I am trying to calculate the power loss in mosfet,which the input current is a train of pulse. Can anyone help me to know what all parameters to be considered.
Thanks in advance.
Thanks in advance.
To determine the rise and fall time dissipation it's generally easier to use V and I since the equivalent R is constantly changing during that time. Thus a simple linear approximation is to multiply the voltage times the ON current times the rise-time and then take 1/2 of that to get the average power. The switching dissipation is then this value times the ratio of the rise-time to the pulse period. Do the same calculation for the fall-time.When it is fully on then you have current squared times rdson. When the edge of a pulse is happening, the it goes through a range of resistances, instead of rdson, as the current is ramping from 0 to max or max to 0. You need to integrate one of the three power expressions, over the rise or fall time, i.e. V i or v squared over R or i squared times R. Then add the dissipation during the rise and fall times to the i squared rdson of the fully-on time.
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