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 Hi guys, I have couple of question		  New Topic  Reply to Topic
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Hugh_Davenport

Australia
3 Posts
Posted - 05/25/2022 :  22:47:16  Show Profile  Reply with Quote
Hi guys, I have couple of question :
1.) by providing isolation to control IC by pulse xformer, then how the control IC is powered at the first time it powered? since the auxiliary windings doesn't have a voltage at that initial time
2.) do we need more winding to drive the high side mosfet? since we know that the voltage at the gate should be Vth+Main DC Voltage

Thank you
Reply #1

Damien68

France
780 Posts
Posted - 05/26/2022 :  11:22:20  Show Profile  Reply with Quote
to be conductive, a P-Channel mosfet must have a negative Vgs voltage and under than the Vgsth (Vgsth is a negative value for P-chanel mosfet). so voltage of the gate must rather be drawn towards the GND.
compared to an N-Channel, with P-chanel (high side) everything is reversed.

what is a xformer? to make a switching mode power supply, a pulse/signal transformer is not suitable.
Mastery is acquired by studying, with it everything becomes simple
Edited by - Damien68 on 05/26/2022 11:34:32
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