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MOSFET (Si/SiC) Forum Discussions

User19339
Level 1
First question asked
Level 1
Hello
irf4905 mosfet is has -20v max gate voltage,and threshold voltage 2-4v
so if u use this mosfet for 30v driving(drain to source voltage), how i can drive?
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1 Solution
dpinto
Employee
First solution authored Welcome!
Employee
Hi Yokan,

In order for your to fully turn-on a Pchannel MOSFET, you need the gate voltage to be at least 10V below your source voltage. The -10V Vgs voltage will fully enhance the device and give you the low Rds(on) which is specified on the datasheet.

Regards

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1 Reply
dpinto
Employee
First solution authored Welcome!
Employee
Hi Yokan,

In order for your to fully turn-on a Pchannel MOSFET, you need the gate voltage to be at least 10V below your source voltage. The -10V Vgs voltage will fully enhance the device and give you the low Rds(on) which is specified on the datasheet.

Regards
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