Hi, I had some question about the bootstrap capacitor on gate driver.
first , the bootstrap capacitor is used because the voltage on the high side drivers gate need to be about 10-15 volts higher than the voltage on its drain. However , if my input supply is about 20v and the gate voltage is not higher than the source voltage as well . Is it possible to turn on?
Second, to turn on an N-channel FET , we need a gate voltage which is higher than the source voltage. How can this be? the gate voltage cannot supply more than 15v right? if my input supply also contribute about 20v, can it be turn on?
Thank you so much for your reply ... Really appreciate for your all helping.
Thank you
first , the bootstrap capacitor is used because the voltage on the high side drivers gate need to be about 10-15 volts higher than the voltage on its drain. However , if my input supply is about 20v and the gate voltage is not higher than the source voltage as well . Is it possible to turn on?
Second, to turn on an N-channel FET , we need a gate voltage which is higher than the source voltage. How can this be? the gate voltage cannot supply more than 15v right? if my input supply also contribute about 20v, can it be turn on?
Thank you so much for your reply ... Really appreciate for your all helping.
Thank you