MSM SERIES

5 WATT

EATURES

· 55°C to +125°C operation
· 16 to 40 VDC input
· Surface mountable
· Will withstand solder reflow
· Transient protection up to 80V/120 ms,

meets MIL-STD-704A requirements

· Inhibit function
· Fully isolated
· Ultra-wide bandwidth magnetic feedback
· Up to 82% efficiency
· Indefinite short circuit protection
· Undervoltage shutdown below 10 Vin

DESCRIPTION

The MSM SeriesTM of DC/DC converters delivers up to 5 watts in a
surface mountable package. The use of commercially available
discrete components, printed wiring board construction, and surface
mount technology keep costs low. Mature design technology and
severe derating maintain high-reliability, providing full power opera-
tion over the full military temperature range of 55 to +125°C.

Output voltages of 3.3, 5, 5.2, 12, 15, ±12, or ±15 operate from an
input range of 16 to 40 VDC. Operation below 16 volts is possible at
reduced power while still maintaining output regulation. The
converters are rated for input transients up to 80 V for up to 120
milliseconds which meets the requirements for MIL-STD-704A.

ONVERTER

ESIGN

The converters incorporate a flyback topology with a constant
frequency to minimize EMI and noise. The pulse-width-modulator is
constructed of discrete devices to allow to the use of mature tech-
nologies and assure operation over the full temperature range. A
proprietary magnetic isolator, designed with feed-forward and load
correction, provides nearly instantaneous output control for good
output regulation.

NHIBIT

UNCTION

MSM Series converters provide a TTL open collector-compatible
inhibit feature that can be used to disable internal switching and
inhibit the unit's output. Inhibiting in this manner results in low
standby current, and no generation of switching noise.

The converter is inhibited when the TTL compatible low (

0.8 V) is

applied to the inhibit pin. The unit is enabled when the pin, which is
internally connected to a pull-up resistor, is left unconnected or is
connected to an open collector gate. The open circuit output voltage
associated with the inhibit pin is 9 to 11 V. In the inhibit mode, a
maximum of 0.5 mA must be sunk from the inhibit pin.

ROTECTION

EATURES

Undervoltage lockout prevents the MSM Series converters from
operating below approximately 10 VDC input. This circuitry can
prevent system shutdown problems in starting "constant power"
devices at low input voltages. All models include a soft-start function
to prevent large current draw and minimize overshoot under all load
and line conditions. The MSM Series of converters also provide
short circuit and overload protection. Short circuit internal dissipation
is lower than the internal dissipation which occurs during full load
conditions.

URFACE

OUNTABLE

ACKAGING

The MSM Series of DC/DC converters can be surface mounted or
hand-soldered. Maximum reflow temperature for surface mounting
the MSM converter is 230°C for a maximum of 30 seconds. SN60,
62, or 63 are the recommended types of solder. Hand soldering
should not exceed 300°C for 10 seconds per pin.

DC/DC C

ONVERTERS

28 V

OLT

NPUT

Size (max.):

2.01 x 2.01 x 0.312 inches (51.1 x 51.1 x 7.9 mm)

Weight:

20 grams maximum

MODELS

VDC O

UTPUT

SINGLES

3.3

12
15

DUALS

±12
±15

TYPICAL CHARACTERISTICS

RECOMMENDED OPERATING CONDITIONS

ABSOLUTE MAXIMUM RATINGS

INHIBIT

MSM SERIES
5 WATT

DC/DC C

ONVERTERS

SINGLE OUTPUT MODELS

MSM283R3S

MSM2805S

MSM2812S

MSM2815S

PARAMETER

CONDITIONS

MIN TYP MAX

MIN

TYP MAX

MIN

TYP

MAX

MIN

TYP MAX

UNITS

OUTPUT VOLTAGE

Tc = 25°C

3.25

3.3

3.35

4.93

5.08 11.82

12.18 14.78

15.23

VDC

OUTPUT CURRENT

= 16 TO 40 VDC

1.52

1.0

0.42

0.33

OUTPUT POWER

= 16 TO 40 VDC

OUTPUT RIPPLE

10 kHz - 2 MHz

250

200

180

150

mV p-p

VOLTAGE

Tc = 55°C TO +125°C

1800

1500

1200

1000

LINE REGULATION

= 16 TO 40 VDC

120

150

LOAD REGULATION

NO LOAD TO FULL

150

250

350

400

INPUT VOLTAGE

CONTINUOUS

VDC

NO LOAD TO FULL

TRANSIENT 120 ms

INPUT CURRENT

NO LOAD

FULL LOAD

242

235

230

223

INHIBITED

4.5

INPUT RIPPLE

10k Hz - 10 MHz

mA p-p

CURRENT

Tc = 55°C TO +125°C

180

150

120

100

EFFICIENCY

Tc = 25°C

LOAD FAULT

POWER DISSIPATION

OVERLOAD

1.9

1.8

1.7

1.5

SHORT CIRCUIT

0.9

0.8

0.7

RECOVERY

8.5

7.5

OUTPUT CURRENT

TRIP POINT

2.2

1.5

0.7

0.56

SHORT CIRCUIT

2.3

1.6

0.8

0.6

STEP LOAD

50 %100% 50%

RESPONSE

TRANSIENT

350

400

mV pk

RECOVERY

0.8

1.0

STEP LINE

16 TO 40 TO 16 V

RESPONSE

TRANSIENT

400

500

mV pk

RECOVERY

1.5

2.0

START-UP

DELAY

0 TO 28 VIN

OVERSHOOT

250

300

350

400

mV pk

Input Voltage

· 16 to 40 VDC

Output Power

· 5 W

Power Dissipation

· 1.9 W

Lead Soldering Temperature (10 sec per lead)

· 300°C

Storage Temperature Range (Base plate)

· 55°C to +130°C

Input Voltage Range

· 16 to 40 VDC continuous
· 80 V for 120 msec transient

Case Operating Temperature (Tc)

· 55°C to +125°C full power
· 55°C to +130°C absolute

Derating Output Power/Current (Tc)

· Linearly from 100% at 125°C to 0% at 130°C

Inhibit TTL Open Collector

· Logic low (output disabled)
· Inhibit pin current 0.34 mA typ
· Referenced to input common
· Logic high (output enabled) open collector

Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.

Output Voltage Temperature Coefficient

· 200 ppm/°C typical

Temperature Rise (Still Air)

· 18°C / watt dissipated, typical

Input to Output Capacitance

· 100 pF typical

Undervoltage Lockout

· 10 V input typical

Current Limit

· 160% of full load typical

Isolation

· 100 megohm minimum at 500 V

Conversion Frequency (kHz)

· 25°C, 200 min, 300 typ, 400 max

Inhibit Pin Voltage (unit enabled)

· 10 V, typical

Notes:
1. Short circuit is measured with a 50 mohm resistive load.
2. Time to settle within 1% of V

OUT

3. Transition

10 µs.

MSM SERIES

5 WATT

DC/DC C

ONVERTERS

Notes:
1. The maximum specification indicates the converter's total output power, Up

to 75% of the total is available from either output providing the other output
maintains a minimum of 25% of the total power.

2. Short circuit is measured with a 50 mohm resistive load.

3. Time to settle within 1% of V

OUT

4. Transition

10 µs.

DUAL OUTPUT MODELS

MSM2812D

MSM2815D

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP MAX

UNITS

OUTPUT VOLTAGE

Tc = 25°C

±11.82 ±12

±12.18

±14.78 ±15 ±15.23

VDC

OUTPUT CURRENT

= 16 TO 40 VDC

±208

±167

OUTPUT POWER

= 16 TO 40 VDC

OUTPUT RIPPLE

10 kHz - 2 MHz

180

150

VOLTAGE +V

OUT

Tc = 55°C TO +125°C

1200

1000

mV p-p

OUT

10 kHz - 2 MHz

180

150

Tc = 55°C TO +125°C

1200

1000

LINE REGULATION

OUT

120

150

= 16 TO 40 VDC

OUT

120

150

LOAD REGULATION

OUT

350

400

NO LOAD TO FULL

OUT

350

400

INPUT VOLTAGE

CONTINUOUS

VDC

NO LOAD TO FULL

TRANSIENT 120 ms

INPUT CURRENT

NO LOAD

FULL LOAD

230

220

INHIBITED

4.5

INPUT RIPPLE

10 kHz - 2 MHz

mA p-p

CURRENT

Tc = 55°C TO +125°C

120

100

EFFICIENCY

LOAD FAULT

POWER DISSIPATION

OVERLOAD

1.7

1.5

SHORT CIRCUIT

0.8

0.7

RECOVERY

8.0

7.5

OUTPUT CURRENT

TRIP POINT

350

280

SHORT CIRCUIT

380

300

STEP LOAD 50

%100%

50%

RESPONSE ± V

OUT

TRANSIENT

400

mV pk

RECOVERY

STEP LINE

16 TO 40 TO 16 V

RESPONSE ± V

OUT

TRANSIENT

500

mV pk

RECOVERY

STARTUP ± V

OUT

DELAY

3.5

OVERSHOOT

350

400

mV pk

Electrical Characteristics: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.

MSM SERIES

5 WATT

DC/DC C

ONVERTERS

27922 DTS Rev B This revision supercedes 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. MSM Series is a trade-
mark of Interpoint. Copyright © 2000-2001 Interpoint. All rights reserved.

2.00 (50.8)

0.02 (0.51)

0.00

0.25

0.65

0.95

1.25

1.65

IGURE

2: MSM S

ERIES

UTLINE

RAWING

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. Pin
spacing tolerance is ±0.010

CAUTION
Maximum reflow temperature for surface mounting the MSM converter is 230°C for a maximum of 30 seconds. SN60,
62, or 63 are the recommended types of solder. Hand soldering should not exceed 300°C for 10 seconds per pin.

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.

0.312 max. (7.92)

Contact Information:

Interpoint Headquarters USA
Phone:

1-800-822-8782
+425-882-3100

Email:

power@intp.com

www.interpoint.com

Interpoint UK
Phone:

+44-1252-815511

Email:

poweruk@intp.com

Interpoint France
Phone:

+33-134285455

Email:

powerfr@intp.com

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ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: MSM2815D