Nihaludeen
Member level 2
To find mosfets gate to source voltage (Vgs)
I have to find out the gate loss of the mosfet (irf3205) in my circuit, for high side fet.
The formula to calculate the gate charge loss of a mosfet is,
Pgate = Qg * Vgs * Fsw
Pgate= Power loss at gate
Qg= gate charge
Vgs= gate to source voltage (voltage require to drive the mosfets gate)
Fsw= Switching frequency
datesheet of irf3205
http://www.irf.com/product-info/datasheets/data/irf3205.pdf
Pgate= 146nC * 40v * 1Khz
= 146*40*1* 10^-9 * 10^3
= 5840 * 10^-6
= 0.0058Watts
Is the about gate power loss is right?, Because i have a doubt in "Vgs".
I have to switch 40v supply, so the high side mosfet require 40v gate voltage to switch the vcc(40v) supply.
I have to find out the gate loss of the mosfet (irf3205) in my circuit, for high side fet.
The formula to calculate the gate charge loss of a mosfet is,
Pgate = Qg * Vgs * Fsw
Pgate= Power loss at gate
Qg= gate charge
Vgs= gate to source voltage (voltage require to drive the mosfets gate)
Fsw= Switching frequency
datesheet of irf3205
http://www.irf.com/product-info/datasheets/data/irf3205.pdf
Pgate= 146nC * 40v * 1Khz
= 146*40*1* 10^-9 * 10^3
= 5840 * 10^-6
= 0.0058Watts
Is the about gate power loss is right?, Because i have a doubt in "Vgs".
I have to switch 40v supply, so the high side mosfet require 40v gate voltage to switch the vcc(40v) supply.