When selecting fast recovery diodes, we should first understand the advantages and unsatisfied conditions of fast recovery diodes. Do you know the advantages of fast recovery diodes?
Fast recovery diode is a kind of semiconductor diode with good switching characteristics and short reverse recovery time. Gold doping measures are mostly adopted in the process. PN junction structure is adopted in the structure, and some adopt improved pin structure.
It is mainly used in switching power supply, PWM pulse width modulator, frequency converter and other electronic circuits as high-frequency rectifier diode, freewheeling diode or damping diode.
The internal structure of fast recovery diode is different from that of ordinary PN junction diode. It belongs to pin junction diode, that is, the base region I is added between p-type silicon material and n-type silicon material to form pin silicon wafer. Because the base region is very thin and its reverse recovery charge is very small, the reverse recovery time of the fast recovery diode is short, the forward voltage drop is low and the reverse breakdown voltage is high.
The fast recovery diode has a forward conduction voltage drop of 0.8-1.1v and a reverse recovery time of 35-85n. It can quickly convert between on and off, which improves the service frequency of the device and improves the waveform.