MODELS

VDC O

UTPUT

Size (max.): 1.075 x 1.075 x 0.270 inches (27.31 x 27.31 x 6.86 mm)
Weight:

15 grams maximum.

Screening:

Standard, ES, or 883 (Class H).

SINGLE

5.2

12
15
60

DUAL

±5

±12
±15

DESCRIPTION

The MSA SeriesTM of high frequency DC/DC converters offers a new
standard of performance for low power, military/aerospace grade
DC/DC converters. MSA parts provide up to 5 watts output power
over the full military temperature range with up to 76% efficiency.
Thick-film hybrid techniques provide military/aerospace reliability
levels and optimum miniaturization. The hermetically sealed case is
only 1.075 by 1.075 inches -- with a height of only 0.270 inches.
Power density for the MSA Series parts is 16 watts per cubic inch.

The MSA Series' small size, low height, and hermetically sealed
metal enclosures make them ideal for use in military, aerospace and
other high reliability applications. Units are available with standard,
screening, "ES", and fully compliant SMD "883" screening. See
page 8 for screening options and descriptions.

ONVERTER

ESIGN

The MSA converters are switching regulators that use a flyback
converter design with a constant switching frequency of 550 kHz.
They are regulated, isolated units using a pulse width modulated
topology and built as high reliability thick-film hybrids. Isolation
between input and output circuits is provided with a transformer in
the forward power path and an optical link in the feedback control
loop. Excellent input line transient response and audio rejection is
achieved by an advanced feed-forward compensation technique.
Negative output regulation is maintained by tightly coupled
magnetics. Up to 4 watts, 80% of the total output power, is available
from either output, provided that the opposite output is simultane-
ously carrying 20% of the total power. Each output must carry a
minimum of 20% of the total output power in order to maintain spec-
ified regulation on the negative output. Predictable current limit is
accomplished by direct monitoring of the output load current, which
results in a constant current output above the overload point.
Internal input and output filters eliminate the need for external
capacitors.

IDE

OLTAGE

ANGE

The MSA converters are designed to provide full power operation
over a full 16 to 40 VDC voltage range. Operation below 16 volts,
including MIL-STD-704E emergency power conditions is possible
with derated power. Please refer to the low line dropout graphs
(Figures 17 and 18) for details. A low voltage lockout feature keeps
the converter shutdown below approximately 13 VDC to ensure
smooth initialization.

MPROVED

YNAMIC

ESPONSE

The MSA feed-forward compensation system provides excellent
dynamic response and noise rejection. Audio rejection is typically 50
dB. The minimum to maximum step line transient response is typi-
cally less than 1%.

NHIBIT

UNCTION

MSA 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 4 mA must be sunk from the inhibit pin.

NDERVOLTAGE

OCKOUT AND

RANSIENT

ROTECTION

Undervoltage lockout helps keep system current levels low during
initialization or re-start operations. They can withstand short term
transients of up to 50 volts without damage.

DC/DC C

ONVERTERS

28 V

OLT

NPUT

MSA SERIES

5 WATT

EATURES

· 55° to +125°C operation
· 16 to 40 VDC input
· Fully isolated
· Optocoupler feedback
· Fixed frequency, 550 kHz typical

(400 kHz typ. 60 V output model)

· Topology Flyback
· 50 V for up to 50 ms transient protection
· Inhibit function
· Indefinite short circuit protection
· Up to 76% efficiency, 16 W/in

RECOMMENDED OPERATING CONDITIONS

TYPICAL CHARACTERISTICS

INHIBIT

ABSOLUTE MAXIMUM RATINGS

Input Voltage

· 16 to 40 V

Output Power

· 5 watts

Lead Soldering Temperature (10 sec per lead)

· 300°C

Storage Temperature Range (Case)

· 65°C to +135°C

MSA SERIES
5 WATT

DC/DC C

ONVERTERS

Output Voltage Temperature Coefficient

· 100 ppm/°C typical

Input to Output Capacitance

· 50 pF typical

Isolation

· 100 megohm minimum at 500 V

Audio Rejection

· 50 dB typical

Conversion Frequency

· 550 kHz typical (400 kHz 60 V model)

450 kHz min, 600 kHz max
350 kHz min, 450 kHz max 60 V model

Inhibit Pin Voltage (unit enabled)

· 9 to 11 V

Input Voltage Range

· 16 to 40 VDC continuous
· 50 V for up to 50 msec transient

Case Operating Temperature (Tc)

· 55°C to +125°C full power
· 55°C to +135°C absolute

Derating Output Power/Current (Tc)

· Linearly from 100% at 125°C to 0% at 135°C

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

Inhibit TTL Open Collector

· Logic low (output disabled)

Logic low voltage

0.8 V max

Inhibit pin current 4 mA max

· Referenced to input common
· Logic high (output enabled)

Open collector

Notes
1. MSA2860S specifications are at 25°Tc only, contact your Interpoint

representative for more information on over temperature specs.

2. Line regulation for /ES and non /ES 2805S models at 16 to 17 V

and 110

°C to 125°C (case) is 5% (max).

3. Indefinite short circuit protection not guaranteed above 125°C (case).
4. Recovery time is measured from application of the transient to point at which

OUT

is within 1% of V

OUT

at final value.

5. Transition time >10µs.

SINGLE OUTPUT MODELS

MSA2805S

MSA285R2S

MSA2812S

MSA2815S

MSA2860S

PARAMETER

CONDITIONS

MIN TYP MAX

MIN

TYP MAX

MIN

TYP

MAX

MIN

TYP MAX

MIN

TYP MAX

UNITS

OUTPUT VOLTAGE

Tc = 55°C TO +125°C

4.95

5.00

5.05

5.15

5.20

5.25 11.88 12.00 12.12 14.85 15.00 15.15

59.1 60.00 60.9

VDC

OUTPUT CURRENT
Tc = 55°C TO +125°C

= 16 TO 40 VDC

1000

962

417

333

OUTPUT POWER

= 16 TO 40 VDC

Tc = 55°C TO +125°C

1.2

OUTPUT RIPPLE
VOLTAGE

10 kHz - 2 MHz

125

350

110

335

200

170

300

mV p-p

LINE REGULATION

= 16 TO 40 VDC

Tc = 55°C TO +125°C

300

LOAD REGULATION

NO LOAD TO FULL

Tc = 55°C TO +125°C

300

INPUT VOLTAGE

Tc = 55°C TO +125°C

NO LOAD TO FULL

CONTINUOUS

VDC

TRANSIENT 50 ms

INPUT CURRENT

NO LOAD

Tc = 55°C TO +125°C

FULL LOAD

250

235

INHIBITED

INPUT RIPPLE

10 kHz - 10 MHz

100

mA p-p

CURRENT

Tc = 55°C TO +125°C

150

EFFICIENCY

LOAD FAULT

3, 4

POWER DISSIPATION

1.5

2.0

1.5

2.0

1.2

1.9

1.2

1.8

SHORT CIRCUIT

RECOVERY

12.5

1.5

STEP LOAD

50% - 100% - 50%

RESPONSE

4, 5

TRANSIENT

100

250

100

250

150

375

200

500

mV pk

RECOVERY

100

250

100

250

200

500

200

500

µs

STEP LINE TRANSIENT
RESPONSE

4, 5

16 TO 40 V

150

200

125

mV pk

40 TO 16 V

150

100

250

125

RECOVERY

16 TO 40 V

100

250

100

250

625

250

625

µs

40 TO 16 V

200

500

200

500

250

625

250

625

START-UP

DELAY

OVERSHOOT

120

150

mV pk

MSA SERIES

5 WATT

DC/DC C

ONVERTERS

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

Notes
1. Up to 4 watts (80% of full power) is available from either output providing the

opposite output is carrying 20% of total power.

2. Shows regulation effect on the minus output during the defined cross loading

conditions. See Figures 15 and 16.

3. Indefinite short circuit protection not guaranteed above 125°C (case).
4. Recovery time is measured from application of the transient to point at which

OUT

is within 1% of V

OUT

at final value.

5. Transition time >10µs.

DUAL OUTPUT MODELS

MSA 2805D

MSA2812D

MSA2815D

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

OUTPUT VOLTAGE

OUT

4.95

5.00

5.05

11.88

12.00

12.12

14.85

15.00

15.15

VDC

OUT

4.9

5.0

5.1

11.76

12.00

12.24

14.70

15.00

15.30

OUTPUT CURRENT

= 16 to 40 VDC

Tc = 55°C to +125°C

±500

800

±208

333

±167

267

OUTPUT POWER

= 16 to 40 VDC

Tc = 55°C to +125°C

OUTPUT RIPPLE VOLT.

10 kHz - 2 MHz

150

140

150

mV p-p

LINE REGULATION

Tc = 55°C to +125°C

Vin = 16 to 40 VDC

OUT

180

LOAD REGULATION

Tc = 55°C to +125°C

NO LOAD TO FULL

OUT

200

CROSS REGULATION

= 20 - 80 %, P

= 80 - 20%

= 20 - 80 %, +P

= 80 - 20%

= 50 - 10 %, P

= 50%

3.7

= 50 - 10 %, +P

= 50%

INPUT VOLTAGE

NO LOAD TO FULL

Tc = 55°C to +125°

~CONTINUOUS

VDC

TRANSIENT 50 msec

INPUT CURRENT

NO LOAD

Tc = 55°C to +125°C

FULL LOAD

248

235

INHIBITED --

INPUT RIPPLE

10 kHz TO 10 MHz

100

CURRENT

Tc = 55°C to +125°C

160

150

mA p-p

EFFICIENCY

LOAD FAULT

3, 4

POWER DISSIPATION

SHORT CIRCUIT

1.3

1.8

1.3

1.7

1.3

1.6

RECOVERY

STEP LOAD

50% - 100% - 50% BALANCED

RESPONSE

4, 5

TRANSIENT

±150

±300

±750

±300

±750

RECOVERY

100

200

500

1250

µs

STEP LINE RESP.

4, 5

TRANSIENT

16 TO 40 VDC

±750

±50

±125

±150

±375

40 TO 16 VDC

±500

±50

±125

±100

±250

mV pk

RECOVERY

16 TO 40 VDC

1200

150

375

250

625

40 TO 16 VDC

1200

400

1000

800

2000

µs

START-UP

DELAY

OVERSHOOT

500

120

150

mV pk

MODEL NUMBERING KEY

SMD NUMBERS

PIN OUT

MSA SERIES
5 WATT

DC/DC C

ONVERTERS

MSA 28 12 D / 883

Base Model

Input Voltage

Output Voltage

Number of Outputs

(S = single, D = dual)

(R = decimal point, 5R2 = 5.2 Vout)

Screening
(Standard screening has no designator
in this position.)

Pin

Single Output

Dual Output

Positive Output

Output Common

No connection

Negative Output

No connection

Inhibit

Positive Input

Input Common

Case Ground

TANDARD

ICROCIRCUIT

RAWING

(SMD)

5962-9309201HXC
IN PROCESS
5962-9309301HXC
5962-9309401HXC
5962-0052201HXC
5962-9308901HXC
5962-9309001HXC

MSA S

ERIES

IMILAR

ART

MSA2805S/883
MSA285R2S/883
MSA2812S/883
MSA2815S/883
MSA2860S/883
MSA2812D/883
MSA2815D/883

For exact specifications for an SMD product, refer to the SMD
drawing. Call your Interpoint representative for status on
MSA SMD releases. "883" suffix indicates SMD similar part.
SMDs can be downloaded from:
http://www.dscc.dla.mil/programs/smcr

BOTTOM VIEW

MSA

Squared corner and dot on top
of package indicate pin one.

IGURE

1: P

OTTOM

IEW

See page 7 for dimensions.

MSA SERIES

5 WATT

DC/DC C

ONVERTERS

Typical Performance Curves: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.

IGURE

OUTPUT POWER (Watts)

MSA2815D EFFICIENCY

(

)

40V

16V

28V

100

µs/div

16V TO 40V

MSA2805S STEP LINE RESPONSE

VIN

VOUT

OUTPUT POWER (Watts)

MSA2805S EFFICIENCY

(

)

40V

16V

28V

IGURE

OUTPUT POWER (Watts)

MSA2812S EFFICIENCY

(

)

40V

16V

28V

IGURE

FREQUENCY (kHz)

MSA SERIES AUDIO REJECTION

(

)

100

0.1

100

IGURE

OUTPUT POWER (Watts)

MSA2815S EFFICIENCY

(

)

40V

16V

28V

IGURE

200

µs/div

16V TO 40V

MSA2815D INPUT STEP LINE RESPONSE

VIN

+VOUT

VOUT

200

µs/div

10% 90%

MSA2815D +VO STEP LOAD RESPONSE

10% to 90%

90% to 10%

POUT=0.5W

100

µs/div

50% 100%

MSA2805S STEP LOAD RESPONSE

50% to 100%

100% to 50%

IGURE

100

µs/div

10% 100%

MSA2805S STEP LOAD RESPONSE

10% to 100%

100% to 10%

IGURE

100

µs/div

10% 50%)

MSA2815D +VO STEP LOAD RESPONSE

10% to 50%

50% to 10%

POUT=2.5W

IGURE

1 ms / div

MSA2805S TURN-ON INTO NO LOAD

VIN

VOUT

MSA SERIES
5 WATT

DC/DC C

ONVERTERS

Typical Performance Curves: 25°C Tc, 28 VDC Vin, 100% load, unless otherwise specified.

IGURE

OUTPUT POWER (Watts)

50 mV DROP

LOW LINE DROPOUT VS. LOAD

(

lts

)

MSA2805S

MSA2815S

MSA2812S

500

µs/div

MSA2815D TURN-ON INTO NO LOAD

VIN

+VOUT

VOUT

IGURE

OUTPUT LOAD (+VOUT % / VOUT %)

9010% LOAD on +V, 10-90% LOAD on V

MSA DUAL CROSS REGULATION

)

90/10

70/30

50/50

30/70

10/90

2815D

2812D

IGURE

OUTPUT POWER (Watts)

50 mV DROP

LOW LINE DROPOUT VS. LOAD

(

lts

)

MSA2812D

MSA2815D

IGURE

OUTPUT LOAD (%)

COND. A: 50% LOAD +V; 10% to 50% V
COND. B: 50% LOAD V; 10% to 50% +V

MSA DUAL CROSS REGULATION

(

)

2815D

2812D

COND B

COND A

MSA SERIES

5 WATT

DC/DC C

ONVERTERS

CASE C

BOTTOM VIEW

See Figure 20

for pin configurations.

1.075 max

(27.31)

Materials
Header Cold Rolled Steel/Nickel/Gold
Cover

Cold Rolled Steel/Nickel

Pins Copper/Nickel/Gold

compression glass seal

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

1.075 max

(27.31)

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.

Dot on top of case
indicates pin one

0.000

0.132

(3.35)

0.932

(23.67)

0.000

0.132 (3.35)

0.332 (8.43)

0.532 (13.51)

0.732 (18.59)

0.932 (23.67)

0.025

(0.64)

dia.

0.000

0.270 max.

(6.86)

MSA Series: Screening Standard, ES, or 883

BOTTOM VIEW CASE C1

0.205

0.010

(5.21

0.25)

0.000

0.270 max.

(6.86)

0.205

0.010

(5.21

0.25)

Projection Weld

Seam Seal

Squared corner and dot on
top of case indicate pin one.

IGURE

20: C

ASE

IGURE

19: C

ASE

C M

AXIMUM

IMENSIONS

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.

MSA SERIES
5 WATT

DC/DC C

ONVERTERS

TEST (125°C Products)

STANDARD

/ES

/883 (Class H)*

PRE-CAP INSPECTION

Method 2017, 2032

yes

TEMPERATURE CYCLE (10 times)

Method 1010, Cond. C, -65°C to 150°C

yes

Method 1010, Cond. B, -55°C to 125°C

yes

CONSTANT ACCELERATION

Method 2001, 3000 g

yes

Method 2001, 500 g

yes

BURN-IN

Method 1015, 160 hours at 125°C

yes

96 hours at 125°C case (typical)

yes

FINAL ELECTRICAL TEST MIL-PRF-38534, Group A

Subgroups 1 through 6: -55°C, +25°C, +125°C

yes

Subgroups 1 and 4: +25°C case

yes

HERMETICITY TESTING

Fine Leak, Method 1014, Cond. A

yes

Gross Leak, Method 1014, Cond. C

yes

Gross Leak, Dip (1 x 10

-3

)

yes

FINAL VISUAL INSPECTION

Method 2009

yes

Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.

*883 products are built with element evaluated components and are 100% tested and guaranteed over
the full military temperature range of 55°C to +125°C.

NVIRONMENTAL

CREENING

22021-001-DTS Rev C 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. MSA Series is a trademark of Interpoint.
Copyright © 1994 - 2001 Interpoint Corporation. All rights reserved.

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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