APEC: Power integrations adds 900V GaN fly-back dc-dc converters

Power Integrations is aiming at industrial and automotive power supplies up to 100W, by building 900V GaN transistors into its InnoSwitch3 fly-back switcher family – something it announced at APEC in Florida.

Previously 750V was the highest rating amongst the GaN members of this family.

There are two product lines now with 900V gallium nitride options:

The AEC-Q100-qualified InnoSwitch3-AQ family is suited to 400V bus electric vehicles “where the 900V switch provides more power and increased design margin – required for 12V battery-replacement systems”, according to the company.

900V versions of the industrial InnoSwitch3-EP family are pin-for-pin compatible with existing 725 and 750V ..-EP parts “and offer increased safety margin, which is ideal for countries with unstable line voltages”, it said.

The parts are constant voltage and constant current fly-back switcher ICs with synchronous rectification. Valley switching discontinuous or continuous conduction modes are available.

For accurate regulation without opto-isolators, the IC has separate isolated die inside linked by an inductive coupler.

Up to 100W of output is available with an input of 230Vac ±15% without heat sinks, and better than 93% peak efficiency can be delivers, said the company. The ..-AQ parts can delover 100W from 400Vdc – the company also makes similar devices with a 1.7kV silicon carbide switch for 800V vehicles.