Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Gate resistors in two switch forward

Status
Not open for further replies.

Velkarn

Full Member level 3
Joined
Feb 17, 2014
Messages
153
Helped
81
Reputation
162
Reaction score
84
Trophy points
1,308
Activity points
2,067
Hello, all!

two switch forward converter 90-260VAC in, 24V, 8A out.
i am driving mosfets with IR2113 driver, shematic from IR appnote.
please advice, how to select the value of gate resistors? is there a need to make circuit with diode (for fast discharge of gate capacitance)?
 

KlausST

Super Moderator
Staff member
Joined
Apr 17, 2014
Messages
19,486
Helped
4,308
Reputation
8,621
Reaction score
4,262
Trophy points
1,393
Activity points
129,197
Hi,

It depends on many parameters.
Transistor values
Switching frequency
Dead time
Pcb layout
Schematic
Driver values.

The resistor prevents ringing by decreasing output voltage rise rate.
A low impedance power path of the fet's source, a low coss of the fet, a low capacitive load path could also decrease ringing.
And the connection from fet source to driver should be low impedance and additionall should not carry the power current... individual routing of driver and power path...

Klaus
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top