROCIRCUIT DRAWING (SMD) IN PROCESS 5962-9213901HXC IN PROCESS 5962-9166401HXC 5962-9160101HXC 5962-9689801HXC 5962-9555901HXC 5962-9214401HXC 5962-9161401HXC MHF+ SIMILAR PART MHF+283R3S/883 MHF+2805S/883 MHF+285R2S/883 MHF+2812S/883 MHF+2815S/883 MHF+2828S/883 MHF+2805D/883 MHF+2812D/883 MHF+2815D/883 Flanged SMDs have the suffix HZC instead of HXC. For exact specifications for an SMD product, refer to the SMD drawing. Call your Interpoint representative for status on the MHF+ SMD releases which are “in process”. SMDs can be downloaded from http://www.dscc.dla.mil/programs/smcr DC/DC CONVERTERS MHF+ SERIES SINGLE AND DUAL 15 WATT Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified. 90 90 40V 28V 60 50 70 40V 60 50 2 4 6 8 10 40 12 2 OUTPUT POWER (Watts) 4 6 8 10 12 40 14 15 4 6 16V EFFICIENCY (%) EFFICIENCY (%) 28V 70 40V 60 28V 40 4 6 8 10 12 70 40V 60 28V 50 50 50 14 15 80 80 40V 12 90 16V 70 10 FIGURE 5 90 80 8 OUTPUT POWER (Watts) MHF+2815S EFFICIENCY 16V 2 2 MHF+2812S EFFICIENCY FIGURE 4 90 EFFICIENCY (%) 40V 28V 60 OUTPUT POWER (Watts) FIGURE 3 40 70 50 MHF+2805S EFFICIENCY 60 16V 80 28V EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 80 70 40 90 16V 16V 80 40 2 4 6 8 10 12 14 15 2 4 6 8 10 12 14 OUTPUT POWER (Watts) OUTPUT POWER (Watts) OUTPUT POWER (Watts) MHF+2805D EFFICIENCY MHF+2812D EFFICIENCY MHF+2815D EFFICIENCY FIGURE 8 FIGURE 7 FIGURE 6 0 –30 –40 –50 VOUT 100% to 50% 100mV/div. 500mV/div. –20 –60 50% to 100% –70 20V/div. ATTENUATION (dB) –10 –80 –90 –100 0.1 1 10 FREQUENCY (kHz) MHF+ SERIES AUDIO REJECTION FIGURE 9 100 VIN 1ms/div 16V TO 40V MHF+2805S STEP LINE RESPONSE FIGURE 10 50µs/div 50% 100% MHF+2805S STEP LOAD RESPONSE FIGURE 11 7 MHF+ SERIES SINGLE AND DUAL 15 WATT DC/DC CONVERTERS 20V/div. Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified. 200mV/div. VIN 100mV/div. 100% to 10% +VOUT 1V/div. 200µs/div 10% 100% MHF+2805S STEP LOAD RESPONSE VIN 2 ms/div 1 ms/div 16V TO 40V MHF+2805S TURN-ON INTO FULL LOAD MHF+2815D STEP LINE RESPONSE FIGURE 14 FIGURE 13 FIGURE 12 100% to 50% POUT= 12W VOUT 20V/div. 10% to 100% PO= 7.5 W PO= 7.5 W –VOUT 100mV/div. 100mV/div. 5V/div. 100% to 20% +VOUT 20V/div. 20% to 100% 50% to 100% 50µs/div 50% 100% MHF+2815D +VOUT STEP LOAD RESPONSE 50µs/div 20% 100% MHF+2815D +VOUT STEP LOAD RESPONSE FIGURE 15 VIN 2 ms/div MHF+2815D TURN-ON INTO FULL LOAD FIGURE 17 FIGURE 16 10 5 2812D 2815D 0 –5 –10 2805D 0 20 40 60 80 100 POSITIVE OUTPUT LOAD (% OF TOTAL LOAD) –VOUT WITH SHIFT IN LOAD BALANCE CROSS REGULATION 2805D 8 16 6 MHF+2805S&D 2812D 4 COND A 2 0 2815D –2 COND B –4 2812D –6 –8 –10 INPUT VOLTAGE (Volts) –VOUT VOLTAGE CHANGE (%) –V OUT VOLTAGE CHANGE (%) 10 15 14 MHF+2812S&D MHF+2815S&D 13 2805D 10 20 30 40 50 OUTPUT LOAD (%) COND. A: 50% LOAD +V; 50% to 10% –V COND. B: 50% LOAD –V; 50% to 10% +V 12 10 11 12 13 8 FIGURE 19 15 LOW LINE DROPOUT VS. LOAD MHF+2805D/MHF+2812D/MHF+2815D CROSS REGULATION FIGURE 18 14 OUTPUT POWER (Watts) 50 mV DROP FIGURE 20 MHF+ SERIES SINGLE AND DUAL 15 WATT DC/DC CONVERTERS Squared corner and dot on top of case indicate pin one. CASE E BOTTOM VIEW See Figure 22 for pin configurations. 1.130 max (28.70) 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 1.460 max (37.08) 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 21: CASE E MAXIMUM DIMENSIONS BOTTOM VIEW CASE E1 MHF+ Series Single and Dual: Screening – Standard, ES, or 883 Seam Seal Projection Weld Squared corner and dot on top of case indicate pin one. 0.960 (24.38) 1 2 3 4 5 0.030 dia. (0.76) 0.205 (5.21) 0.000 0.25 (6.35) 0.000 0.330 max (8.38) 0.25 (6.35) 0.000 0.330 max (8.38) 7 6 0.505 (12.83) 0.705 (17.91) 0.905 (22.99) 1.105 (28.07) 8 0.160 (4.06) 0.000 FIGURE 22: 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. 9 MHF+ SERIES SINGLE AND DUAL 15 WATT DC/DC CONVERTERS Squared corner and dot on top of case indicate pin one. CASE G BOTTOM VIEW Flanged package See Figure 24 for pin configuration 1.130 max (28.70) Materials Header Cold Rolled Steel/Nickel/Gold Cover MHF+ Series and FMH Filter Kovar/Nickel SMHF Cold Rolled Steel/Nickel Pins #52 alloy (all cases) 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 2.005 max (50.93) 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: 0.047 (1.19) FIGURE 23: CASE G MAXIMUM DIMENSIONS 10 MHF+ SERIES SINGLE AND DUAL 15 WATT DC/DC CONVERTERS BOTTOM VIEW CASE G1 Flanged cases: Designator "F" required in Case Option position of model number MHF+ Series Single and Dual: Screening – Standard, ES, or 883 Projection Weld Squared corner and dot on top of case indicate pin one. 0.960 (24.38) 1 4 5 0.128 dia (3.25) 1.590 (40.39) 1.105 (28.07) 6 0.905 (22.99) 0.000 7 0.705 (17.91) 8 0.140 (3.56) 0.25 (6.35) 0.000 0.330 max. (8.38) 0.25 (6.35) 0.000 3 0.560 (14.22) 0.160 (4.06) 0.000 0.330 max. (8.38) 2 0.505 (12.83) 0.030 dia. (0.76) 0.205 (5.21) Seam Seal FIGURE 24: CASE G1 11 MHF+ SERIES SINGLE AND DUAL 15 WATT DC/DC CONVERTERS TABLE 1: ENVIRONMENTAL SCREENING TEST STANDARD /ES /883 (Class H)* yes yes yes PRE-CAP INSPECTION Method 2017, 2032 TEMPERATURE CYCLE (10 times) Method 1010, Cond. C, -65°C to 150°C no no yes Method 1010, Cond. B, -55°C to 125°C no yes no CONSTANT ACCELERATION Method 2001, 3000 g no no yes Method 2001, 500 g no yes no BURN-IN Method 1015, 160 hours at 125°C no no yes 96 hours at 125°C case (typical) no yes no FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 through 6: -55°C, +25°C, +125°C no no yes Subgroups 1 and 4: +25°C case yes yes no HERMETICITY TESTING Fine Leak, Method 1014, Cond. A no yes yes Gross Leak, Method 1014, Cond. C no yes yes Gross Leak, Dip (1 x 10-3) yes no no yes yes yes FINAL VISUAL INSPECTION Method 2009 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 –55°C to +125°C. Contact Information: www.interpoint.com Interpoint Headquarters USA Phone: 1-800-822-8782 +425-882-3100 Email: [email protected] Interpoint UK Phone: +44-1252-815511 Email: [email protected] 12 21621-001-DTS Rev B This revision supercedes all previous releases. 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 © 1999-2000 Interpoint. All rights reserved. Interpoint France Phone: +33-134285455 Email: [email protected] FEATURES • • • • • • • • • • • –55° to +125°C operation 16 to 48 VDC input Fully Isolated Optocoupler feedback Fixed frequency 450 kHz Topology – Current Mode Flyback Transient protection 80 V/120 ms Inhibit and sync functions Indefinite short circuit protection Undervoltage lockout Up to 76% efficiency DC/DC CONVERTERS 28 VOLT INPUT MHF+ SERIES TRIPLE 15 WATT MODELS VDC OUTPUT TRIPLE OUTPUT +5 and ±12 +5 and ±15 Size (max.): Non flanged, case E2, 1.460 x 1.130 x 0.330 inches (37.08 x 28.70 x 8.38 mm) Flanged , case G2, 2.005 x 1.130 x 0.330 inches (50.93 x 28.70 x 8.38 mm) See Figures 13 - 16 for dimensions. Weight: 32 grams maximum. Screening: Standard, ES, or 883 (Class H). See Table 1 for screening options. DESCRIPTION Interpoint’s MHF+ Series™ Triple DC/DC converters provide a wide input voltage range of 16 to 48 VDC delivering 15 watts of total output power with output voltages of +5 and ±12 or +5 and ±15 VDC. The main output, +5 VDC, will supply up to 7.5 watts and the auxiliaries will supply up to 7.5 watts of combined power. Full power operation at -55° C to +125°C plus the ability to withstand transients of up to 80 V for up to 120 milliseconds make these converters an ideal choice for your high reliability systems. CONVERTER DESIGN MHF+ Triple Series of DC/DC converters incorporate dual-phase, phase-shifted technology with a continuous flyback topology. This design eliminates a minimum load requirement on the main output and eliminates cross regulation effects between the main output voltage and the auxiliary output voltages. The phase-shifted design offers a further benefit in reduced input and output ripple. INHIBIT FUNCTION An open collector, TTL compatible, inhibit terminal (pin 1) provides shut-down and start-up control. Applying a logic level low (<0.8 V), referenced to input common, will disable the output of the converter. When inhibited input current is reduced to 5 mA or less and there is no generation of switching noise. The inhibit terminal typically sinks 3 mA when the converter is inhibited. Leaving the terminal open or pulling it high will enable the converter. Use an open collector interface for logic high voltages of up to 11 volts. (Refer to Figure 2 for a connection diagram.) An open collector interface is not required if the logic high is in excess of the open circuit voltage of the inhibit terminal, 11 volts, but less than 40 volts. SYNCHRONIZATION To synchronize the converter’s switching frequency to a system clock apply the clock signal to the sync terminal (pin 7). When multiple converters are powered from a single power source, asynchronous (free run) operation will result in lower peak noise for common spectral peaks, but synchronous operation will eliminate any possibility of interference frequencies in the low audio band. Source impedance of the signal should be less than 100 ohms and the transition time should be less than 100 nanoseconds. The capacitively coupled sync input will synchronize on a differential signal of as low as 4 volts to as high as 10 volts. If the sync function is not used, the terminal should be left open. SHORT CIRCUIT PROTECTION Internal current limiting circuitry protects all three outputs against short circuits. When output power exceeds approximately 130% of maximum output power, the output currents are limited. In addition, separate current limiting circuitry protects each output individually resulting in normal operation of either the main or the auxiliaries, whichever is not in a shorted condition. PACKAGING MHF+ Triple converters are packaged in hermetically sealed metal cases. MHF+ Triple converters can be purchased in a flanged or non-flanged case. The flanged option provides increased heat dissipation and also provides greater stability when mechanically secured. SOFT START FEATURE The soft-start feature provides a controlled 20 milliseconds turn-on to minimize inrush current and reduce overshoot at initial start-up or when inhibit is released. 1 MHF+ SERIES TRIPLE 15 WATT DC/DC CONVERTERS ABSOLUTE MAXIMUM RATINGS Input Voltage • 16 to 48 VDC Power Dissipation (Pd) • 12 watts Output Power • 15 watts Lead Soldering Temperature (10 sec per pin) • 300°C Storage Temperature Range (Case) • –65°C to +150°C RECOMMENDED OPERATING CONDITIONS Input Voltage Range • 16 to 48 VDC continuous • 80 V for up to 120 msec Case Operating Temperature (Tc) • –55°C to +125°C full power • –55°C to +135°C absolute Derating Output Power/Current • Linearly from 100% at 125°C to 0% at 135°C SYNC AND INHIBIT Sync 400 to 600 kHz • Duty cycle 40% to 60% • Logic low 0.8 V max • Logic high 4.5 V min, 10.0 V max • If not used, leave unconnected • Referenced to input common Inhibit: TTL Open Collector • Logic low (output disabled) Logic low voltage ≤0.8 V max Inhibit pin current 3.0 typ, 5.0 max • Referenced to input common Logic high (output enabled) Open collector Unconnected or 11 to 40 V 0° POSITIVE INPUT TYPICAL CHARACTERISTICS Output Voltage Temperature Coefficient • 150 ppm/°C typical Current Limit • 130% typical Isolation • 100 megohm minimum at 500 V Conversion Frequency • Free run 375 minimum, 500 kHz maximum • External sync range 400 to 600 kHz Inhibit Pin Voltage (unit enabled) • 10 V typical +5 OUTPUT FEEDBACK ISOLATOR PWM CM CONTROLLER OUTPUT COMMON INPUT COMMON FEEDBACK ISOLATOR + AUX. OUTPUT SYNC PWM CM CONTROLLER 180° –AUX. OUTPUT FIGURE 1: BLOCK DIAGRAM 2 DC/DC CONVERTERS MHF+ SERIES TRIPLE 15 WATT Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified. MHF+28512T PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT1 OUTPUT POWER2 MHF+28515T CONDITION MIN TYP MAX MIN TYP MAX MAIN 4.95 5.0 5.05 4.925 5.0 5.05 + AUXILIARY 11.64 12.0 12.36 14.55 15.0 15.45 – AUXILIARY 11.64 12.0 12.36 14.55 15.0 15.45 MAIN 0 — 1.5 0 — 1.5 + AUXILIARY — — 0.416 — — 0.333 – AUXILIARY — — 0.416 — — 0.333 TOTAL — — 2.125 — — 2.0 MAIN — — 7.5 — — 7.5 + AUXILIARY — — 5 — — 5 – AUXILIARY — — 5 — — 5 — — 15 — — 15 OUTPUT RIPPLE 10 kHz to 2 MHz TOTAL MAIN — 20 75 — 20 75 VOLTAGE 10 kHz to 2 MHz ± AUXILIARY — 30 90 — 30 112 LINE REGULATION3 MAIN — 25 75 — 25 75 VIN = MIN. TO MAX. ±AUXILIARY — 120 240 — 150 300 MAIN — 25 60 — 25 60 ± AUXILIARY — 120 240 — 150 300 LOAD REGULATION3, 4 CROSS REGULATION5 INPUT VOLTAGE INPUT CURRENT INPUT RIPPLE CURRENT STEP LOAD RESPONSE3, 7, 8 START-UP3, VDC A W mV p-p mV mV – AUXILIARY — — 1200 — — 1500 mV CONTINUOUS 16 28 48 16 28 48 VDC TRANSIENT 120 ms — — 80 — — 80 V NO LOAD3 — 20 35 — 20 35 FULL LOAD — 705 724 — 705 724 INHIBITED3 — 3 5 — 3 5 — 20 50 — 20 50 mA p-p 74 76 — 74 76 — % 10 kHz to 10 MHz EFFICIENCY LOAD FAULT6 UNITS mA POWER DISSIPATION MAIN3 — — 12 — — 12 ±AUXILIARY TRANSIENT MAIN ± AUXILIARY RECOVERY MAIN RECOVERY ±AUX. DELAY EACH OUTPUT — — 12 — — 12 — — — — — — — 5 2 10 850 750 8 3 25 — — — — — — — 5 2 10 850 750 8 3 25 Notes 1. The sum of the 12 volt auxiliary output currents may not exceed 625 mA. The sum of the 15 volt auxiliary output currents may not exceed 500 mA. 2. The sum of the auxiliary output power may not exceed 7.5 watts. 3. Case temperature –55°C to +125°C. 4. Load regulation for the +5 is specified at 0.0 to 1.5 A with the aux. both held at 3.76 W (313 mA for the ±12, 250 mA for the ±15). Load regulation for the aux. is specified as both aux. from 0.0 to 3.76 W (313 mA for ±12, 250 mA for ±15) at the same time with the +5 held at 1.5 A. W mV pk ms ms 5. Cross regulation only occurs between the two auxiliaries and is measured on –aux. +5 is held constant at 1.0 A. Cross regulation is specified for two conditions: Negative aux.= 3.76 W; positive aux.= 0.37 W to 3.76 W. Negative aux. = 0.37 W to 3.76 W; positive aux. = 3.76 W. 6. Load fault = <0.05 Ω. 7. Transition time is 2 – 10 µs. 8. Time to settle to within 1% of Vout final value. 3 MHF+ SERIES TRIPLE 15 WATT DC/DC CONVERTERS CONNECTION DIAGRAMS MHF+ Triple POSITIVE INPUT 9 10 k INHIBIT 1N4148 1 2N3501 200 pF 10 K 3.9 K 8 INPUT COMMON FIGURE 2: INHIBIT INTERFACE 9 0.01 28V F 7 +5 Output 2 Positive Input +5 Load + Aux. Output 4 Sync In + Aux. Load 5.1k Output Common 3 1 Inhibit 8 Input Common – Aux. Output 5 – Aux. Load If the sync terminal ([pin 7) is not used, it must be left floating. The ac coupling shown will prevent sync signal failure. FIGURE 3: AC COUPLING OF SYNC SIGNAL 1 Positive Input Positive Output 2 9 Positive Input FMH-461 EMI FILTER 28V 5 Input Common MHF+ TRIPLE Output Common 4 3 8 Input Common Case* 6 Chassis Ground *The case ground connection should be as low an impedance as possible to minimize EMI. Direct contact of baseplate to chassis ground provides the lowest impedance. FIGURE 4: EMI FILTER CONNECTION 4 DC/DC CONVERTERS MHF+ SERIES TRIPLE 15 WATT PIN OUT Pin 1 2 3 4 5 6 7 8 9 Description Inhibit Main (+5 V) Output Output Common Positive Auxiliary Output Negative Auxiliary Output Case Ground Sync In Input Common Positive Input If Sync is not used, leave it unconnected. Squared corner and dot on top of package indicate pin one. 1 2 3 4 5 BOTTOM VIEW MHF+ Triple 9 8 7 6 Dotted line outlines flanged package option. Refer to Figures 13 - 16 for dimensions. FIGURE 5: PIN OUT BOTTOM VIEW MODEL NUMBERING KEY MHF+ 28 512 T Base Model Input Voltage F / ES SMD NUMBERS STANDARD MICROCIRCUIT DRAWING (SMD) 5962-9560101HXC 5962-9560201HXC MHF+ SIMILAR PART MHF+28512T/883 MHF+28515T/883 Output Voltage (Main and aux. Vout) Number of Outputs (T = triple) Case Option (Non-flanged case has no designator in this position) Flanged SMDs have the suffix HZC instead of HXC. For exact specifications for an SMD product, refer to the SMD drawing. SMDs can be downloaded from http://www.dscc.dla.mil/programs/smcr Screening (Standard screening has no designator in this position.) 5 DC/DC CONVERTERS MHF+ SERIES TRIPLE 15 WATT Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified. EFFICIENCY EFFICIENCY 75 28 V 70 48 V 65 60 55 16 V 200 mV / div. 80 16 V 28 V 70 48 V 65 60 2 4 6 10 8 12 14 55 16 2 4 6 5 VDC 500 mV / div. 80 75 8 10 12 14 OUTPUT POWER (W) OUTPUT POWER (W) MHF+28512T EFFICIENCY MHF+28515T EFFICIENCY 16 +15 VDC –15 VDC 5 ms / div. INPUT V: 16 TO 40 VDC, ±15 = 250 mA EACH, +5 = 1.5 A MHF+ 28515T STEP LINE RESPONSE MHF+28512T has a similar response VIN +5 VDC +5 GND 5 V / div. +12 VDC 2 V / div. 2 V / div. INPUT GND +5 VDC +5 GND –12 VDC 5 ms / div. 5 ms / div. 5 ms / div. MHF+28512T TURN ON INTO FULL LOAD MAIN MHF+28512T TURN ON INTO FULL LOAD MAIN MHF+28512T TURN ON INTO FULL LOAD AUXILIARIES MHF+28515T has a similar response MHF+28515T has a similar response MHF+28515T has a similar response FIGURE 10 FIGURE 9 11.5 11 INPUT VOLTAGE VIN 10 V / div. VIN INPUT GND MHF+28515T 10.5 10 MHF+28512T 9.5 9 8.5 2 4 6 8 10 12 14 MAXIMUM OUTPUT POWER (W) LOW LINE DROPOUT FIGURE 12 6 FIGURE 8 FIGURE 7 10 V / div. 10 V / div. FIGURE 6 16 FIGURE 11 DC/DC CONVERTERS MHF+ SERIES TRIPLE 15 WATT Squared corner and dot on top of case indicate pin one. CASE E BOTTOM VIEW See Figure 14 for pin configurations. 1.130 max (28.70) 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 1.460 max (37.08) 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 13: CASE E MAXIMUM DIMENSIONS BOTTOM VIEW CASE E2 MHF+ Series Triple: Screening – Standard, ES, or 883 Projection Weld Seam Seal Squared corner and dot on top of case indicate pin one. 0.960 (24.38) 1 2 3 4 5 8 7 6 0.000 0.25 (6.35) 0.000 0.330 max (8.38) 0.25 (6.35) 0.000 0.330 max (8.38) 0.205 (5.21) 9 0.160 (4.06) 0.000 0.505 (12.83) 0.705 (17.91) 0.905 (22.99) 1.105 (28.07) 0.030 dia. (0.76) FIGURE 14: CASE E2 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. 7 MHF+ SERIES TRIPLE 15 WATT DC/DC CONVERTERS Squared corner and dot on top of case indicate pin one. CASE G BOTTOM VIEW Flanged package See Figure 16 for pin configuration Materials Header Cold Rolled Steel/Nickel/Gold Cover MHF+ Series and FMH Filter Kovar/Nickel Pins #52 alloy (all cases) compression glass seal 1.130 max (28.70) 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 2.005 max (50.93) 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: 0.047 (1.19) FIGURE 15: CASE G MAXIMUM DIMENSIONS BOTTOM VIEW CASE G2 Flanged case: Designator (F) required in Case Option position of model number. MHF+ Series Triple: Screening – Standard, ES, or 883 Projection Weld Squared corner and dot on top of case indicate pin one. 0.960 (24.38) 1 4 5 0.128 dia (3.25) 6 1.105 (28.07) 1.590 (40.39) 7 0.905 (22.99) 0.000 8 0.705 (17.91) 9 0.140 (3.56) 0.25 (6.35) 0.000 0.330 max. (8.38) 0.25 (6.35) 0.000 3 0.560 (14.22) 0.160 (4.06) 0.000 0.330 max. (8.38) 2 0.505 (12.83) 0.030 dia. (0.76) 0.205 (5.21) Seam Seal FIGURE 17: CASE G2 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. 8 MHF+ SERIES TRIPLE 15 WATT DC/DC CONVERTERS TABLE 1: ENVIRONMENTAL SCREENING TEST STANDARD /ES /883 (Class H)* yes yes yes PRE-CAP INSPECTION Method 2017, 2032 TEMPERATURE CYCLE (10 times) Method 1010, Cond. C, -65°C to 150°C no no yes Method 1010, Cond. B, -55°C to 125°C no yes no CONSTANT ACCELERATION Method 2001, 3000 g no no yes Method 2001, 500 g no yes no BURN-IN Method 1015, 160 hours at 125°C no no yes 96 hours at 125°C case (typical) no yes no FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 through 6: -55°C, +25°C, +125°C no no yes Subgroups 1 and 4: +25°C case yes yes no HERMETICITY TESTING Fine Leak, Method 1014, Cond. A no yes yes Gross Leak, Method 1014, Cond. C no yes yes Gross Leak, Dip (1 x 10-3) yes no no yes yes yes FINAL VISUAL INSPECTION Method 2009 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 –55°C to +125°C. Contact Information: www.interpoint.com Interpoint Headquarters USA Phone: 1-800-822-8782 +425-882-3100 Email: [email protected] Interpoint UK Phone: +44-1252-815511 Email: [email protected] 9 21623-002-DTS Rev B This revision supercedes all previous releases. 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 © 1995 - 1999 Interpoint. All rights reserved. Interpoint France Phone: +33-134285455 Email: [email protected]