FEATURES • • • • • • • • • • –55°C to +85° C operation 9 to 16 or 16 to 36 VDC input Fully isolated Opto-coupler feedback Fixed frequency, 250 kHz typical Topology – Push-Pull Forward 50 V for 50 ms transient protection Inhibit function Indefinite short circuit protection Up to 79% efficiency DC/DC CONVERTERS 12 & 28 VOLT INPUT MTO SERIES 15 WATT MODELS VDC OUTPUT TRIPLE +5 & ±12 +5 & ±15 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 Section B8, cases F4 and J5, for dimensions. Weight: 53 grams typical Screening: Standard or ES. See Section C2 for screening options, see Section A5 for ordering information. DESCRIPTION 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). FEATURES 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. 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. 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 cold-rolled steel with a fused tin finish. MTO 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. B4-23 MTO SERIES 15 WATT DC/DC CONVERTERS INHIBIT ABSOLUTE MAXIMUM RATINGS TYPICAL CHARACTERISTICS 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 Output Power • 15 watts Lead Soldering Temperature (10 sec per lead) • 300°C Storage Temperature Range (Case) • –65°C to +125°C 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 RECOMMENDED OPERATING CONDITIONS Input Voltage Range • MTO12XXT 9 to 16 VDC continuous • MTO28XXT 16 to 36 VDC continuous • MTO12XXT 25 V for 50 msec transient • MTO28XXT 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 Electrical Characteristics: 25°C Tc, 28 VDC Vin (12 VDC for 12V models), 100% load, unless otherwise specified. MTO1212T PARAMETER OUTPUT VOLTAGE OUTPUT CURRENT MTO1215T MTO2812T MTO2815T CONDITION MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX MAIN 4.95 5.0 5.05 4.95 5.0 5.05 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 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 11.88 12.0 12.12 14.85 15.0 15.15 MAIN1 100 — 2000 100 — 2000 100 — 2000 100 — 2000 AUXILIARY — — ±208 — — ±167 — — ±208 — — ±167 MAIN — — 10.0 — — 10.0 — — 10.0 — — 10.0 + AUXILIARY — — 2.5 — — 2.5 — — 2.5 — — 2.5 – AUXILIARY — — 2.5 — — 2.5 — — 2.5 — — 2.5 TOTAL — — 15 — — 15 — — 15 — — 15 MAIN — — 80 — — 80 — — 80 — — 80 ± AUXILIARY — — 30 — — 30 — — 30 — — 30 LINE REGULATION MAIN — 5 10 — 5 10 — 5 10 — 5 10 Vin = MIN. TO MAX. ±AUXILIARY — 30 48 — 30 60 — 30 48 — 30 60 LOAD REGULATION MAIN — 10 20 — 10 20 — 10 20 — 10 20 NO LOAD TO FULL ± AUXILIARY — 30 48 — 30 60 — 30 48 — 30 60 OUTPUT POWER OUTPUT RIPPLE VOLTAGE, BW = 1 MHZ UNITS VDC mA W mV p-p mV mV CONTINUOUS 9 12 16 9 12 16 16 28 36 16 28 36 VDC TRANSIENT 50 ms — — 25 — — 25 — — 50 — — 50 V NO LOAD — — 60 — — 60 — — 30 — — 30 FULL LOAD — — 1670 — — 1670 — — 700 — — 700 INHIBITED — 8 10 — 8 10 — 8 10 — 8 10 CURRENT — 50 100 — 50 100 — 20 50 — 20 50 mA p-p EFFICIENCY 76 79 — 76 79 — 76 79 — 76 79 — % INPUT VOLTAGE INPUT CURRENT mA INPUT RIPPLE Note 1. Minimum load required for full output capability on auxiliary outputs. Minimum current can be reduced when dual outputs are used at reduced loads. B4-24 DC/DC CONVERTERS Positive 1 Input MTO SERIES 15 WATT 2 +5 Vout Error Amp 3 Output Common Pass Transistor 5 Positive Auxiliary Output 4 Negative Auxiliary Output PreRegulator Pulse Width Modulator Short Circuit Amp Input 10 Common 8 Inhibit Case Ground Linear Regulator 7 Linear Regulator Pass Transistor FIGURE 1: SIMPLIFIED SCHEMATIC (1) Positive Input Optional Pullup BIAS 2N3904 Inhibit (2) 10K 3.9K Input Common 13V 3K (10) 9K FIGURE 2: INHIBIT INTERFACE EXAMPLE B4-25 MTO SERIES 15 WATT DC/DC CONVERTERS PIN OUT Pin 1 2 3 4 5 6 7 8 9 10 Squared corner and dot on top of cover indicate pin one. Designation Positive Input +5 VDC Output Output Common Negative Aux. Output Positive Aux. Output No Connection Case Ground Inhibit No Connection Input Common 1 2 3 4 5 7 6 BOTTOM VIEW MTO 10 9 8 Dotted line outlines flanged package option. See Section B8, Cases F4 and J5, for dimensions FIGURE 3: PIN OUT Typical Performance Curve: 25°C Tc 82 MODEL NUMBERING KEY MTO 12 12 T 28 VIN 18 VIN 80 F / ES 78 Output Voltage (Aux. Vout) 76 Number of Outputs (T = triple) Case Option (Non-flanged case has no designator in this position) Screening (Standard screening has no designator in this position.) EFFICIENCY (%) Base Model Input Voltage 36 VIN 74 72 70 68 66 2 4 6 8 10 12 14 Output Power (Watts) Representative of all models MTO2815T Efficiency FIGURE 4 B4-26 24223-001-DTS Rev A DQ# 1021 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 © 1990 - 1999 Interpoint. All rights reserved. 16 CASES CASE F Dot on top of case indicates pin one CASE F BOTTOM VIEW See Figures 20 - 23 for pin configuration Materials Header Case F1 Cold Rolled Steel/Nickel/Gold Cases F2 - F4 Cold Rolled Steel/Nickel/Tin Cover Case F1 Kovar/Nickel Cases F2 - F4 Cold Rolled Steel/Nickel/Tin Pins #52 alloy (all cases) MHV Series Triple – compression glass seal MTR Series Triple, case F1 – ceramic seal MTR Series Triple, case F2 – compression glass seal HUM40 – compression glass seal or ceramic seal Case F3 – compression glass seal Case F4 – compression glass seal or ceramic seal 1.350 max (34.29) 1.950 max (49.53) 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 dimensions in inches (mm) Tolerance ±0.005 (0.13) for three decimal places ±0.01 (0.2) for two decimal places unless otherwise specified FIGURE 19: CASE F MAXIMUM DIMENSIONS BOTTOM VIEW CASE F1 MTR Series Triple and MHV Series Triple: Screening – Standard, ES, or 883 Platform Bathtub Dot on top of case indicates pin one Seam Seal 1.170 (29.72) 0.040 dia. (1.02) 1 2 3 4 5 10 9 8 7 6 MTR Series MHV Series 0.170 (4.32) 1.770 (44.96) 1.370 (34.80) 0.970 (24.64) 0.570 (14.48) 0.170 (4.32) 0.000 0.25 (6.4) 0.000 0.25 (6.4) 0.405 max (10.29) 0.000 0.405 max (10.29) 0.000 FIGURE 20: CASE F1 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. B8-12 CASES CASE F BOTTOM VIEW CASE F4 MTO and MHL Series: Screening – Standard or ES HR153 Series: no screening options Squared corner and dot on top of case indicate pin one. Solder Seal 1.170 (29.72) 1 2 3 4 5 10 9 8 7 6 0.040 dia. (1.02) Solder Tip-off 0.170 (4.32) FIGURE 23: CASE F4 B8-14 1.770 (44.96) 1.370 (34.80) 0.970 (24.64) 0.570 (14.48) 0.170 (4.32) 0.000 0.250/0.300 (6.35/7.62) 0.000 0.505 max (12.83) 0.000 CASES CASE J Dot on top of case indicates pin one CASE J BOTTOM VIEW See Figures 36 - 40 for pin configuration 1.350 max (34.29) 2.720 max (69.09) Flange Thickness: Cases J1 and J5 Case J2 Cases J3 and J4 0.060 (1.52) 0.073 (1.85) max 0.067 +0.005/-0.007 (1.70 +0.13/-0.8) Materials Header Case J1 Cold Rolled Steel/Nickel/Gold Cases J2 - J5 Cold Rolled Steel/Nickel/Tin Cover Case J1 Kovar/Nickel Case J2 - J5 Cold Rolled Steel/Nickel/Tin Pins #52 alloy (all cases) Case J1 MHV Series Triple – compression glass seal MTR Series Triple – ceramic seal Cases J2 - J5 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 35: CASE J MAXIMUM DIMENSIONS 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. B8-22 CASES CASE J BOTTOM VIEW CASE J4 Flanged cases: Designator required in Case Option position of model number. FMD28-461 EMI Filter (down-leaded): Screening – Standard or ES Squared corner and dot on top of case indicate pin one. Solder Seal 1.173 (29.79 1 0.040 dia. (1.02) 2 0.162 dia (4.11) 0.673 (17.09) 4 3 1.770 (44.96) 5 0.173 (4.39) 1.370 (34.80) Solder Tip-off 1.980 (50.29) 0.170 (4.32) 0.000 0.210 (5.33) 0.25 (6.4) 0.000 0.505 max (12.83) 0.000 FIGURE 39: CASE J4 BOTTOM VIEW CASE J5 Flanged cases: Designator required in Case Option position of model number for MHL Series and MTO Series only. MHL Series, MTO Series, MTW Series: Screening – Standard or ES HR300 Series: no screening options Squared corner and dot on top of case indicate pin one. Solder Seal 1.173 (29.79 1 0.040 dia. (1.02) 2 3 4 5 0.162 dia (4.11) 0.673 (17.09) 9 8 7 6 1.770 (44.96) 10 0.173 (4.39) 1.370 (34.80) Solder Tip-off 1.980 (50.29) 0.970 (24.64) 0.570 (14.48) 0.170 (4.32) 0.000 0.210 (5.33) 0.25 (6.4) 0.000 0.505 max (12.83) 0.000 FIGURE 40: CASE J5 B8-25 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/MLP Series MHL Series MRH Series MTO Series MSR Series DCH Series FM/FMA/FMB EMI Filters MSF EMI Filter C2-12