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not reCoMMenDeD For neW DesIGns Features
* * * * * * * *
DC/DC Converters 28 volt Input
mTO seRIes 15 WATT
-55C to +85 C operation 16 to 36 VDC input Fully isolated 50 V for 50 ms transient protection Fixed frequency switching Inhibit function Indefinite short circuit protection Up to 79% efficiency
mODels VDC Output +5 & 12 +5 & 15
triple
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.
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
COnVerter Design
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. 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.
5 Positive Auxiliary Output
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
paCkaging
Pulse Width Modulator
Short Circuit Amp Input 10 Common 8 Inhibit Case Ground 7
Pass Transistor
Linear Regulator Linear Regulator
4 Pass Transistor
Figure 1: simpliFieD sChematiC
Negative Auxiliary Output
Crane Aerospace & Electronics Electronics Group (Interpoint Brand) PO Box 97005 * Redmond WA 98073-9705 425.882.3100 * power@crane-eg.com www.interpoint.com
Page 1 of 6 MTO Rev C 20100212
DC/DC Converters
absolute maximum ratings
output power * 15 watts Lead soldering temperature (10 sec per lead) * 300C storage temperature range (case) * -65C to +125C input Voltage range * 16 to 36 VDC continuous * 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
mTO seRIes 15 WATT
recommended operating conditions
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
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
inhibit
electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
TRIPle OUTPUT mODels parameter
Output VOltage
mTO2812T min 4.95 11.88 11.88 100 -- -- -- -- -- -- -- -- -- -- -- 16 -- -- -- -- -- tYp 5.0 12.0 12.0 -- -- -- -- -- -- -- -- 5 30 10 30 28 -- -- -- 8 20 maX min 5.05 4.95
mTO2815T tYp 5.0 15.0 15.0 -- -- -- -- -- -- -- -- 5 30 10 30 28 -- -- -- 8 20 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 50
COnDitiOns
main
units
+ auXiliarY - auXiliarY
Output Current main1 auXiliarY Output pOwer main
12.12 14.85 12.12 14.85 2000 100 208 -- 10.0 -- 2.5 2.5 15 80 30 10 48 20 48 50 30 700 10 50 -- -- -- -- -- -- -- -- -- -- -- -- -- --
VDC
mA
+ auXiliarY - auXiliarY
tOtal Output ripple bw = 1 mhz line regulatiOn Vin = min tO maX lOaD regulatiOn nO lOaD tO Full input VOltage main
W
auXiliarY
main
mV p-p mV mV VDC V mA
auXiliarY
main
auXiliarY
COntinuOus transient 50 ms
36 16
input Current
nO lOaD Full lOaD inhibiteD
input ripple Current
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.
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Page 2 of 6 MTO Rev C 20100212
DC/DC Converters
Positive Input (1) Optional Pullup 2N3904 Inhibit 10K 3.9K Input Common (10) (2) 13V 3K BIAS
mTO seRIes 15 WATT
9K
Figure 2: inhibit interFaCe eXample
pin out
pin 1 2 3 4 5 6 7 8 9 10 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 cases F4 and J5 for dimensions Figure 3: pin Out
Typical Performance Curve: 25C Tc
model numbering key
EFFICIENCY (%)
82 80 78 76 74 72 70 68 66 2 4 6 8 10 12 14 16 36 VIN 18 VIN 28 VIN
Output Voltage (Aux. Vout) Number of Outputs (T = triple)
Base Model Input Voltage
MTO
28 12
T
F / ES
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
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Page 3 of 6 MTO Rev C 20100212
DC/DC Converters
BOTTOM VIEW CASE F4
mTO seRIes 15 WATT
Solder Seal
1.350 max (4.39) 1.173 (29.79)
Squared corner and dot on top of case indicate pin one.
0.040 dia. (1.02)
1
2
3
4
5
Solder Tip-off
0.173 (4.39) 0.000
10
9
8
7
6
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
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. 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 (c) 1999-2006 Interpoint Corp. All rights reserved.
Figure 5: Case F4
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Page 4 of 6 MTO Rev C 20100212
1.950 max (49.53)
0.505 max (12.83)
0.000
0.000
0.170 (4.32)
0.570 (14.48)
0.970 (24.64)
1.370 (34.80)
1.770 (44.96)
0.250/0.300 (6.35/7.62)
DC/DC Converters
BOTTOM VIEW CASE J5
mTO seRIes 15 WATT
Solder Seal
1.350 max. (34.29) 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
0.162 dia. (4.11)
Solder Tip-off
0.173 (4.39) 0.000
10
9
8
7
6
0.570 (14.48)
0.970 (24.64)
1.370 (34.80)
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 300C 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 (c) 1999-2010 Interpoint Corp. All rights reserved.
Figure 6: Case j5
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Page 5 of 6 MTO Rev C 20100212
1.770 (44.96)
2.150 (54.61)
0.505 max (12.83)
0.000
0.25 (6.4)
0.210 (5.33)
0.170 (4.32)
0.000
DC/DC Converters
mTO seRIes 15 WATT
STANDARD AND /ES (NON-QML) PRODUCTS ENVIRONMENTAL SCREENING 1
test perFormed Pre-cap Inspection Method 2017, 2032 Temperature Cycle (10 times) Method 1010, Cond. B, -55C to +125C, ambient Constant Acceleration Method 2001, 500 g Burn-in Method 1015 3 96 hours Final Electrical Test MIL-PRF-38534, Group A Subgroups 1 and 4: +25C case Hermeticity Test Fine Leak, Method 1014, Cond. A Gross Leak, Method 1014, Cond. C Gross Leak, Dip (1 x 10-3) Final visual inspection Method 2009
Test methods are referenced to mIl-sTD-883 as determined by mIl-PRF-38534. Notes:
standard non-Qml2
yes no no
/es non-Qml2
yes yes yes
no yes no no yes yes
yes yes yes yes no yes
Test methods are referenced to mIl-sTD-883 as determined by mIl-PRF-38534.
1. refers to products that do not offer QML screening. Notes: 2. standard and /es, non-Qml products, do not meet all of the requirements of mIl-PRF-38534. 1. 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, non-Qml products, do not meet all of the requirements of mIl-PRF-38534. for the maximum case temperature. 3. Burn-in designed to bring the case temperature to the maximum case temperature of 85C.
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 (c) 1999 - 2010 Interpoint Corporation. All rights reserved. www.interpoint.com
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