WIW1101 is based on a 32bit MCU, said the company, and is specifically for totem pole PFCs operating in critical conduction mode (CrCM), switching at up to 2MHz and delivering between 100W and 1.5kW.
Its proprietary internal algorithm “enables ZVS [zero voltage switching] across all power transistors while maintaining >98% efficiency” according to Wise.
The control IC implements over-current, over-voltage, over-power and over-temperature protection, as well as in-rush management.
Standby power can be as low as 18mW.
There is no public data sheet yet (Electronics Weekly has requested one), but there is an evaluation board (photo right) which implements a full-bridge PFC (sometimes referred to as ‘bridge-less’ PFC).
The chip controls two of the company’s own 60mΩ WI71060A GaN HEMTs on the fast side (see diagram), two silicon mosfets on the slow side, and a third silicon mosfet for in-rush control – switching the 0V side of the output reservoir capacitor.
Its specs are 90-264Vac on the input, and 400Vdc on the output, at 98% efficiency.
Applications are foreseen in server PSUs, USB power delivery adapters for laptops and notebooks, and PSUs in monitors and displays.
In the pipeline is another chip, WIW1001 (not to be confused with WIW1101 above) which will be a controller for a complete power supply including a PFC front-end and an LLC regulate dc-dc back-end. An PFC + LLC demo board is available.
Beyond this is WIW2xx (branded ‘WiseWare 2’), a chip series to implement a >1MHz ZVS single-stage PFC+output regulator (circuit right)
Wise Integration is a French fabless GaN transistor and chip company founded in 2020, aiming at power supplies delivering between 30W and 7kW. Headquartered in Hyeres, it has a design centre in Ottawa Canada and a subsidiary in Hong Kong.
For what little information is available on the WIW1101, this Wise web page is a starting point.
Last year, Navitas picked SiC transistors for PFC in its 4.5kW server PSU
