Flyback switcher ICs support electric vehicle designs

May 05, 2021 // By Jean-Pierre Joosting
Flyback switcher ICs support electric vehicle designs
InnoSwitch3-AQ flyback switcher ICs are up to 90% efficient with low 15 mW no-load power consumption and increased voltage margin for 400 V and 800 V batteries.

Power Integrations has announced that its automotive-qualified InnoSwitch3™-AQ flyback switcher IC family is now available with a member rated to 900 V, providing greater headroom for 400 V and 800 V electric vehicle inverter, battery management and climate control applications. The flyback switcher 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 30 V to 1200 V.

Edward Ong, Senior Product Marketing Manager at Power Integrations said: “New 400 V system designs for electric vehicles require higher operating voltages to account for fault conditions and transients. The new 900 V 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 900 V and greater bus designs.”

The constant voltage (CV) regulated AEC-Q100-qualified InnoSwitch3-AQ flyback 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 900 V family. Devices incorporate a multi-mode Quasi-Resonant (QR) / CCM / DCM flyback controller, 900 V switch, and Power Integrations’ high speed FluxLink communications link that enables accurate regulation in the compact InSOP24 package and provides reinforced isolation up to 5500 m altitude. InnoSwitch3-AQ ICs operate down to 30 VDC, enabling automotive designers to use the device in traction inverter emergency power supply applications.


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