InnoSwitch3-AQ flyback switcher ICs for EVs

5th May 2021
Alex Lynn

Power Integrations has announced that its automotive-qualified InnoSwitch3-AQ flyback switcher IC family is now available with a member rated to 900V, providing greater headroom for 400V and 800V electric vehicle inverter, battery management and climate control applications.

The InnoSwitch3-AQ family combines primary and secondary controllers plus safety-rated feedback circuitry into a single IC. This allows accurate output voltage regulation, low component count and configuration options for operation over the ultra-wide input voltage range of 30V to 1,200V.

Edward Ong, Senior Product Marketing Manager at Power Integrations said: “New 400V system designs for electric vehicles require higher operating voltages to account for fault conditions and transients. The new 900V INN3996CQ ICs provide plenty of voltage headroom and meet the Automotive Electronics Council strict requirements for qualification ensuring safe and reliable operation in the demanding automotive application. Using a StackFET approach, the new device is suitable for 900V and greater bus designs.”

The constant voltage (CV) regulated AEC-Q100-qualified InnoSwitch3-AQ switcher ICs achieve up to 90% efficiency across the load range and consume less than 15 mW under no-load conditions. Output power is up to 20 W at 85 °C ambient temperature and 400 VDC input for the 900V family.

Devices incorporate a multi-mode Quasi-Resonant (QR) / CCM / DCM flyback controller, 900V switch, and Power Integrations’ high speed FluxLink communications link that enables accurate regulation in the compact InSOP24 package and provides reinforced isolation up to 5,500m altitude. InnoSwitch3-AQ ICs operate down to 30VDC, enabling automotive designers to use the device in traction inverter emergency power supply applications.

InnoSwitch3-AQ family devices include multiple protection features for automotive applications including input over-voltage and under-voltage protection, output over-voltage and over-current limiting, and over-temperature shutdown.

A new design reference, DER-889Q, is available that describes a 15W power supply that supports 30 VDC to 1200 VDC input and 12V / 1.25A output. Another resource, the 30 VDC to 921 VDC DER-859Q describes the operation of InnoSwitch3-AQ in 800V bus applications delivering up to 30W. Both designs employ PI’s StackFET technology. The additional circuitry may be omitted for 400 VDC designs. The new InnoSwitch3-AQ INN3996CQ ICs are priced at $2 in volume product quantities.

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