Switcher IC for 110W charger designs

Switcher IC for 110W charger designs

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By Nick Flaherty

Power Integrations has launched its latest high frequency, zero voltage switching (ZVS) flyback switcher chips with a charger design partnership with Anker

The InnoSwitch4-CZ family of InnoSwitch4-CZ devices incorporate a 750 V primary switch using Power Integrations’ PowiGaN technology and a novel high frequency active clamp flyback controller. This enables smaller chargers for phones, tablets and laptops up to 110W, with the first charger launched today by Anker.

The switcher includes primary and secondary controllers, ClampZero interface, synchronous rectification, and safety-rated feedback in a single, compact InSOP-24D package. A steady state switching frequency of up to 140 kHz reduces the transformer size.

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In contrast with older active clamp flyback approaches, the InnoSwitch4-CZ and ClampZero combination provides up to 95 percent efficiency and maintains very high efficiency across variations in line voltage, system load and output voltage. This is achieved with variable frequency asymmetrical control of the active clamp with intelligent zero-voltage switching, enabling both discontinuous and continuous conduction modes of operation, greatly enhancing design flexibility and maximizing efficiency across the entire operating envelope. 

The flyback switcher has a high level of CV/CC accuracy, independent of external components, and consumes less than 30 mW no-load including line-sensing safety and protection features.

The device is aimed at USB PD adapters up to 110 W and high-efficiency CV/CC power supplies. TH3e chargers are fully protected featuring auto-restart or latching fault response for output over-voltage and under-voltage protection, multiple output under-voltage fault thresholds and latching or hysteretic primary over-temperature protection.

“The introduction of the InnoSwitch4-CZ family of ICs marks a significant milestone for GaN technology. PowiGaN switches, in conjunction with our active clamp solution – ClampZero, enable a highly efficient design and an extremely compact form-factor. We’re pleased to have worked closely with the Anker team to bring this new class of mobile charger to market,” said Balu Balakrishnan, CEO of Power Integrations.

Steven Yang, CEO at Anker added: “We are excited to work with Power Integrations as their exclusive launch partners for their InnoSwitch4 chipsets. The InnoSwitch4-CZ was a natural choice for Anker’s new Nano II series of USB-C chargers. Its outstanding levels of integration and efficiency are key to the Nano II series’ extremely compact design.”

A technical overview video of the InnoSwitch4-CZ and ClampZero devices is available here. The InnoSwitch4-CZ ICs are priced at $3.85 per unit in 10,000-unit quantities. 

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