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PI releases HV single-switch power supply IC


Company adds 1250V GaN power supply chip to InnoSwitch family

Power Integrations has released a high-voltage, single-switch GaN power supply IC, featuring a 1250V PowiGaN switch.

InnoSwitch3-EP 1250 V ICs are the newest members of Power Integrations’ InnoSwitch family of off-line CV/CC QR flyback switcher ICs, which feature synchronous rectification, FluxLink safety-isolated feedback and an array of switch options: 725 V silicon, 1700V SiC, and PowiGaN in 750V, 900V and now 1250V varieties.

The switching losses for Power Integrations’ proprietary 1250 V PowiGaN technology are said be than a third of that seen in equivalent silicon devices at the same voltage. This results in power conversion efficiency as high as 93 percent – enabling highly compact flyback power supplies that can deliver up to 85 W without a heatsink.

The company says designers using the new InnoSwitch3-EP 1250 V ICs can specify an operating peak voltage of 1000V, which allows for industry-standard 80 percent de-rating from the 1250 V absolute maximum. This provides significant headroom for industrial applications and is particularly valuable in challenging power grid environments where robustness is an essential defense against grid instability, surge and other power perturbations.

Samples are available now; volume-shipment lead time for 1250 V InnoSwitch3-EP ICs is 16 weeks. Pricing for InnoSwitch3-EP 1250 V devices in the INSOP-24D package starts at $3.00 for 10,000-unit quantities. A reference design, DER-1025, describing a 12 V, 6 A flyback converter is available for free download.

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