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Power Electronics Europe News
PIís latest GaN switch reduces size of USB PD 3.1 adapters
The high frequency, zero voltage switching (ZVS) flyback controller IC can be paired with the company’s ClampZero active-clamp IC and, optionally, the HiperPFS-5 GaN-based power factor corrector. The ICs target USB PD 3.1 designs meeting its specification for adapters and chargers up to 220W.

Designers can use it to develop chargers or adapters which exceed 23W per cubic inch for single and multiple-output USB PD 3.1 certified designs. According to Edward Ong, senior product marketing manager at Power Integrations: “The maximum switching frequency of up to 140kHz minimises transformer size, and the high level of integration approximately halves the number of passive components, MOSFETs and diodes that make safety-compliant PCB layout a challenge”.

The InnoSwitch4-CZ ICs include a 750V PowiGaN primary switch, active clamp drive and synchronous rectification in a compact InSOP-24D package. Secondary-side sensing – achieved using Power Integrations’ FluxLink high speed communications technology – provides CV/CC accuracy.

A non-complementary-mode active clamp enables designs that work in both continuous (CCM) and discontinuous (DCM) modes to support the wide load/range conditions often encountered in USB PD applications.

The ICs consume less than 30mW at no-load, including input line voltage monitoring. Protection features include auto-restart or latching fault response for output over- and under-voltage. multiple output under-voltage fault thresholds and latching or hysteretic primary over-temperature protection.

A compact 130W, USB PD adapter reference design is also available, the DER-957. This allows designers to evaluate the InnoSwitch4-CZ flyback controller IC and ClampZero active clamp IC chipset.

The ICs are available now directly from the company or one of its authorised distributors, i.e., Digi-Key, Farnell, Mouser and RS Components.

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