28Vin space-grade PSUs are radiation-tolerant and customisable

Why discrete components and not hybrid construction?

“They are easier to customize than alternative space-grade power converters so they can meet specific voltage, current and other needs,” said Microchip v-p of discrete products Leon Gross.

Custom versions are available “with reasonable lead time and modest NRE cost,” said Microchip.

The isolated magnetic-feedback 220kHz forward-converter is the 50W-rated SA50-28. Calculated MTBF is eight million hours.

Inputs can span 20 to 40V and there are five different single-output models, offering outputs of 3.3, 5, 12, 15 or 28V. There are also four triple versions with +3.3V or +5V, and dual 12V or dual 15V.  The dual outputs are isolated, allowing them to be mixed and matched into ± pairs or higher voltages.

Size is ~78 x 52 x 12mm plus pins, and there is a choice of top-pin or side-pin packages.

Full power is available across -55 to +85°C, derating linearly above that to zero at +125°C.

Features include output inhibit control, input under-voltage lock-out, over-current protection and external synchronisation.

An external filter is required to achieve MIL-STD-461 EMI compliance – Microchip offers its SF200-28-28S for this, and at least some of the Microsemi-branded versions of the data sheet include a discrete design.

Radiation hardened options go up to 100kRad (Si) total ionizing dose and > 80MeV.cm2/mg single event effect rating for space and military applications, then prototype-grade units are available, as well as non-radiation-tolerant engineering units.

The dc-dc converters are designed and manufactured in the US, and require an approved export license prior to leave the US as they are subject to ITAR (International Traffic in Arms Regulations).

3.3V version data sheet

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