Power_electronics Features

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Power Electronics Europe News
Integration and digital control reduce component count for adapters,
The InnoSwitch 4-Pro family of digitally controllable, off-line CV/CC zero voltage switching (ZVS) flyback ICs incorporate a PowiGaN GaN primary switch and steady-state switching frequency of up to 140kHz. The integrated devices reduce the component count and PCB area required for adapters for cellphone, notebook, tablet and multi-port accessories, says the company.

They are designed to interface with the company’s ClampZero family of active clamp ICs to achieve ZVS in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). According to Aditya Kulkarni, product marketing manager at Power Integrations: “ZVS, combined with . . . PowiGaN technology, virtually eliminates switching losses. Efficiency exceeds 95%, which enables designers to eliminate the heat sinks, spreaders and potting materials typically required for thermal management,” he said.

An adapter can be further reduced in size with the use of a MinE-CAP device combined with InnoSwitch4-Pro and ClampZero ICs. Based also on PowiGaN technology, MinE-CAP ICs enable input capacitance size reduction of approximately 40%.

The InnoSwitch4-Pro ICs combine a 750V PowiGaN primary switch, controller, FluxLink reinforced isolation feedback link for secondary-side control, I2C interface, active clamp drive and synchronous rectification and are capable of delivering up to 220W in a compact InSOP-28 package. In combination with ClampZero and MinE-CAP companion devices they enable compact and slim form factors for OEM accessory and aftermarket USB PD and Universal Fast Charging Specification (UFCS) adapters.  

A unique control algorithm enables ZVS in both DCM and CCM. When paired with the ClampZero IC, the algorithm allows for higher frequency operation without a corresponding drop in efficiency. InnoSwitch4-Pro also supports quasi-resonant switching in DCM and CCM when used as a standalone product. DCM-only operation can be selected to reduce SR FET voltage stress. The ICs also feature an optimised command set to reduce I2C traffic.

They deliver CV/CC accuracy, independent of external components, says PI, and consume less than 30mW no-load. They also have line-sensing and protection features, for example auto-restart or latching fault response for output over-voltage and under-voltage protection, multiple output under-voltage fault thresholds, latching or hysteretic primary over-temperature protection and output bus switch short-circuit protection.

There are also two reference designs, DER-960 (100W), RDK-942 (65W) available for the InnoSwitch4-Pro IC. The ICs are available from the company’s authorised worldwide distributors: Digi-Key, Farnell, Mouser and RS Components, or directly from the company.  

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