Flyback switcher extends to 1200V

May 05, 2021 // By Nick Flaherty
Flyback switcher extends to 1200V for EV chargers
The InnoSwitch3-AQ flyback switcher now covers 800V and 1000V automotive battery packs with 90 percent efficiency and 15 mW no-load power consumption

Power Integrations has extended its InnoSwitch flyback switcher family to support 800V automotive battery packs. This allows a single device, or the switcher with a discrete FET, to provide power from 30V all the way up to 1200V for emergency power and safety systems.

The InnoSwitch3-AQ flyback switcher is now rated to 900 V, providing greater headroom for 400 V and 800 V 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 chip. This enables accurate output voltage regulation, low component count and configuration options for operation over the ultra-wide input voltage range of 30 V to 1200V with a separate discrete StackFET.

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

The constant voltage (CV) regulated AEC-Q100-qualified InnoSwitch3-AQ switcher ICs achieve up to 90 percent 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.

The chip integrates a multi-mode Quasi-Resonant (QR) / CCM / DCM flyback controller, 900 V switch, and Power Integrations’ 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.

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

The InnoSwitch3-AQ INN3996CQ is priced at $2 in volume product quantities.

www.power.com

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