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FEATURES
* * * * * * * * * * -55C 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 SeriesTM 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 -55C to +85C (measured at the base plate of the converter).
FEATURES
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. 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.
CONVERTER DESIGN
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.
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
ABSOLUTE MAXIMUM RATINGS
Output Power * 15 watts Lead Soldering Temperature (10 sec per lead) * 300C Storage Temperature Range (Case) * -65C to +125C
DC/DC CONVERTERS
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
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
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) * -55C to +85C full power * -55C to +115C absolute Derating Output Power/Current * Linearly from 100% at 85C to 0% at 115 C
Electrical Characteristics: 25C Tc, 28 VDC Vin (12 VDC for 12V models), 100% load, unless otherwise specified.
MTO1212T PARAMETER OUTPUT VOLTAGE CONDITION MAIN + AUXILIARY - AUXILIARY OUTPUT CURRENT MAIN1 AUXILIARY MAIN OUTPUT POWER + AUXILIARY - AUXILIARY TOTAL OUTPUT RIPPLE VOLTAGE, BW = 1 MHZ LINE REGULATION Vin = MIN. TO MAX. LOAD REGULATION NO LOAD TO FULL INPUT VOLTAGE MAIN AUXILIARY MAIN AUXILIARY MAIN AUXILIARY CONTINUOUS TRANSIENT 50 ms NO LOAD INPUT CURRENT INPUT RIPPLE CURRENT EFFICIENCY -- 76 50 79 100 -- -- 76 50 79 100 -- -- 76 20 79 50 -- -- 76 20 79 50 -- mA p-p % FULL LOAD INHIBITED MIN 4.95 11.88 11.88 100 -- -- -- -- -- -- -- -- -- -- -- 9 -- -- -- -- TYP 5.0 12.0 12.0 -- -- -- -- -- -- -- -- 5 30 10 30 12 -- -- -- 8 MAX 5.05 MTO1215T MIN 4.95 TYP 5.0 15.0 15.0 -- -- -- -- -- -- -- -- 5 30 10 30 12 -- -- -- 8 MAX 5.05 15.15 15.15 2000 167 10.0 2.5 2.5 15 80 30 10 60 20 60 16 25 60 1670 10 MTO2812T MIN 4.95 11.88 11.88 100 -- -- -- -- -- -- -- -- -- -- -- 16 -- -- -- -- TYP 5.0 12.0 12.0 -- -- -- -- -- -- -- -- 5 30 10 30 28 -- -- -- 8 MAX 5.05 12.12 12.12 2000 208 10.0 2.5 2.5 15 80 30 10 48 20 48 36 50 30 700 10 MTO2815T MIN 4.95 14.85 14.85 100 -- -- -- -- -- -- -- -- -- -- -- 16 -- -- -- -- TYP 5.0 15.0 15.0 -- -- -- -- -- -- -- -- 5 30 10 30 28 -- -- -- 8 MAX 5.05 15.15 15.15 2000 167 10.0 2.5 2.5 15 80 30 10 60 20 60 36 50 30 700 10 mA VDC V mV mV p-p mV W mA VDC UNITS
12.12 14.85 12.12 14.85 2000 208 10.0 2.5 2.5 15 80 30 10 48 20 48 16 25 60 1670 10 100 -- -- -- -- -- -- -- -- -- -- -- 9 -- -- -- --
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 PreRegulator
MTO SERIES 15 WATT
2 +5 Vout
Pulse Width Modulator
Error Amp
3
Output Common
Short Circuit Amp Input 10 Common 8 Inhibit Case Ground 7
Pass Transistor
5
Positive Auxiliary Output
Linear Regulator Linear Regulator
4 Pass Transistor
Negative Auxiliary Output
FIGURE 1: SIMPLIFIED SCHEMATIC
Positive Input Optional Pullup 2N3904 Inhibit 10K 3.9K Input Common
(1)
BIAS (2) 13V 3K
(10) 9K
FIGURE 2: INHIBIT INTERFACE EXAMPLE
B4-25
MTO SERIES 15 WATT
Pin 1 2 3 4 5 6 7 8 9 10
DC/DC CONVERTERS
PIN OUT
Designation Positive Input +5 VDC Output Output Common Negative Aux. Output Positive Aux. Output No Connection Case Ground Inhibit No Connection Input Common Squared corner and dot on top of cover indicate pin one.
1
2
3
4
5
BOTTOM VIEW MTO
10 9 8 7 6
Dotted line outlines flanged package option.
See Section B8, Cases F4 and J5, for dimensions
FIGURE 3: PIN OUT
Typical Performance Curve: 25C Tc
MODEL NUMBERING KEY
MTO Base Model Input Voltage 12 12 T F / ES
82 18 VIN 80 78 EFFICIENCY (%) 76 74 72 70 68 66 2 4 6 8 10 12 14 16 36 VIN 28 VIN
Output Voltage (Aux. Vout) 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.)
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 (c) 1990 - 1999 Interpoint. All rights reserved.
CASE F
CASES
Dot on top of case indicates pin one 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 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 F BOTTOM VIEW See Figures 20 - 23 for pin configuration
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 300C for 10 seconds per pin.
FIGURE 19: CASE F MAXIMUM DIMENSIONS
BOTTOM VIEW CASE F1 MTR Series Triple and MHV Series Triple: Screening - Standard, ES, or 883
Bathtub Platform Dot on top of case indicates pin one
1.170 (29.72) 0.040 dia. (1.02) MHV Series MTR Series
Seam Seal
1
2
3
4
5
10 0.170 (4.32) 0.000 0.25 (6.4) 0.405 max (10.29) 0.000 0.000 0.170 (4.32)
9
8
7
6
0.570 (14.48)
0.970 (24.64)
1.370 (34.80)
0.405 max (10.29)
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
0.25 (6.4)
FIGURE 20: CASE F1
1.770 (44.96)
0.000
CASE F
CASES
BOTTOM VIEW CASE F4 MTO and MHL Series: Screening - Standard or ES HR153 Series: no screening options
Solder Seal
1.170 (29.72) 0.040 dia. (1.02)
Squared corner and dot on top of case indicate pin one.
1
2
3
4
5
Solder Tip-off
0.170 (4.32) 0.000 0.505 max (12.83) 0.250/0.300 (6.35/7.62) 0.000 0.000
10
9
8
7
6
0.170 (4.32)
0.570 (14.48)
0.970 (24.64)
1.370 (34.80)
FIGURE 23: CASE F4
B8-14
1.770 (44.96)
CASE J
CASES
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 300C 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
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
Solder Seal
1.173 (29.79 0.040 dia. (1.02) 0.673 (17.09)
CASE J
Squared corner and dot on top of case indicate pin one.
1
2 0.162 dia (4.11)
Solder Tip-off
0.173 (4.39) 0.000 0.000 0.25 (6.4) 0.210 (5.33) 0.000 0.170 (4.32) 1.370 (34.80) 0.505 max (12.83) 1.770 (44.96) 1.980 (50.29) 0.162 dia (4.11) 1.980 (50.29) 5 4 3
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
Solder Seal
1.173 (29.79 0.040 dia. (1.02) 0.673 (17.09)
Squared corner and dot on top of case indicate pin one.
1
2
3
4
5
Solder Tip-off
0.173 (4.39) 0.000 0.000 0.25 (6.4) 0.210 (5.33) 0.000 0.170 (4.32) 0.570 (14.48) 0.970 (24.64) 1.370 (34.80) 0.505 max (12.83) 1.770 (44.96) 10 9 8 7 6
FIGURE 40: CASE J5
B8-25
QA SCREENING 85C PRODUCTS
85C PRODUCTS
TEST (85C Products excluding HR products) PRE-CAP INSPECTION Method 2017 TEMPERATURE CYCLE (10 times) Method 1010, Cond. B, -55C to 125C CONSTANT ACCELERATION Method 2001, 500 g BURN-IN 96 hours at 70C ambient (typical) FINAL ELECTRICAL TEST MIL-PRF-38534, Group A Subgroups 1 and 4: +25C case HERMETICITY TESTING Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) FINAL VISUAL INSPECTION Method 2009 yes yes no no yes yes yes no yes yes no yes no yes no yes yes yes STANDARD /ES
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

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