TIDUET3 February   2021

 

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2.4.1.6 Boost Diode

The output diode must have a blocking voltage that exceeds the output overvoltage of the converter and an average current that exceeds Iout(max). In CCM PFC topology, the boost diode undergoes hard turnoff and hence suffers from reverse recovery loss. To reduce the reverse recovery loss, it is better to select an ultra-fast diode or silicon-carbide diode. Silicon-carbide diodes have no reverse recovery loss, but the cost is higher than silicon ultra-fast diodes.