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MOSFET'S can't turn off in isolated gate drive

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HELLO,

In figure 34, page 14 of this smps controller datasheet:-

https://www.icbase.com/pdf/ONS/ONS19500604.pdf

......how can the mosfet's turn off ?

the series capacitor means there is no discharge path for the mosfet gates and they cannot turn off ?

any help appreciated.
 

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