INTERPOINT MTW2815D

DC/DC Converters
28 Volt Input
mtw Series
30 Watt
NOT RECOMMENDED FOR NEW DESIGNS
Features
• –55°C to +85°C operation
models
VDC Output
• 18 to 40 VDC input
(19 to 40 VDC MTW2805S)
single
5
12
15
• 50 V for 50 ms transient protection
• Fully isolated
• Fixed frequency
• Remote sense on MTW2805S model
• Inhibit function
• Indefinite short circuit protection
• Up to 86% efficiency
±12
±15
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 Series™ 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 –55°C to +85°C with the power
derated linearly to 0 at 115°C. The MTW’s flanged case facilitates
Crane Aerospace & Electronics
Electronics Group (Interpoint Brand)
PO Box 97005 • Redmond WA 98073-9705
425.882.3100 • [email protected]
www.interpoint.com
dual
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.
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MTW Rev C 20100212
DC/DC Converters
absolute maximum ratings
MTW series
30 Watt
typical characteristics
Input Voltage
•18 to 40 VDC (19 to 40 VDC MTW2805S)
Output Power
•30 watts
Lead Soldering Temperature (10 sec per lead)
•300°C
Storage Temperature Range (Case)
•–55°C to +125°C
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
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)
•–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
inhibit
Inhibit TTL Open Collector
•Logic low (output disabled)
Inhibit pin current 1 mA typical
•Referenced to input common
•Logic high (output enabled)
Open collector
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.
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
single output models
PARAMETER
CONDITIONS
MIN
mtw2805s
mtw2812S
mtw2815s
TYP
MAX MIN
TYP
MAX MIN
TYP
MAX
11.88
12.0
12.12 14.85
15.0
15.15
—
—
output voltage
4.95
5.0
5.05
output current
—
—
6.0
A
—
30.0
—
—
30
50
—
30
65
—
30
65
mV p-p
min to max vin
input ripple
—
7
20
—
10
25
—
10
25
mV
—
5
20
—
10
20
—
10
20
mV
no load to full
19
28
40
18
28
40 18
28
40
transient 50 ms
—
—
50
—
—
50
—
—
50
15
20
—
20
35
—
20
35
1370
—
1400
—
—
15
—
—
22
—
—
22
VDC
no load
—
full load
—
inhibited
—
bw ≤ 2 MHz
—
5
10
—
10
20
—
10
20
mA p-p
80
82
—
82
84
—
84
86
—
%
—
15
—
—
30
—
—
—
300
—
—
400
delay2
overshoot
—
Notes
1.For MTW2805S, with the remote sense pins connected to the load
and no resistance between the output pins and load.
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W
no load to full
efficiency
start-up
30.0
VDC
bw ≤ 2 MHz
input current
—
2.0
tc = -55°C to +85°C
input voltage
tc = -55°C to +85°C
—
—
output ripple
load regulation1
30.0 —
—
output power
line regulation1
—
2.5
UNITS
—
— —
—
1400
mA
40
—
ms
400
—
mV
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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MTW Rev C 20100212
DC/DC Converters
MTW series
30 Watt
Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.
dual output models
PARAMETER
output voltage
mtw2812d
CONDITIONS
+ vout
- vout
TYP
MAX
11.88
12.0
11.88
12.0
—
12.12
14.85
15.0
15.15
85
mV p-p
—
10
25 —
10
25
mV
—
20
50 —
20
50
mV
+ vout
—
2.5
3.5 —
2.2
3.2
—
2.5
3.5 —
2.2
3.2
vin = 18 to 40
- vout
—
—
VDC
50
no load to full
—
2.0
A
30.0
W
continuous
18
28
40
18
28
40
transient 50 ms
—
—
50
—
—
50
no load
—
full load
—
inhibited
—
bw ≤ 2 MHz
efficiency
start-up
15.15
—
load regulation
input ripple
15.0
85
line regulation
input current
14.85
50
—
input voltage
tc = -55°C to +85°C
12.12
UNITS
—
bw ≤ 2 MHz
cross regulation2
MAX
—
—
output ripple
TYP
2.5
tc = -55°C to +85°C
—
MIN
30.0
output current
output power1
mtw2815d
MIN
delay3
overshoot
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.
35
—
50 —
45
%
VDC
60
—
mA
1350
—
1400
—
24
—
—
24
—
15
50
—
15
50
mA p-p
81
84
— 82
85
—
%
—
30
—
—
30
—
ms
—
500
—
—
500
—
mV
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
MTW2805SSingle OutputDual Output
Positive Input
Positive Input
Positive Input
Inhibit
Inhibit
No connection
Sense Return
No connection Positive Output
Output Common
Output Common Output Common
Positive Output
Positive Output Negative Output
Positive Sense
No connection No connection
Case Ground
Case Ground
Case Ground
No connection
No connection Inhibit
No connection
No connection Input Common
Input Common
Input Common Input Common
Squared corner and dot on
top of cover indicate pin one.
1
2
3
4
BOTTOM VIEW
MTW
See case J5 for dimensions.
10
9
8
7
Figure 1: Pin Out
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MTW Rev C 20100212
5
6
DC/DC Converters
MTW series
30 Watt
Typical Performance Curves: 25°C Tc
86 18 V
86
84
84
82
82
19 V
Efficiency (%)
80
78
76
40 V
28 V
80
78
40 V
76
74
72
70
70
70
68
68
15
20
25
30
68
5
10
20
15
25
40 V
78
72
10
28 V
76
74
5
18 V
80
72
74
30
5
10
15
20
25
30
Output Power (Watts)
Output Power (Watts)
Output Power (Watts)
MTW2805S Efficiency
Figure 2
MTW2812S Efficiency
Figure 3
MTW2812D Efficiency
Figure 4
88
18
18
18 V
86
84
Input Voltage (Volts)
28 V
82
80
78
76
74
40 V
72
17
MTW2812S
16
MTW2815S
15
Inupt Voltage (Volts)
Efficiency (%)
28 V
82
Efficiency (%)
88
86
84
Efficiency (%)
88
88
17
MTW2815D
16
MTW2812D
15
70
68
5
10
15
20
25
30
Output Power (Watts)
MTW2815D Efficiency
Figure 5
14
5
10
15
20
25
30
Output Power (Watts)
MTW2812S and MTW2815S
Low Line Dropout
Figure 6
model numbering key
Base Model
Voltage In
MTW
28 12 D / ES
Output Voltage
Number of Outputs
(S = single, D = dual)
Screening
(Standard screening has no designator
in this position.)
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Page ­­­­­­­­­­­­­­­4 of 6
MTW Rev C 20100212
14
5
10
15
20
25
Output Power (Watts)
30
MTW2812D and MTW2815D
Low Line Dropout
Figure 7
DC/DC Converters
MTW series
30 Watt
BOTTOM VIEW CASE J5
Solder Seal
Squared corner and dot on top
of case indicate pin one.
1.350 max. (34.29)
1
2
3
4
5
10
9
8
7
6
0.170 (4.32)
0.570 (14.48)
0.970 (24.64)
1.370 (34.80)
1.770 (44.96)
1.173
(29.79
0.040 dia.
(1.02)
0.162 dia.
(4.11)
0.673
(17.09)
Solder Tip-off
0.173
(4.39)
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 300°C 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 © 1999-2010 Interpoint Corp. All rights reserved.
Figure 8: Case J5
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Page ­­­­­­­­­­­­­­­5 of 6
MTW Rev C 20100212
2.150 (54.61)
0.000
0.210
(5.33)
0.25 (6.4)
0.000
0.505 max
(12.83)
0.000
DC/DC Converters
MTW series
30 Watt
STANDARD AND /ES (NON-QML) PRODUCTS
ENVIRONMENTAL SCREENING 1
standard
non-Qml2
/es
non-Qml2
Pre-cap Inspection
Method 2017, 2032
yes
yes
Temperature Cycle (10 times)
Method 1010, Cond. B, -55°C to +125°C, ambient
no
yes
Constant Acceleration
Method 2001, 500 g
no
yes
Burn-in
Method 1015 3
96 hours
no
yes
Final Electrical Test MIL-PRF-38534, Group A
Subgroups 1 and 4: +25°C case
yes
yes
Hermeticity Test
Fine Leak, Method 1014, Cond. A
Gross Leak, Method 1014, Cond. C
Gross Leak, Dip (1 x 10-3)
no
no
yes
yes
yes
no
Final visual inspection
Method 2009
yes
yes
test perFormed
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
Notes:
1. refers to products that do not offer QML screening.
Notes:
Standard and /ES, non-QML products, do not meet all of the requirements of MIL-PRF-38534.
1.2.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,
products, do not meet all of the requirements of MIL-PRF-38534.
for the maximum
casenon-QML
temperature.
3. Burn-in designed to bring the case temperature to the maximum case temperature of 85°C.
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 © 1999 - 2010 Interpoint Corporation. All rights reserved. www.interpoint.com
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