15W radiation-rated dc-dc for space

Microchip has introduced a 15W radiation-rated dc-dc converter for space use.

Intended to be fed from a satallite’s 28V bus (22V to 42V, 50V abs max), SA15-5-5T has three isolated 5V 1A outputs that can be paralleled for more current or connected in series for higher voltages.

Output ripple is <1%, and operation is over-55 to 125°C, with de-rating above 85°C to zero at 125°C

Radiation specs are >100krad (Si) and 30krad (Si) ELDRS (<10mrad/s) per MIL-STD-883 Method 1019, and SEE immunity to 82MeVcm²/mg.

Approximate dimensions are 57 x 44 (plus feet) x 12mm, and 55g.

MTBF is estimated at ~40 million hours.

Physically, abs max shock is 1,500g peak (0.5ms, half sine), maximum constant acceleration is 50g and random vibration (50Hz to 2kHz) is 24.06grms.

A matching EMI filter is available – SF100-28 can filter the input of multiple power supplies up to a load of 6A in total.

Custom output voltage combinations are available. “The non-hybrid or discrete component-based construction is specifically designed to enable flexibility,”said Microchip high-rel v-p Leon Gross.

Supporting material includes worst-case, electrical stress and reliability analysis.

Find Microchip’s SA15-28-5-5T dc-dc converter here and the filter on this web page

Last year, EPC reveled an 200V 50A dc-dc converter design for space using GaN transistors

In this article, ‘g’ is gravity rather than grams.