Buck regulator with N-mosfet

[MacIntoshCZ]

How mosfet can be turned on in this simplified version which use schotky diode? Only with gate driver transformer?

With this synchronous version it could use bootstrap capacitor for Q1:

https://upload.wikimedia.org/wikipedia/commons/c/ca/Commutation_cell_in_converters.svg

**broken link removed**

 

[rjenkinsgb]

Either a P channel FET with the gate being switched towards negative, or an N channel with a bootstrapped driver.

 

[MacIntoshCZ]

Either a P channel FET with the gate being switched towards negative, or an N channel with a bootstrapped driver.

Yes i know about P channel, i just dont like to use them. They are more expensive and its harder to choose one.

 

[ChrisP58]

Then use a bootstrap driver. That's how most integrated converters drive their n-channel mosfets.

 

[MacIntoshCZ]

Ok thanks, i will probably use complete IC for synchronous buck converter. Since i know how its done i want use as low parts as possible =).