FAST RECOVERY DIODES

Fast recovery diodes are designed to provide ultra high switching speed. They are mainly classified into two :-

Diffused PN Junction Diodes
Metal Semiconductor Diodes

The total recovery time for a P-N Junction diode can be substantially reduced by introducing efficient recombination centers, such as Au and Si, to the bulk material. Although the recovery time is directly proportional to the lifetime, it is not possible to reduce recovery time to Zero by introducing an extremely large number of recombination centers, because the reverse generation current of a P-N junction is proportional to recombination centers. For direct band gap Semiconductors, such as GaAs, the minority carrier lifetimes are much smaller than that of silicon. This results in ultrahigh speed GaAs P-N junction diodes with recovery times of the order of 0.1ns or less.

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OP AMP INTEGRATOR CALCULATOR

Enter the Input Voltage,Vin: Volts Enter the Frequency, f: Hertz Enter the Input Resistance, Rin: Ohms Enter the Value of Capacitor, C: Farads Output Voltage, Vout: Volts OP AMP based Integrator Tutorial and Design

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I’ve already shown how to drive an N-channel MOSFET (or even an IGBT) in both high-side and low-side configurations in a multitude of ways. I’ve also explained the principles of driving the MOSFETs in these configurations. The dedicated drivers I’ve shown so far are the TC427 and IR2110. Some people have requested me to write up on MOSFET drive using the very popular TLP250. And I’ll explain that here. The TLP250, like any driver, has an input stage, an output stage and a power supply connection. What’s special about the TLP250 is that the TLP250 is an optically isolated driver, meaning that the input and output are “optically isolated”. The isolation is optical – the input stage is an LED and the receiving output stage is light sensitive (think “photodetector”). Before delving any further, let’s look at the pin configuration and the truth table. Fig. 1 - TLP250 Pin Configuration Fig. 2 - TLP250 Truth Table Fig. 1 clearly shows the input LED side and the receiving photodetector as well...

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