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How to calculate the capacitor of bootstrap for hip4082(full bridge driver)?

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ehs dav

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HI

How can i calculate the capacitor of bootstrap for hip4082(full bridge driver)?
should be the PWM INPUT voltage less than 12(ahi $ bhi)?

www.intersil.com/data/fn/fn3676.pdf

vcc=74
transistors:irfp460 or irfp250
frequency:60 hz(type1)
or 150 khz(type2)

thanx
 

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