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What is the maximum reverse voltage across the diode?
Silicon diodes have a forward voltage of approximately 0.7 volts. Germanium diodes have a forward voltage of approximately 0.3 volts. The maximum reverse-bias voltage that a diode can withstand without “breaking down” is called the Peak Inverse Voltage, or PIV rating.
What is the peak inverse voltage across each diode?
Peak Inverse Voltage or PIV is the maximum voltage appearing across the p-n junction diode when it is non-conducting. A diode do not conducts when it is reversed biased. This means peak inverse voltage is the maximum reversed biased voltage across the diode terminals when it is put in a circuit.
How is PIV diode calculated?
PIV in the Diode
- Peak inverse voltage in the diode is the peak value of the inverse voltage across the diode in reverse bias condition. Consider the circuit shown below to calculate the PIV of the silicon diode or peak inverse voltage of the diode.
- PIV of Diode = Esm.
- PIV = 2Esm – 0.7.
What is the maximum reverse current of a diode?
Maximum reverse current = IR, the amount of current through the diode in reverse-bias operation, with the maximum rated inverse voltage applied (VDC). Sometimes referred to as leakage current.
How is the forward voltage of a diode described?
In reality, the forward voltage is described by the “diode equation.”. Maximum (average) forward current = IF(AV), the maximum average amount of current the diode is able to conduct in forward bias mode.
What is the reverse recovery time of a diode?
Reverse recovery time = trr, the amount of time it takes for a diode to “turn off” when the voltage across it alternates from forward-bias to reverse-bias polarity. Ideally, this figure would be zero: the diode halting conduction immediately upon polarity reversal.
Why are diodes rated higher than the average?
Again, this rating is limited by the diode junction’s thermal capacity, and is usually much higher than the average current rating due to thermal inertia (the fact that it takes a finite amount of time for the diode to reach maximum temperature for a given current). Ideally, this figure would be infinite.