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ARH28XXS Series

28V Input, Single Output

Radiation Performance

The radiation tolerance characteristics inherent in the

ARH28XXS converters are a result of a carefully planned

ground-up design program with specific radiation design

goals. Identification of the general circuit topology, a

fundamental task in the design effort, was followed by

selection of appropriate elements from a list of devices for

which extensive radiation effects data was available. By

imposing sufficiently large margins on those electrical

parameters showing the worst case degrading effects of

radiation, designers were able to select appropriate

elements for incorporation into the circuit. Existing radiation

data was utilized for input to PSPICE and RadSPICE in the

generation of circuit performance verification analyses.

Thus, electrical performance capability under all

environmental conditions including radiation was well

understood before first application of power to the inputs.

The following table specifies guaranteed minimum radiation

exposure levels tolerated while maintaining specification

limits.

A principal design goal was achieving a converter topology

that, because of large design margins, had radiation

performance essentially independent of radiation induced

element-lot performance variations. Where such margins

cannot be assured, element lots are either selected

following RLAT characterization as radiation hard devices

or, purchased as radiation hard devices so that realization

of the design goals are maintained.

.

Radiation Specification Tcase = 25°C

International Rectifier currently does not have a DLA Land and Maritime certified Radiation Hardness

Assurance Program.

* Group B quantity for option 2 End of Line QCI. No Group B samples required for Option 1, In-line.

Standard Quality Conformance Inspections on ARH28XXS Series (Filght Screened)

Inspection

Application

Samples

Group A

Part of screening on each unit

100%

Group B

Each inspection lot

* 5 units

Group C

First inspection lot or following Class 1 change

10 units

Group D

In line (Part of element evaluation)

3 units

Test

Conditions

Min

Typ

Unit

MIL-STD-883, Method 1019.4

Total Ionizing Dose (2.:1 Margin) Operating bias applied during exposure

100

Krads(Si)

Dose Rate

MIL-STD-883, Method 1021

Temporary Saturation

1E8

Rads(Si)/sec

Survival

1E11

Heavy Ions

BNL Dual Van de Graf Generator

(Single Event Effects)

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