Fast recovery diode
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Fast recovery diode (FRD) is a semiconductor diode with good switching characteristics and short reverse recovery time. It is mainly used in switching power supplies, PWM pulse width modulators, inverters and other electronic circuits as high-frequency rectifier diodes. Free-wheeling or damper diodes are used. The internal structure of the fast recovery diode is different from that of an ordinary PN junction diode. It belongs to a PIN junction diode, that is, a base region I is added between the P type silicon material and the N type silicon material to form a PIN silicon wafer. Since the base area is thin and the reverse recovery charge is small, the fast recovery diode has a short reverse recovery time, a low forward voltage drop, and a high reverse breakdown voltage (withstanding voltage).
Precautions:
1) Some single tubes, a total of three pins, the middle is empty, generally cut off at the factory, but there are no shear.
2) If one pipe is damaged in the pipe, it can be used as a single pipe.
3) When measuring the positive pressure drop, you must use R×1. If the R×1k file is used, the measured VF value will be significantly lower because the test current is too small and far below the normal operating current of the tube. In the above example, if R × 1k is selected, the forward resistance is equal to 2.2kΩ, and n'=9. The VF value thus calculated is only 0.27V, which is much lower than the normal value (0.6V).
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