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Offline SMPS isolated gate drive

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eem2am

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hello,

i am trying to do an efficient isolated gate drive for a MOSFET in offline SMPS.:-

2vjueyx.jpg


do you think the enclosed NPN turn-off circuit would be very efficient ?

-i mean would the resistors connected to "Qinv"'s base need to be be small Ohmic values?
 

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