Gallium Nitride-Based InnoSwitch3 AC-DC Converter ICs


ByAbhiemanyu Pandit 0

Gallium Nitride-Based InnoSwitch3 AC-DC Converter ICs

Power Integrations launched new members of its InnoSwitch™3 families of offline CV/CC flyback switcher ICs features up to 95% efficiency across the full load range and up to 100 W in enclosed adapter implementations without requiring a heatsink. The increase in performance is achieved with the help of an internally developed high-voltage GaN switch technology. Newly released Quasi-resonant InnoSwitch3-CP, InnoSwitch3-EP and InnoSwitch3-Pro ICs integrate primary, secondary and feedback circuits in a single surface-mounted package and the GaN switches replace the traditional silicon high-voltage transistors on the primary side of the IC. This reduces conduction losses when current is flowing, and considerably reducing switching losses during operation which results in substantially less wasted energy increasing efficiency and power delivery from the space-saving InSOP-24D package.


The InnoSwitch3 AC-DC Converter ICs provide accurate CV/CC/CP independent of external components, and easily interface to fast-charging protocol ICs and targets the flyback designs, such as USB-PD and high-current chargers/adapters for mobile devices, displays, appliances, set-top boxes, networking and gaming products. Also, the InnoSwitch3-CP and ‑EP variants are hardware-configurable, while the InnoSwitch3-Pro incorporates a sophisticated digital interface for software control of CV and CC setpoints, exception handing and safety-mode options.


Notable Features of InnoSwitch3 AC-DC Converter ICs Include:

  • Small size InSOP-24D package
  • 95% efficiency across the full load range
  • Leverages high-voltage GaN switch technology
  • Reduces Switching losses
  • Easily interfaced to fast-charging protocol ICs


New InnoSwitch 3 ICs are priced at $4/unit in 10,000-piece quantities and are available from Power Integrations. Also, five new reference designs describing USB-PD chargers from 60 W to 100 W along with an automated PI Expert, design tool, and other technical support documentation are available on the Power Integrations website.

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