Zero-voltage switching power supply ICs help reduce size of power adapters

The InnoSwitch4-Pro family of digitally controllable flyback converter ICs enables manufacturers to substantially reduce the size of power adapters. Incorporating a robust PowiGaN gallium nitride (GaN) primary switch and performing steady-state switching at a frequency of up to 140 kHz, these highly integrated converter ICs reduce the component count and board area required for mains power adapters.

The InnoSwitch4-Pro ICs work with the Power Integrations ClampZero™ family of active clamp ICs to achieve zero-voltage switching (ZVS) in both continuous conduction mode (CCM) and discontinuous conduction mode (DCM). Alongside the efficient GaN switch, ZVS almost eliminates switching losses, enabling designers to eliminate the heat-sinks, spreaders and potting materials typically required for thermal management in compact power adapters.

Capable of supplying an output of up to 220 W, the InnoSwitch4-Pro ICs combine a 750 V PowiGaN primary switch, power controller, FluxLink™ reinforced isolation feedback link for secondary-side control, I2C interface, active clamp drive and synchronous rectification in a compact InSOP™-28 package. 

The high level of integration greatly simplifies the development and manufacturing of fully programmable, efficient power supplies for USB Power Delivery (PD) adapters, and adapters conforming to the Universal Fast Charging Specification (UFCS). 

InnoSwitch4-Pro flyback switcher ICs provide exceptionally accurate constant voltage/constant current outputs, independent of external components. They consume less than 30 mW when supplying no load, while offering line sensing and comprehensive protection features. 

The InnoSwitch4-Pro family is supported by various reference designs including RDR-942 for a USB PD 3.0 power adapter rated for up to 65 W, and DER-960 for a 100 W USB PD 3.0 adapter.