MODELS

VDC O

UTPUT

B2-53

Size (max.): 3.200 x 2.600 x 0.460 inches (81.28 x 66.04 x 11.68 mm)

See Section B8, case N, for dimensions.

Weight:

120 grams typical

Screening: Standard or ES. See Section C2 for screening options,

see Section A5 for ordering information.

EATURES

· 55°C to +125° C operation
· 16 TO 40 VDC input
· Four fully regulated outputs
· Internal EMI filter meets

MIL-STD-461C CE03

· Active transient suppressor
· Built in hold-up function with flag
· Fully isolated
· Magnetic feedback
· Fixed frequency, 550 kHz typical
· Topology Single Ended Forward
· Inhibit function
· Indefinite short circuit protection
· Undervoltage lockout

QUAD

±5 and ±12
±5 and ±15

DESCRIPTION

The MQO SeriesTM of DC/DC converters supply up to 16.5 watts in
a four output configuration of ±5 and ±12 or ±5 and ±15 VDC. An
integral EMI filter and transient suppressor allow the converters to
meet MIL-STD-461C standards without external components. An
output hold-up feature provides a low power flag and full output
power hold-up through transient dropout conditions.

The MQO Series converters are packaged in hermetically sealed
cases and are rated for full power operation from 55° to +125° C
case temperature. This makes these units ideal for military, aero-
space, and hi-rel industrial applications.

A high gain bandwidth magnetically isolated control loop is used to
precisely regulate the +5 VDC output. Constant frequency pulse
width with a single ended forward topology is used. The 5 VDC
output and the auxiliary outputs are independently controlled with
low headroom regulators, eliminating cross regulation errors. The
use of feedforward, compensation, and a high gain bandwidth
control loop provides excellent rejection to the conducted audio
spectrum of MIL-STD-704A-D and MIL-STD-461C.

NTEGRAL

EMI F

ILTER

The MQO Series includes a a built-in EMI filter and transient
suppressor which allow the units to meet the most common military
standards without any external components. The internal EMI filter
provides both differential and common mode attenuation on the

input power lines to allow meeting the CE03 interference and CS02
susceptibility requirements. The active internal transient suppressor
provides protection against MIL-STD-704A, 1275, and 461C line
transients. Protection is provided for transients up to 400 V from a
0.5 ohm source and 600 V from a 50 ohm source.

UILT

-I

OLD

-U

UNCTION WITH

LAG

An output hold-up feature provides a low power flag and full output
power hold-up through transient drop out conditions. At full load for
a Vin step from 28 to 0 volts, the minimum hold-up time will be 50
µs. The low power flag (TTL high) is asserted 10 µs before the end
of the hold-up time. External capacitance can be added to extend
hold-up time.

HORT

IRCUIT

ROTECTION

MQO Series converters provide predictable current limiters which
directly sense output load current in the converter's secondary.
During short circuit or overload conditions, the current limiters
provide constant output current and an input power fold-back.

NDERVOLTAGE

OCKOUT

Undervoltage lockout prevents the converters from operating below
approximately 12 VDC input voltage which helps keep system
current levels smooth, especially during initialization or re-start oper-
ations.

DC/DC C

ONVERTERS

28 V

OLT

NPUT

MQO SERIES

16 WATT

INHIBIT

TYPICAL CHARACTERISTICS

RECOMMENDED OPERATING CONDITIONS

ABSOLUTE MAXIMUM RATINGS

Input Voltage

· 16 to 40 V

Output Power

· 16.75 watts

Lead Soldering Temperature (10 sec per lead)

· 300°C

Storage Temperature Range (Case)

· 65°C to +150°C

B2-54

MQO SERIES
16 WATT

DC/DC C

ONVERTERS

Undervoltage Lockout

· 12 V input typical

Isolation

· 100 megohm minimum at 500 V

Audio Rejection

· Up to 50 dB

Conversion Frequency

· 550 kHz typical

Input Voltage Range

· 16 to 40 VDC continuous

Case Operating Temperature (Tc)

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

Derating Output Power/Current

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

Inhibit TTL Open Collector

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

Open collector

MQO28512Q

MQO28515Q

PARAMETER

CONDITION

MIN TYP MAX

MIN

TYP

MAX

UNITS

OUTPUT VOLTAGE

4.95

5.00

5.05

4.95

5.00

5.05

4.95

5.00

5.05

4.95

5.00

5.05

+ AUX.

11.90

12.00

12.10

14.90

15.00

15.10

VDC

AUX.

11.90

12.00

12.10

14.90

15.00

15.10

OUTPUT CURRENT

390

2000

390

2000

350

+ AUX.

208

167

AUX.

208

167

OUTPUT POWER

1.95

10.00

1.95

10.00

= 16 TO 40 VDC

1.75

+ AUX.

2.50

AUX.

2.50

OUTPUT RIPPLE

10 kHz to 2 MHz

+ AUX.

mV p-p

AUX.

LINE REGULATION

= 16 TO 36 VDC

5, ±AUX.

LOAD REGULATION

MINIMUM LOAD TO FULL ±5

120

± AUX.

220 --

220

INPUT VOLTAGE

MINIMUM LOAD TO FULL

Tc = 55° TO +125° C

CONTINUOUS

VDC

TRANSIENT 50 ms

0.5 OHM SOURCE

400

50 OHM SOURCE

600

INPUT CURRENT

MINIMUM LOAD

230

FULL LOAD

960

INHIBITED

INPUT RIPPLE --

mA p-p

EFFICIENCY

10 kHz TO 2 MHz

START-UP

DELAY

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

MODEL NUMBERING KEY

PIN OUT

B2-56

MQO SERIES
16 WATT

DC/DC C

ONVERTERS

Pin

Designation

Inhibit

Positive Input

Input Common

Positive 5 V Output

Output Common

Negative 5 V Output

Low Power Flag

Positive Aux.Output

Output Common

Negative Aux. Output

Hold-up Common

Positive Hold-up Input

Case Ground

BOTTOM VIEW

MQO

IGURE

2: P

MQO 28 512 Q / ES

Base Model

Input Voltage

Output Voltage

Number of Outputs

(Q = quad)

(Main and aux. Vout)

Screening

(Standard screening has no designator
in this position.)

See Section B8, case N, for dimensions

23624-001-DTS Rev A

DQ# 3003

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. MQO Series is a trademark of Interpoint.
Copyright © 1991 - 1999 Interpoint. All rights reserved.

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