NMOS gate driver with isolation

[kit_714]

Hi All,

May I ask for NMOS gate driving method with isolation using IR2110 and IR2117?

For IR2110, without low side MOSFET, the bootstrap capacitor cannot be charged. How can i solve the problem on driving isolation NMOS with high side driver only?

Second, can I use IR2117 directly to achieve my goal? Does the bootstrap capacitor charging problem still exists?

Many thanks.

 

[KlausST]

Hi,

it´s hard to answer as long as we don´t know your circuit, voltages, frequency, duty cycle....

i suppose it is only high side mosfet. Can´t you go to low side mosfet?
galvanic isolation with optocouplers?
Can yo give us more information about your circuit?


Klaus

 

[kit_714]

Um .... Opto will have delay ..... i am not so prefer ...

Simply speaking, i wanna control NMOS with isolation gate driving methods. Any ideas??

Thanks a lot!

 

[Tahmid]

Why not use a gate drive transformer?

However, for a more complete answer/discussion, you should mention your specifications such as frequency, duty cycle, etc.

If you have a sufficient load in place, the bootstrap capacitor can charge. However, why not just put a low-side MOSFET and feed into LIN the signal of HIN inverted?