Hi all,
I am trying to select the bootstrap components (capacitor and diode), to be used with the gate driver LM5106 (for a synchronous buck or boost application).
I am using the N- MOSFET IPP075N15N3 G, whose total gate charge (max value) is 93C. I suppose that is the charge I need to supply to the gate to turn the mosfet on.
I would like to select the bootstrap diode.
- Bootstrap diode voltage rating: same as DC bus voltage rating (e.g. 100V)
- Bootstrap diode current rating If? Is it correct to use If=Qg*fsw, where Qg is the total gate charge and fsw is the converter switching frequency (e.g.) 200kHz, so in this case If = 0.0186A?
It looks like a rather small current rating value, I wanted to make sure it is correct.
Also, is it safe NOT to use a boot resistor in series with the bootstrap diode? Or do I have to include a boot resistor in series with the boot diode in my circuit? If so how do I choose the boot resistor?
Thanks a lot,
Leonardo
