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NOT RECOMMENDED FOR NEW DESIGNS Features
* * * * * * * * *
DC/DC COnVerters 28 VOlt input
MTW SERIES 30 WATT
-55C to +85C operation 18 to 40 VDC input (19 to 40 VDC MTW2805S) Fully isolated
MODELS VDC Output
single
50 V for 50 ms transient protection Fixed frequency Inhibit function
5 12 15
Dual
12 15
Remote sense on MTW2805S model Indefinite short circuit protection Up to 86% efficiency
Size (max.): 2.720 x 1.350 x 0.505 inches (69.09 x 34.29 x 12.83 mm) See case J5 for dimensions. Weight: 60 grams max. Screening: Standard or ES. See screening table for more information.
description
The MTW SeriesTM of DC/DC converters offer the high efficiency and wide input voltage range of switching regulators with the isolation, excellent output regulation, and low output noise typical of linear regulators without requiring the use of external components. MTW converters are built using thick-film hybrid technology and are sealed in metal packages for military, aerospace and other high-reliability applications. Unscreened models are sealed with solder and are guaranteed to pass a gross leak test (maximum leak rate of 1 x 10-3 atm.-cc/sec). Environmentally screened models (/ES) are hermetically sealed with solder and will pass a fine leak and gross leak test as described in Section C2. MTW converters use a constant frequency pulse-width modulated switching regulator design operating in the forward mode with a clock switching frequency of 240 to 300 kHz. Isolation is achieved through the use of a transformer in the forward power circuit and an optocoupler in the feedback control loop. The full load output power of 30 watts is available over the entire 18 to 40 VDC (19 to 40 VDC for MTW2805S) input range. On dual output models, up to 90% of full power is available from either output up to a combined total of 30 watts. Input transients of 50 V to up to 50 ms. duration will not impair normal operation. Efficiency is high over the entire input voltage range and from approximately 25% of full load to full load (see typical efficiency curves). MTW converters are provided with indefinite short circuit protection through the use of current limiting techniques. When the output current reaches approximately 125% of the full rated load, the output voltage begins to reduce to protect the converter. The converter can sustain a true short circuit condition indefinitely. With temperatures measured at the baseplate, the MTW Series is rated for full power operation from -55C to +85C with the power derated linearly to 0 at 115C. The MTW's flanged case facilitates
Crane Aerospace & Electronics Electronics Group (Interpoint Brand) PO Box 97005 * Redmond WA 98073-9705 425.882.3100 * power@crane-eg.com www.interpoint.com
removal of heat and provides for mechanically secure mounting. In applications requiring full power operation, an efficient heat sink attached to the baseplate is required. An inhibit is provided to allow power shut-down and start-up from a logic input. An open circuit on the inhibit pin allows normal operation, while a connection between the inhibit pin and input common disables the internal oscillator and shuts down the output. In the inhibit mode, approximately 1 mA must be sunk from pin the inhibit pin. An open collector, active low, is required to activate the inhibit function. All MTW converters are characterized by close output regulation over the entire operating range with no minimum power requirement. On 12 and 15 VDC output models, typical line regulation is 10 to 20 mv. The MTW2805S model uses external remote sense pins which monitor the voltage at the load to provide typical regulation in the 5 to 7 mV range. The voltage sensing circuitry operates in a true four terminal voltage mode, eliminating the adverse effects of line resistance voltage drops. The remote sense pins may be left unconnected, but see cautions in on the following pages. For normal operation, remote sense pins should be connected to their respective output pins. The MTW Series offers low noise on both the input and output line. in the single output converters, two-section L-C filters at both the input and output limit output ripple voltage and minimize reflected ripple on the input line. A small value (1000 pF, 500 V) ceramic capacitor connected between the case and input common pin of the single volt output models will reduce EMI on the input lines to levels near those required by MIL-STD-461C's CE03 standard. In the dual output converters, single-section L-C filters are used at the input and outputs. If compliance with MIL-STD-461 is necessary, use of Interpoint's FMA416 EMI filter or FM-704A transient suppressor is recommended.
Page 1 of 6 MTW Rev C 20100212
DC/DC COnVerters
absolute maximum ratings
input Voltage * 18 to 40 VDC (19 to 40 VDC MTW2805S) output power * 30 watts Lead soldering temperature (10 sec per lead) * 300C storage temperature range (case) * -55C to +125C output Voltage temperature coefficient * 100 ppm/C, typical input to output capacitance * 80 pF typical single output models * 70 pF typical MTW2812D * 60 pF typical MTW2815D current Limit * 125% of full load typical isolation * 100 megohm minimum at 500 V conversion Frequency * 240 to 300 kHz inhibit pin Voltage (unit enabled) * 11 to 15 V single output models * 8 to 12 V MTW2812D * 10 to 14 V MTW2815D
MTW SERIES 30 WATT
typical characteristics
recommended operating conditions
input Voltage range * 18 to 40 VDC continuous (19 to 40 MTW2805S) * 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
inhibit
CAUTION Permanent damage to the MTW2805S will result if pin 6 is shorted to ground. Damage may also result if pin 4 or pin 5 is disconnected from the load during operation with the remote sense leads connected to the load. If remote sense pins are not connected to the load, the output voltage of the MTW2805S will rise to approximately 6.2 VDC measured across pins 4 and 5.
inhibit ttL open collector * Logic low (output disabled) Inhibit pin current 1 mA typical * Referenced to input common * Logic high (output enabled) Open collector
Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
SINgLE OUTPUT MODELS paraMeter
Output VOltage Output Current Output pOwer Output ripple line regulatiOn1 lOaD regulatiOn1 input VOltage tC = -55C tO +85C input Current tC = -55C tO +85C bw 2 MHz Min tO MaX Vin nO lOaD tO full nO lOaD tO full transient 50 ms nO lOaD full lOaD inhibiteD input ripple effiCienCY start-up DelaY2 OVershOOt bw 2 MHz
MTW2805S Min 4.95 -- -- -- -- -- 19 -- -- -- -- -- 80 -- -- tYp 5.0 -- -- 30 7 5 28 -- 15 -- -- 5 82 15 300 MaX Min 5.05 6.0 50 20 20 40 50 20 1370 15 10 -- -- --
MTW2812S tYp 12.0 -- -- 30 10 10 28 -- 20 -- -- 10 84 30 400 MaX Min 11.88 -- -- -- -- 18 -- -- -- -- -- 82 -- --
MTW2815S tYp 15.0 -- -- 30 10 10 28 -- 20 -- -- 10 86 40 400 MaX 15.15 2.0 30.0 65 25 20 40 50 35 1400 22 20 -- -- --
COnDitiOns
units VDC A W mV p-p mV mV VDC mA
12.12 14.85 2.5 30.0 65 25 20 50 35 1400 22 20 -- -- -- -- -- -- -- -- -- -- -- -- 84 --
30.0 --
40 18
mA p-p % ms mV
----
Notes 1. For MTW2805S, with the remote sense pins connected to the load and no resistance between the output pins and load.
2. A low output impedance power source is required on the input to realize this start-up time. If less than full surge current is available, start-up time will be longer
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Page 2 of 6 MTW Rev C 20100212
DC/DC COnVerters
Electrical Characteristics: 25C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
DUAL OUTPUT MODELS paraMeter
Output VOltage
MTW SERIES 30 WATT
MTW2812D Min 11.88 11.88 -- -- -- -- -- -- -- 18 -- -- -- -- -- 81 -- -- tYp 12.0 12.0 -- -- 50 10 20 2.5 2.5 28 -- 35 -- -- 15 84 30 500 MaX 12.12 12.12 2.5 30.0 85 Min
MTW2815D tYp 15.0 15.0 -- -- 50 10 20 2.2 2.2 28 -- 45 -- -- 15 85 30 500 MaX 15.15 15.15 2.0 30.0 85 25 50 3.2 3.2 40 50 60 1400 24 50 -- -- -- 14.85 14.85 -- -- --
COnDitiOns + VOut - VOut
units VDC A W mV p-p mV mV % VDC mA
Output Current Output pOwer1 Output ripple line regulatiOn lOaD regulatiOn CrOss regulatiOn2 tC = -55C tO +85C bw 2 MHz Vin = 18 tO 40 nO lOaD tO full
25 -- 50 -- 3.5 -- 3.5 -- 40 50 1350 24 50 -- -- 18 -- -- -- -- -- --
+ VOut - VOut
COntinuOus transient 50 ms nO lOaD full lOaD inhibiteD bw 2 MHz DelaY3 OVershOOt
input VOltage tC = -55C tO +85C input Current
50 --
input ripple effiCienCY start-up
mA p-p % ms mV
-- 82
Notes 1. Up to 90% of full power is available from either output providing the total power does not exceed 30 watts. 2. The effect on the output voltage of either output (held at 3 watts) when the other output is varied from 3 to 27 watts.
3. A low output impedance power source is required on the input to realize this start-up time. If less than full surge current is available, start-up time will be longer
pin out
pin 1 2 3 4 5 6 7 8 9 10 MTW2805S Positive Input Inhibit Sense Return Output Common Positive Output Positive Sense Case Ground No connection No connection Input Common single output Positive Input Inhibit No connection Output Common Positive Output No connection Case Ground No connection No connection Input Common dual output Positive Input No connection Positive Output Output Common Negative Output No connection Case Ground Inhibit Input Common Input Common
Squared corner and dot on top of cover indicate pin one.
1
2
3
4
5
See case J5 for dimensions.
10 9 8 7 6
BOTTOM VIEW MTW
figure 1: pin Out
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Page 3 of 6 MTW Rev C 20100212
DC/DC COnVerters
Typical Performance Curves: 25C Tc
88 86 84 19 V 82 80 78 76 74 72 70 68 5 10 15 20 25 30 40 V 28 V 88 86 18 V 84 82 80 78 76 74 72 70 68 5 10 15 20 25 30 40 V 88 86 84 28 V 18 V
MTW SERIES 30 WATT
28 V
Efficiency (%)
Efficiency (%)
Efficiency (%)
82 80 78 76 74 72 70 68 5 10 15 20 25 30 40 V
Output Power (Watts)
Output Power (Watts)
Output Power (Watts)
MTW2805S Efficiency
figure 2
MTW2812S Efficiency
figure 3
MTW2812D Efficiency
figure 4
88 86 84 82 80 78 76 74 72 70 68 5 10 15 20 25 30 40 V 18 V 28 V
18
18
Input Voltage (Volts)
17
Inupt Voltage (Volts)
17
Efficiency (%)
MTW2812S
MTW2815D
16 MTW2815S 15
16 MTW2812D 15
14
Output Power (Watts)
5
Output Power (Watts)
10
15
20
25
30
14
5
Output Power (Watts)
10
15
20
25
30
MTW2815D Efficiency
figure 5
MTW2812S and MTW2815S Low Line Dropout
figure 6
MTW2812D and MTW2815D Low Line Dropout
figure 7
model numbering key
Base Model Voltage In Output Voltage Number of Outputs (S = single, D = dual) Screening (Standard screening has no designator in this position.) MTW 28 12 D / ES
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Page 4 of 6 MTW Rev C 20100212
DC/DC COnVerters
BOTTOM VIEW CASE J5
MTW SERIES 30 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 8: Case J5
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Page 5 of 6 MTW 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)
0.000
0.170 (4.32)
DC/DC COnVerters
MTW SERIES 30 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.
MTW Series DC/DC Converters, MTW 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. MTW Series is a trademark of Interpoint. Copyright (c) 1999 - 2010 Interpoint Corporation. All rights reserved. www.interpoint.com
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