DC/DC Converters 28 Volt Input mto Series 15 Watt NOT RECOMMENDED FOR NEW DESIGNS Features • –55°C to +85° C operation models VDC Output • 16 to 36 VDC input • 50 V for 50 ms transient protection triple +5 & ±12 +5 & ±15 • Fully isolated • Fixed frequency switching • Inhibit function • Indefinite short circuit protection Size (max.): Non-flanged, case F4, 1.950 x 1.350 x 0.505 inches (49.53 x 34.29 x 12.83 mm) Flanged, case J5, 2.720 x 1.350 x 0.505 inches (69.09 x 34.29 x 12.83 mm) See cases F4 and J5 for dimensions. Weight: 53 grams typical Screening: Standard or ES. See screening table for more information. • Up to 79% efficiency Description Features Interpoint’s MTO Series™ of DC/DC converters delivers 15 watts of output power with three output voltages and a choice of two input voltage ranges. The MTO Series converters are packaged in hermetically sealed metal cases and operate at full load over a case temperature range of -55°C to +85°C (measured at the base plate of the converter). An inhibit terminal, pin 8, provides shut-down and start-up control. Applying a logic low (<0.8 V) will disable the output of the converter reducing input current to 8 mA, typical. Leaving the terminal unconnected or connecting it to Vin will enable the converter. The inhibit pin has an open circuit voltage of approximately 10 volts. Converter Design Soft-start provides a controlled 20 milliseconds turn-on to minimize inrush current and reduce overshoot at initial start-up or when inhibit is released. The push-pull forward topology coupled with pulse-width modulation minimizes output noise and maintains good regulation. Nominal switching frequency is 250 kHz. Although an internal input filter reduces input ripple current, for applications requiring conformance to MIL-STD-461C, CE03, use the MTO in conjunction with Interpoint’s FM-461 EMI filter. Operating at maximum ratings may require removing self-generated heat. To increase heat dissipation, heat conducting material can be used in contact with the converter’s base plate. Interpoint’s Thermal Mounting Pad (TMP), model TMP-002, is designed for use with the MTO converter. Positive 1 Input PreRegulator Pulse Width Modulator Short Circuit Amp Input 10 Common 8 Inhibit Case Ground Internal current limiting circuitry protects all three outputs against short circuits. When output power exceeds approximately 125% of maximum output power, the output currents are limited. In addition, separate current limiting circuitry protects each output individually. Packaging MTO converters are packaged in hermetically sealed metal cases. The cases are constructed of coldrolled steel with a fused tin 2 finish. MTO converters can +5 Vout be purchased in a flanged or non-flanged case. The flanged option provides Error Amp increased heat dissipation 3 Output and also provides greater Common stability when mechanically secured. Pass Transistor 5 Positive Auxiliary Output 4 Negative Auxiliary Output Linear Regulator 7 Linear Regulator Pass Transistor Figure 1: Simplified Schematic Crane Aerospace & Electronics Electronics Group (Interpoint Brand) PO Box 97005 • Redmond WA 98073-9705 425.882.3100 • [email protected] www.interpoint.com Page 1 of 6 MTO Rev C 20100212 DC/DC Converters absolute maximum ratings mto series 15 Watt recommended operating conditions Output Power •15 watts Lead Soldering Temperature (10 sec per lead) •300°C Storage Temperature Range (Case) •–65°C to +125°C Input Voltage Range •16 to 36 VDC continuous • 50 V for 50 msec transient Case Operating Temperature (Tc) •–55°C to +85°C full power •–55°C to +115°C absolute Derating Output Power/Current •Linearly from 100% at 85°C to 0% at 115° C typical characteristics Output Voltage Temperature Coefficient •150 ppm/°C typical Input to Output Capacitance •80 pF typical Current Limit •125% of full load typical Isolation •100 megohm minimum at 500 V Conversion Frequency •250 kHz typical Inhibit Pin Voltage (unit enabled) •10 V typical inhibit Inhibit TTL Open Collector •Logic low (output disabled) V = <0.8 V Inhibit pin current < 2.0 mA •Referenced to input common •Logic high (output enabled) Unconnected or connected to Vin Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified. triple output models PARAMETER output voltage output current output power output ripple bw = 1 MHz line regulation vin = min to max load regulation no load to full input voltage input current input ripple current mto2812t mto2815t CONDITIONS MIN TYP MAX MIN TYP MAX main 4.95 5.0 5.05 4.95 5.0 5.05 + auxiliary 11.88 12.0 12.12 14.85 15.0 15.15 - auxiliary 11.88 12.0 12.12 14.85 15.0 15.15 main1 100 — 2000 100 — 2000 auxiliary — — ±208 — — ±167 — 10.0 — — 10.0 UNITS VDC mA main — + auxiliary — — 2.5 — — 2.5 - auxiliary — — 2.5 — — 2.5 total — — 15 — — 15 main — — 80 — — 80 ± auxiliary — — 30 — — 30 main — 5 10 — 5 10 ± auxiliary — 30 48 — 30 60 main — 10 20 — 10 20 ± auxiliary — 30 48 — 30 60 continuous 16 28 36 16 28 36 VDC transient 50 ms — — 50 — — 50 V no load — — 30 — — 30 full load — — 700 — inhibited — 8 10 — 20 50 — 700 — 8 10 — 20 50 W mV p-p mV mV mA mA p-p efficiency 76 79 — 76 79 — % Notes 1. Minimum load required for full output capability on auxiliary outputs. Minimum current can be reduced when dual outputs are used at reduced loads. www.interpoint.com Page 2 of 6 MTO Rev C 20100212 DC/DC Converters mto series 15 Watt (1) Positive Input Optional Pullup BIAS 2N3904 Inhibit (2) 10K 3.9K 13V 3K Input Common (10) 9K Figure 2: Inhibit Interface Example PIN OUT PinDesignation 1 Positive Input 2 +5 VDC Output 3 Output Common 4 Negative Aux. Output 5 Positive Aux. Output 6 No Connection 7 Case Ground 8 Inhibit 9 No Connection 10 Input Common Squared corner and dot on top of cover indicate pin one. 1 2 3 4 5 7 6 BOTTOM VIEW MTO 10 9 8 Dotted line outlines flanged package option. See cases F4 and J5 for dimensions Figure 3: Pin Out Typical Performance Curve: 25°C Tc 82 model numbering key MTO 28 12 T F / ES 78 EFFICIENCY (%) Base Model Input Voltage Output Voltage (Aux. Vout) Number of Outputs (T = triple) 36 VIN 76 74 72 70 68 Case Option (Non-flanged case has no designator in this position) 66 2 4 6 8 10 12 14 16 Output Power (Watts) Representative of all models Screening (Standard screening has no designator in this position.) www.interpoint.com 28 VIN 18 VIN 80 MTO2815T Efficiency Figure 4 Page 3 of 6 MTO Rev C 20100212 DC/DC Converters mto series 15 Watt BOTTOM VIEW CASE F4 Solder Tip-off 0.173 (4.39) 1 2 3 4 5 10 9 8 7 6 1.770 (44.96) 0.040 dia. (1.02) 1.370 (34.80) 1.173 (29.79) 0.970 (24.64) 1.350 max (4.39) 0.570 (14.48) Squared corner and dot on top of case indicate pin one. 0.170 (4.32) Solder Seal Seal hole: 0.083 ±0.003 (2.11 ±0.08) 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 1.950 max (49.53) 0.000 0.250/0.300 (6.35/7.62) 0.000 0.505 max (12.83) 0.000 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 F4, Rev C, 20060802 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 © 1999-2006 Interpoint Corp. All rights reserved. Figure 5: Case F4 www.interpoint.com Page 4 of 6 MTO Rev C 20100212 DC/DC Converters mto series 15 Watt BOTTOM VIEW CASE J5 1 2 3 4 5 10 9 8 7 6 1.770 (44.96) 0.040 dia. (1.02) 1.370 (34.80) 1.173 (29.79 0.970 (24.64) 1.350 max. (34.29) 0.570 (14.48) Squared corner and dot on top of case indicate pin one. 0.170 (4.32) Solder Seal 0.162 dia. (4.11) 0.673 (17.09) Solder Tip-off 0.173 (4.39) 2.720 max (69.09) Flange thickness: 0.073 (1.85) max. 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 J5, Rev E, 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 6: Case j5 www.interpoint.com Page 5 of 6 MTO Rev C 20100212 2.150 (54.61) 0.000 0.210 (5.33) 0.25 (6.4) 0.000 0.505 max (12.83) 0.000 DC/DC Converters mto series 15 Watt STANDARD AND /ES (NON-QML) PRODUCTS ENVIRONMENTAL SCREENING 1 standard non-Qml2 /es non-Qml2 Pre-cap Inspection Method 2017, 2032 yes yes Temperature Cycle (10 times) Method 1010, Cond. B, -55°C to +125°C, ambient no yes Constant Acceleration Method 2001, 500 g no yes Burn-in Method 1015 3 96 hours no yes Final Electrical Test MIL-PRF-38534, Group A Subgroups 1 and 4: +25°C case yes yes Hermeticity Test Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) no no yes yes yes no Final visual inspection Method 2009 yes yes test perFormed Test methods are referenced to mIl-sTD-883 as determined by mIl-PRF-38534. Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. Notes: 1. refers to products that do not offer QML screening. Notes: standard and /es, non-Qml products, do not meet all of the requirements of mIl-PRF-38534. 1.2.Refers to products that do not offer QML screening. 3. Burn-in designed to bring the case temperature to the maximum case temperature of the product. Refer to the specific product information 2. Standard and /ES, products, do not meet all of the requirements of MIL-PRF-38534. for the maximum casenon-QML temperature. 3. Burn-in designed to bring the case temperature to the maximum case temperature of 85°C. MTO Series DC/DC Converters, MTO Rev C 20100212. This revision supersedes 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. MTO Series is a trademark of Interpoint. Copyright © 1999 - 2010 Interpoint Corporation. All rights reserved. www.interpoint.com Page 6 of 6