Contents
What is Avalanche rated MOSFET?
So Avalanche Energy is defined as the amount of energy the MOSFET can withstand when it is set into avalanche mode or its breakdown voltage is exceeded. And that value is determined by the Avalanche Current, which is done during an Unclamped Inductive Switching test.
What is breakdown voltage of Mosfet?
Power MOSFET Parasitic Components. Page 5. BREAKDOWN VOLTAGE. Breakdown voltage, BVDSS, is the voltage at which the reverse-biased body-drift diode breaks down and significant current starts to flow between the source and drain by the avalanche multiplication process, while the gate and source are shorted together.
When does Avalanche capability occur in a MOSFET?
However, MOSFETs do not break even at voltage exceeding V DSS (rated voltage) when energy and drain current are within certain limits and temperature is under the rated channel temperature T ch. This is called avalanche capability. The allowable energy is called avalanche energy (E AS) and the current is called avalanche current (I AR ).
What is the allowable energy of avalanche capability?
This is called avalanche capability. The allowable energy is called avalanche energy (E AS) and the current is called avalanche current (I AR ).
How does avalanche current affect the junction temperature?
Therefore, a smaller amount of avalanche energy, corresponding to smaller avalanche current, will raise the junction temperature to T for subsequent pulses. So for increasing duty cycles, the avalanche current required to raise the junction temperature by 25 °C will decrease.
How to calculate single pulse Avalanche energy ( EAS )?
From the figure 11 schematic we can calculate the single pulse avalanche energy (EAS) as: The measured energy values depend on the avalanche breakdown voltage, which tends to vary during the discharge period due to the te mperature increase.