Gallium Nitride AC-DC converter boosts power and efficiency

July 26, 2019 //By Nick Flaherty
Gallium Nitride AC-DC converter boosts power and efficiency
Power Integrations has used a gallium nitride (GaN) switch in its latest offline AC-DC converter chips to get up to 95% efficiency across the full load range in 100 W adaptors without a heatsink.

The quasi-resonant InnoSwitch3-CP, InnoSwitch3-EP and InnoSwitch3-Pro AC-DC converter devices combine primary, secondary and feedback circuits in a single surface-mounted package. GaN switches replace the traditional silicon high-voltage transistors on the primary side, reducing conduction losses when current is flowing, and considerably reducing switching losses during operation. This increases efficiency and power delivery from the space-saving InSOP-24D package.

“GaN is a pivotal technology offering significant efficiency and size benefits over silicon," said Balu Balakrishnan, president and CEO of Power Integrations. "We anticipate a rapid conversion from silicon transistors to GaN in many power applications. InnoSwitch3 has been the clear technology leader in the offline switcher IC market since we launched the silicon variants 18 months ago, and the new GaN-based ICs further extend our lead by advancing both the efficiency and power capability of our flyback products.”

he AC-DC converter families target high-efficiency flyback designs such as USB-PD and high-current chargers/adapters for mobile devices, set-top boxes, displays, appliances, networking and gaming products. They provide accurate CV/CC/CP (contant voltage/constant current/constant power) independent of external components and easily interface to fast-charging protocol chips. The InnoSwitch3-CP and ‑EP variants are hardware-configurable, while the InnoSwitch3-Pro incorporates a digital interface for software control of CV and CC setpoints, exception handing and safety-mode options.

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

www.power.com

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