TDK has moved to GaN transistors to reduce the size of its 504W ac-dc power supply, which has a 101.6 x 61mm footprint. Within the TDK-Lambda-branded PFH500F‑28, a pair of GaN transistors have been used in a ‘bridge-less’ front-end power factor correction stage, raising efficiency in the PFC stage to 98.6% and peak efficiency of the ...

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