Zero-voltage switching flyback switcher for power electronics applications introduced by Power Integrations

June 22, 2021
Devices are protected with auto-restart or latching fault response for output over-voltage and under-voltage and output under-voltage fault thresholds.

SAN JOSE, Calif. – Power Integrations Inc. in San Jose, Calif., is introducing the InnoSwitch4-CZ family of high-frequency zero-voltage switching (ZVS) flyback switcher integrated circuits (ICs) for ultra-compact power chargers suitable for phones, tablets, and laptop computers.

Targeting high-efficiency compact USB PD adapters, high-density flyback designs of as much as 110 Watts, and high-efficiency CV/CC power supplies, InnoSwitch4-CZ ICs provide variable-output voltage and constant-current profiles.

Devices are protected featuring auto-restart or latching fault response for output over-voltage and under-voltage protection, multiple output under-voltage fault thresholds and latching or hysteretic primary over-temperature protection.

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InnoSwitch4-CZ zero-voltage switching (ZVS) flyback switcher incorporate a 750-volt primary switch using the company's PowiGaN technology and a high frequency active clamp flyback controller.

The InnoSwitch4-CZ family incorporates 750-volt switch, primary and secondary controllers, ClampZero interface, synchronous rectification, and safety-rated feedback in a compact InSOP-24D package.

A steady state switching frequency to 140 kHz minimizes transformer size and increases power density.

Power electronics pursue goals in SWaP and efficiency

In contrast with older active clamp flyback approaches, the InnoSwitch4-CZ and ClampZero combination provides as much as 95 percent efficiency and maintains high efficiency across variations in line voltage, system load, and output voltage.

This comes from variable frequency asymmetrical control of the active clamp with intelligent zero-voltage switching, enabling discontinuous and continuous conduction modes of operation. The flyback switcher ICs enable exceptional CV/CC accuracy, independent of external components, and consume less than 30 milliwatts no-load including line-sensing safety and protection features.

For more information contact Power Integrations online at

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