Wide-creepage switcher improves vehicle safety

A wide-creepage package option for Power Integrations’ InnoSwitch 3-AQ flyback switcher IC enhances safety and reliability in automotive applications. According to the company, the increased primary-to-primary creepage and clearance distance of 5.1 mm between the drain and source pins of the InSOP-28G package eliminates the need for conformal coating, making the IC compliant with the IEC 60664-1 reinforced isolation standard in 800-V vehicles.

The new 1700-V CV/CC InnoSwitch3-AQ devices feature an integrated SiC primary switch delivering up to 80 W of output power. They also include a multimode QR/CCM flyback controller, secondary-side sensing, and a FluxLink safety-rated feedback mechanism. This high level of integration reduces component count by half, simplifying power supply implementation. The wider drain pin enhances durability, making the ICs well-suited for high-shock and vibration environments, such as eAxle drive units.

These latest members of the InnoSwitch3-AQ family start up with as little as 30 V on the drain without external circuitry, critical for functional safety. Devices achieve greater than 90% efficiency and consume less than 15 mW at no-load. Target automotive applications include battery management systems, µDC/DC converters, control circuits, and emergency power supplies in the main traction inverter.

Prices for the 1700 V-rated InnoSwitch3-AQ switching power supply ICs start at $6 each in lots of 10,000 units. Samples are available now, with full production in 1Q 2025.

InnoSwitch3-AQ product page

Power Integrations 

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