DC/DC Converters 28 Volt Input MHE Series 20 Watt NOT RECOMMENDED FOR NEW DESIGNS Features models VDC Output • –55°C to +85°C operation • 17 to 40 VDC input typical Single 5 12 15 • 50 V for 50 ms transient protection in 28 Vin models • Fully isolated • Fixed frequency switching • Output trim on single output models • Inhibit function • Indefinite short circuit protection • Up to 83% efficiency Size (max.): Weight: Screening: Dual ±12 ±15 Non-flanged 2.110 x 1.120 x 0.495 inches MHE (case H6) (53.59 x 28.45 x 12.57) mm Flanged 2.910 x 1.115 x 0.495 inches MHE (case K7) (73.91 x 28.45 x 12.57) mm See cases H6 and K7 for dimensions. 50 grams typical Standard or ES. See screening table for more information. description The Interpoint® 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 to “ES” standards. 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 11 to 13 VDC. 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. 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. 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. 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. Crane Aerospace & Electronics Power Solutions – Interpoint Products 10301 Willows Road NE, Redmond, WA 98052 +1 425-882-3100 • [email protected] www.craneae.com/interpoint Automatic current limiting circuitry protects the MHE Series converters against short circuits. 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 flange-mount option be used. This option provides improved thermal transfer capabilities as well as a mechanically secure mounting configuration. Page 1 of 7 MHE Rev AA - 2015.06.12 DC/DC Converters absolute maximum ratings 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 Transient •50 V for 50 msec 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 •Derate by 33% at 16 Vin www.craneae.com/interpoint typical characteristics Output Voltage Temperature Coefficient •150 ppm/°C, typical Input to Output Capacitance •60 pF, typical Isolation •100 megohm minimum at 500 V Conversion Frequency •125 kHz, typical Inhibit Pin Voltage (unit enabled) •11 to 13 V MHE28XXX inhibit Inhibit TTL Open Collector •Logic low (output disabled) Logic low voltage ≤0.8 V •Referenced to input common •Logic high (output enabled) Open collector Page 2 of 7 MHE Rev AA - 2015.06.12 MHE Series 20 Watt DC/DC Converters MHE Series 20 Watt Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. single output models PARAMETER mhe2805s CONDITIONS output voltage output current 1 output power 1 tc = -55°C to +85°C mhe2812s MIN TYP MAX MIN 4.95 5.00 5.05 11.88 — — 3.0 — mhe2815s TYP MAX 12.00 12.12 — 1.67 UNITS MIN TYP MAX 14.85 15.00 15.15 VDC — — 1.33 A tc = -55°C to +85°C — — 15 — — 20 — — 20 W 0 to 1 MHz — 35 60 — 60 80 — 30 60 mV p-p line regulation vin min to max — 2 — 3 10 — 3 10 mV load regulation no load to full — 10 20 — 5 15 — 5 15 mV VDC output ripple continuous 17 28 40 17 28 40 17 28 40 transient 50 ms — — 50 — — 50 — — 50 V no load — — 18 — — 30 — — 30 mA 10 kHz to 2 MHz — 20 50 — 25 50 — 25 50 mA p-p 78 81 — 79 82 — 80 83 — % input voltage input current input ripple 5 efficiency dual output models PARAMETER mhe2812d CONDITIONS output power 1 TYP MAX MIN TYP MAX ±11.88 ±12.00 ±12.12 ±14.85 ±15.00 ±15.15 tc = -55°C to +85°C — ±0.63 — tc = -55°C to +85°C — — 15 — — 50 — output voltage output current 1 MIN mhe2815D — — UNITS VDC ±0.5 A 15 W 30 50 mV p-p 3 15 mV 0 to 1 MHz — 30 line regulation vin min to max — 3 10 — load regulation no load to full — 5 15 — 5 15 mV continuous 17 28 40 17 28 40 VDC transient 50 ms — — 50 — — 50 V no load — — 35 — — 35 mA 10 kHz to 2 MHz — 25 50 — 25 50 mA p-p 76 79 — 76 79 — % output ripple input voltage input current input ripple efficiency Note 1.On dual output models at least 25% of the load should be on the positive output. www.craneae.com/interpoint Page 3 of 7 MHE Rev AA - 2015.06.12 DC/DC Converters MHE Series 20 Watt pin out PinSingle OutputDual Output 1 Positive Input Positive Input 2 Inhibit Inhibit 3Output Adjust Positive Output 4Output CommonOutput Common 5 Positive Output Negative Output 6 No connection No connection 7 No connection No connection 8 Case Ground Case Ground 9 No connection No connection 10 Input Common Input Common Squared corner and dot on top of cover indicate pin one. 1 10 4 5 9 8 7 6 Dotted line outlines flanged package option. See cases H6 and K7 for dimensions. Figure 1: Pin Out model numbering key Base Model Input Voltage MHE 28 12 S F / ES 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 all single output models: The output can be adjusted upward by using the output adjust (pin 3) 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. www.craneae.com/interpoint 3 BOTTOM VIEW MHE OUTPUT ADJUSTMENT RESISTOR VALUES for Mhe2805s ResistanceOutput Voltage Pin 3 to 4Increase (%) ∞ 0 390K +1% 145K +2% 63K +3% 22K +4% 0 +5% 2 Page 4 of 7 MHE Rev AA - 2015.06.12 DC/DC Converters MHE Series 20 Watt BOTTOM VIEW CASE H6 Solder Seal Dot on top of case indicates pin one 1.120 (28.45) 2 3 4 5 10 9 8 7 6 1.055 (26.80) 1.455 (36.96) 1.855 (47.12) Solder Tip-off 1 0.655 (16.64) 0.040 dia (1.02) 0.255 (6.48) 0.960 (24.38) 0.160 (4.06) 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 300°C for 10 seconds per pin. Materials Header Cold Rolled Steel/Nickel/Tin Cover Cold Rolled Steel/Nickel/Tin Pins #52 alloy, compression glass seal or ceramic seal Case H6, Rev D, 20100211 Please refer to the numerical dimensions for accuracy. All 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. Copyright © 1999-2010 Interpoint Corp. All rights reserved. Figure 4: Case H6 – MHE non-Flanged www.craneae.com/interpoint Page 5 of 7 MHE Rev AA - 2015.06.12 2.110 (53.59) 0.000 0.25 +0.05/-0.00 (6.4 +1.3/-0.0) 0.000 0.495 max (12.57) 0.000 DC/DC Converters MHE Series 20 Watt BOTTOM VIEW CASE K7 *Flanged case: Designator ("F") required in Case Option position of model number. Solder Seal Squared corner and dot on top of case indicate pin one. 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) 2 x Dia 0.162 ±0.002 (4.11 ±0.05) 2 x R 0.170 (4.32) 0.555 (14.1) Solder Tip-off 0.155 (3.94) (2.910 max (73.91)) Flange Thickness: 0.067 +0.005/-0.007 (1.70 +0.13/-0.8) 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 300°C for 10 seconds per pin. Case K7, Rev F, 20100419 Please refer to the numerical dimensions for accuracy. All 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. Copyright © 1999-2010 Interpoint Corp. All rights reserved. Figure 6: Case K7 – MHE Flanged www.craneae.com/interpoint Page 6 of 7 MHE Rev AA - 2015.06.12 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 DC/DC Converters MHE Series 20 Watt Table is for reference only. See individual Series' datasheets for specific screening. DC-DC CONVERTERS AND EMI FILTERS STANDARD AND /ES (NON-QML) ENVIRONMENTAL SCREENING 1 NON-QML TEST PERFORMED pre-cap inspection Method 2017, 2032 STANDARD /ES n n temperature cycle (10 times) Method 1010, Cond. B, -55°C to +125°C, ambient n constant acceleration Method 2001, 500 g n Burn-in Method 1015 2 96 hours n Final electrical test MiL-prF-38534, Group a Subgroups 1 and 4: +25°C case n n Hermeticity test Fine leak, Method 1014, Cond. A n gross leak, Method 1014, Cond. C n gross leak, Dip n Final visual inspection Method 2009 n n Test methods are referenced to MIl-STD-883 as determined by MIl-PRF-38534. Notes Notes: 1. Standard and /ES, non-QMl products, may not meet all of the requirements of MIl-PRF-38534. 1. Referstemperature to products that do not offer QML screening. 2. Burn-in designed to bring the case temperature to the maximum case temperature of the product. Refer to the specific information fornon-QML the maximum case temperature. Burn-in a powered test. 2. product Standard and /ES, products, do not meet all ofisthe requirements of MIL-PRF-38534. 3. Burn-in designed to bring the case temperature to the maximum case temperature of 85°C. TABLE 8: ENVIRONMENTAL SCREENING–HIGH RELIABILITY STANDARD AND /ES, NON-QML MHE Single and Dual - MHE Rev AA - 2015.06.12. This revision supersedes all previous releases. All information is believed to be accurate, but no responsibility is assumed for errors or omissions. Crane Electronics, Inc. reserves the right to make changes in products or specifications without notice. Interpoint is a registered trademark of Crane Co. MHE Series is a trademark of Crane Electronics, Inc. Copyright © 1999 - 2015 Crane Electronics, Inc. All rights reserved. http://www.craneae.com/interpoint Page 7 of 7