Fast Recovery Diode (FRD): how does it Work? And its characteristics

WHAT IS A FAST RECOVERY DIODE?

A fast recovery diodes is semiconductor diode which has short reverse recovery time than conventional diodes. It is suitable for high frequency ratification applications. Due to short reverse recovery time it is also known as fast diode or fast switching. It can operate switching up to 100 kHz.

When the diodes is in reverse bias, the diodes does not withstand voltage until it enters reverse bias. In reverse bias, the current flow for a specific time. And this specific time is called reverse recovery time (TRR).

The reverse recovery time of fast recovery diode is lie in between tens of nano seconds to 100 nano seconds. While the reverse recovery time for normal PN junction diodes lie in between a few micro-second to tens of micro-second. Hence the reverse recovery time (TRR) of fast recovery diodes is low as compare to conventional diode.