1250V GaN switcher IC is “groundbreaking” says Power Integrations 

Claimed to be the world’s high voltage, single switch GaN power supply IC, the InnoSwitch 3-EP 1250V IC is the latest member of Power Integrations’ samily of offline CV/CC QR flyback switcher ICs. 

The ICs offer synchronous rectification, FluxLink safety-isolated feedback and switch options including 725V silicon, 1700V SiC and PowiGaN in 750V, 900V and the latest 1250V model. 

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

The company said it was first to market with high volume shipments of GaN-based power supply ICs and is now advancing high voltage GaN technology and commercial deployment “rendering even the best high-voltage silicon MOSFETs obsolete along the way,” said Radu Barsan, vice president of technology at Power Integrations.

The 1250V devices, which follow the introduction of 900V versions of the GaN-based InnoSwitch earlier this year, “extend the efficiency benefits of GaN to an even wider range of applications, including many currently served by silicon-carbide technology,” continued Barsan. 

Designers using the new InnoSwitch3-EP 1250V ICs can confidently specify an operating peak voltage of 1000V, which allows for industry standard 80 per cent de-rating from the 1250V absolute maximum, confirmed the company. This provides significant headroom for industrial applications and is useful in power grid environments where robustness can protect against grid instability, surge and other power perturbations.

Samples of the 1250V InnoSwitch3-EP ICs are available now with volume shipment lead time of 16 weeks. 

A reference design, DER-1025, describing a 12V, 6A flyback converter is available for free download. 

The ICs are available via Power Integrations sales representatives or one of the company’s authorised worldwide distributors: DigiKey, Newark, Mouser and RS Components. 


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