Buck regulator with N-mosfet

MacIntoshCZ

Active Member

• Mar 15, 2021

• #1

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**

 

Last edited: Mar 15, 2021

rjenkinsgb

Well-Known Member

Most Helpful Member

• Mar 15, 2021

• #2

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

 

MacIntoshCZ

Active Member

• Mar 15, 2021

• #3

rjenkinsgb said:

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

Click to expand...

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

 

ChrisP58

Well-Known Member

Most Helpful Member

• Mar 15, 2021

• #4

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

 

MacIntoshCZ

Active Member

• Mar 15, 2021

• #5

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 =).