09/08/06

www.irf.com

1

HYBRID - HIGH RELIABILITY

RADIATION TOLERANT

DC/DC CONVERTER

M3L-SERIES

Description

n Total Dose > 25K Rad(Si)

n Internal EMI filter; Converter Capable of

meeting MIL-STD-461C CE03 and CS01

n Low Weight, < 85 grams

n Magnetically Coupled Feedback

n 16V to 50V DC Input Range

n Up to 25W Output Power

n Single and Dual Output Models Include

3.3, 5, 12, 15,

n High Efficiency to 82%

n -55°C to +125°C Operating Temperature Range

n Under-Voltage Lockout

n Short Circuit and Overload Protection

n Output Over Voltage Limiter

n Adjustable Output Voltage

n External Inhibit

n 1,500,000 Hour MTBF

Features

+ 28V Input, Single/Dual Output

The M3L-Series of DC/DC converters are radiation

tolerant, high reliability devices designed for moderate

radiation environments such as those encountered by

low earth orbit satellites and launch vehicles. For higher

radiation environments, the M3G-Series of DC/DC

converters is recommended. Features include small size,

low weight and a high tolerance to total ionizing dose,

single event effects and environmental stresses such

as temperature extremes, mechanical shock, and

vibration. All components are fully derated to meet the

requirements of MIL-STD-975 and MIL-STD-1547 and

GSFC PPL-21 Appendix B. Extensive documentation

including Radiation Susceptibility, Thermal Analysis,

Stress Analysis and MTBF are available.

The converters incorporate a fixed frequency single

forward topology with magnetic feedback and an internal

EMI filter. These converters are capable of meeting the

conducted emissions and conducted susceptibility

requirements of MIL-STD-461C without any additional

components. All models include an external inhibit port

and have an adjustable output voltage. They are

enclosed in a hermetic 1.5" x 2.3" x 0.425" steel package

and weigh less than 85 grams. The package utilizes

rugged ceramic feed-through copper core pins and is

sealed using parallel seam welding.

Manufactured in a facility fully qualified to MIL-PRF-

38534, these converters are fabricated utilizing DSCC

qualified processes. For available screening options,

refer to device screening table in the data sheet.

Non-flight versions of the M3L-Series converters are

available for system development purposes. Variations

in electrical specifications and screening to meet custom

requirements can be accommodated. Consult IR Santa

Clara for special requirements.

Applications

n Low Earth Orbit Satellites (LEO)

n Launch Vehicles

M3L

PD-94519B