Internal block diagram as shown in figure is TI TPS54335 Buck circuit, I drew the output of the external circuit, the other Pin feet not painting, consult everybody a great god, and when the FET OFF the upper side FET ON, current direction, right?
If the current direction, so is the side of the FET body diode conduction? Then the underside FET is not controlled!
Please teach a great god!!!!!!

CodePudding user response:

Under the direction of current is right, the ordinary BUCK side not FET, only diodes, FET to replace the diode is in order to improve the efficiency,
FET controlled by Logic circuit,
1) on the FET conduction, FET cut-off,
2) FET on the globe, secondary FET cut-off, body under the pipeline through
3) FET on the globe, the FET conduction (ZVS)

4) FET on the globe, secondary pipeline flux FET cut-off, body under the
5) on FET conduction, FET under deadline

CodePudding user response:

Upstairs said is right, the underside FET or controlled, because it on resistance is very small, equivalent to short circuit when conducting body diode is off, so although the body diode is not controlled, but has no effect, and is useful in the dead zone time,

CodePudding user response:

reference 1st floor alvvin_luo response:

current direction is right, ordinary BUCK side didn't FET, only diodes, FET to replace the diode is in order to improve the efficiency,
FET controlled by Logic circuit,
1) on the FET conduction, FET cut-off,
2) FET on the globe, secondary FET cut-off, body under the pipeline through
3) FET on the globe, the FET conduction (ZVS)

4) FET on the globe, secondary pipeline flux FET cut-off, body under the
5) on FET conduction, the FET as

thank you!
For ZVS zero voltage switch technology is not very understanding,
I had is if the current direction is right, then the current is flowing from S FET D?
Also please feel free to comment, thank you!

CodePudding user response:

reference weixin_45771565 reply: 3/f

Quote: refer to 1st floor alvvin_luo response:

current direction is right, ordinary BUCK side didn't FET, only diodes, FET to replace the diode is in order to improve the efficiency,
FET controlled by Logic circuit,
1) on the FET conduction, FET cut-off,
2) FET on the globe, secondary FET cut-off, body under the pipeline through
3) FET on the globe, the FET conduction (ZVS)

4) FET on the globe, secondary pipeline flux FET cut-off, body under the
5) on FET conduction, the FET as

thank you!
For ZVS zero voltage switch technology is not very understanding,
I had is if the current direction is right, then the current is flowing from S FET D?
Also please feel free to comment, thank you!

Can flow from S to D

CodePudding user response:

Alvvin_luo

reference 4 floor response:

Quote: refer to the third floor weixin_45771565 response:

Quote: refer to 1st floor alvvin_luo response:

current direction is right, ordinary BUCK side didn't FET, only diodes, FET to replace the diode is in order to improve the efficiency,
FET controlled by Logic circuit,
1) on the FET conduction, FET cut-off,
2) FET on the globe, secondary FET cut-off, body under the pipeline through
3) FET on the globe, the FET conduction (ZVS)

4) FET on the globe, secondary pipeline flux FET cut-off, body under the
5) on FET conduction, the FET as

thank you!
For ZVS zero voltage switch technology is not very understanding,
I had is if the current direction is right, then the current is flowing from S FET D?
Also please feel free to comment, thank you!

Can flow from S to D

thank you!
But always feel very strange, the current and that's how is the current direction of the MOSFET,

CodePudding user response:

Alvvin_luo

reference 4 floor response:

Quote: refer to the third floor weixin_45771565 response:

Quote: refer to 1st floor alvvin_luo response:

current direction is right, ordinary BUCK side didn't FET, only diodes, FET to replace the diode is in order to improve the efficiency,
FET controlled by Logic circuit,
1) on the FET conduction, FET cut-off,
2) FET on the globe, secondary FET cut-off, body under the pipeline through
3) FET on the globe, the FET conduction (ZVS)

4) FET on the globe, secondary pipeline flux FET cut-off, body under the
5) on FET conduction, the FET as

thank you!
For ZVS zero voltage switch technology is not very understanding,
I had is if the current direction is right, then the current is flowing from S FET D?
Also please feel free to comment, thank you!

Can flow from S to D

thank you!
But the current and that's the MOSFET current direction is reverse, feel very strange,

CodePudding user response:

Which book are you from above? Circuit? MOSFET should see semiconductor structure, there is a depletion layer, a channel, which direction and flow of electric current has nothing to do,
https://www.cnblogs.com/Atsea/p/3723858.html
His look oh