MTO1212T INTERPOINT | Alldatasheet

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Technical content

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 TRIPLE +5 & ±12 +5 & ±15

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). C ONVERTER D ESIGN 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 uncon- nected or connecting it to Vin will enable the converter. The inhibit pin has an open circuit voltage of approximately 10 volts. 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. 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. DC/DC C ONVERTERS 12 & 28 VOLT INPUT MTO SERIES

15 W ATT

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.

TYPICAL CHARACTERISTICSINHIBIT RECOMMENDED OPERATING CONDITIONS ABSOLUTE MAXIMUM RATINGS 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 B4-24 MTO SERIES

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 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 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. MTO1212T MTO1215T MTO2812T MTO2815T PARAMETER CONDITION MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS OUTPUT CURRENT MAIN 1 100 — 2000 100 — 2000 100 — 2000 100 — 2000 mA OUTPUT POWER + AUXILIARY — — 2.5 — — 2.5 — — 2.5 — — 2.5 W OUTPUT RIPPLE MAIN — — 80 — — 80 — — 80 — — 80 VOLTAGE, BW = 1 MHZ ± AUXILIARY — — 30 — — 30 — — 30 — — 30 mV p-p LINE REGULATION MAIN — 5 10 — 5 10 — 5 10 — 5 10 mV Vin= MIN. TO MAX. ±AUXILIARY — 30 48 — 30 60 — 30 48 — 30 60 LOAD REGULATION MAIN — 10 20 — 10 20 — 10 20 — 10 20 mV NO LOAD TO FULL ± AUXILIARY — 30 48 — 30 60 — 30 48 — 30 60 INPUT VOLTAGE CONTINUOUS 9 12 16 9 12 16 16 28 36 16 28 36 VDC TRANSIENT 50 ms — — 25 — — 25 — — 50 — — 50 V INPUT CURRENT FULL LOAD — — 1670 — — 1670 — — 700 — — 700 mA INHIBITED — 8 10 — 8 10 — 8 10 — 8 10 INPUT RIPPLE CURRENT — 50 100 — 50 100 — 20 50 — 20 50 mA p-p EFFICIENCY 76 79 — 76 79 — 76 79 — 76 79 — % Electrical Characteristics: 25°C Tc, 28 VDC Vin (12 VDC for 12V models), 100% load, unless otherwise specified.

3.9K 2N3904 Optional Pullup (1) (2) (10) 13V BIAS Input Common Inhibit Short Circuit Amp Linear Regulator Linear Regulator Pass Transistor Pass Transistor Pulse Width Modulator Pre- Regulator Case Ground Error Amp 8Inhibit 1Positive Input 10Input Common +5 Vout Output Common Positive Auxiliary Output Negative Auxiliary Output FIGURE 2: INHIBIT INTERFACE EXAMPLE B4-25 MTO SERIES FIGURE 1: SIMPLIFIED SCHEMATIC

Representative of all models EFFICIENCY (%) 61 0 1 2 24 8 1 4 1 6

18 VIN 28 VIN

36 VIN

Output Power (Watts) Typical Performance Curve: 25°C Tc PIN OUT Pin Designation

1 Positive Input

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

top of cover indicate pin one. Dotted line outlines flanged package option. See Section B8, Cases F4 and J5, for dimensions FIGURE 3: PIN O UT MTO 12 12 T F / ES Base Model Input Voltage Output Voltage Number of Outputs (T = triple) (Aux. Vout) Screening Case Option (Non-flanged case has no designator in this position) (Standard screening has no designator in this position.) MODEL NUMBERING KEY 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.

0.000 0.170 (4.32) 1.170 (29.72) 0.000 0.170 (4.32) 0.570 (14.48) 0.970 (24.64) 1.370 (34.80) 1.770 (44.96) 0.040 dia. (1.02) 0.000 MTO and MHL Series: Screening – Standard or ES HR153 Series: no screening options BOTTOM VIEW CASE F4 0.250/0.300 (6.35/7.62) Solder Seal 0.505 max (12.83) Solder Tip-off 1 0 9876 12345 Squared corner and dot on top of case indicate pin one. FIGURE 23: CASE F4

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 CASE J BOTTOM VIEW See Figures 36 - 40 for pin configuration 1.350 max (34.29) 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: Cases J1 and J5 0.060 (1.52) Case J2 0.073 (1.85) max 2.720 max (69.09) Dot on top of case indicates pin one FIGURE 35: CASE J MAXIMUM D IMENSIONS 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.

85°C PRODUCTS TEST (85°C Products excluding HR products) STANDARD /ES PRE-CAP INSPECTION Method 2017 yes yes TEMPERATURE CYCLE (10 times) Method 1010, Cond. B, -55°C to 125°C no yes CONSTANT ACCELERATION Method 2001, 500 g no yes BURN-IN 96 hours at 70°C ambient (typical) no yes FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 and 4: +25°C case yes yes HERMETICITY TESTING 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 FINAL VISUAL INSPECTION Method 2009 yes yes Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534. 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 85°C PRODUCTS Applies to the following products: