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Power Integrations introduces offline flyback switcher


Zero-voltage switching topology and SR FET control enable 95 percent efficiency

Power Integrations has announced the release of the InnoSwitch5-Pro family of high-efficiency, programmable flyback switcher ICs, designed for compact, highly efficient single- or multi-port USB PD adapters.

The single-chip switcher is said to achieve over 95 percent efficiency with a novel secondary-side control scheme which achieves zero-voltage switching (ZVS) without a dedicated and costly additional high voltage switch. The new IC features a 750V or a 900V PowiGaN primary switch, primary-side controller, FluxLink isolated feedback and secondary controller with an I2C interface.

Adnaan Lokhandwala, senior product marketing manager at Power Integrations said: "The combination of ZVS and GaN is power supply magic. Switching losses vanish, and we can leverage the low conduction losses of GaN to implement super dense adapter layouts with far fewer components than asymmetric half-bridge (AHB) circuits or active clamp alternatives. For example, we have demonstrated 140 W / 28 V USB PD adapters in 4.2 cubic inches using only 106 components. The flyback topology used by InnoSwitch5-Pro ICs is much easier to implement than AHB and can also operate from universal mains with or without a PFC stage.”

InnoSwitch5-Pro flyback switcher ICs feature lossless input line voltage sensing on the secondary side for adaptive DCM/CCM and ZVS control to maximise efficiency and simplify design across line and load. The ICs also feature a post-production tolerance offset to facilitate accurate output constant-current (CC) control of better than two percent to support the UFCS protocol. Excellent efficiency – better than 95 percent – allows designers to eliminate heat sinks, spreaders and potting materials for thermal management, further reducing size, weight, component cost and manufacturing complexity.

Key markets for the InnoSwitch5-Pro family of flyback switcher ICs include high-density USB PD 3.1 Extended Power Range (EPR), UFCS and multi-protocol adapters, notebook adapters and after-market single- and multi-port chargers and adapters.

Pricing for InnoSwitch5-Pro devices starts at $2.40 for 10,000-unit quantities.

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