Can i use 1k resistor on each gates?

Thread Starter

Khaleef

Joined Mar 22, 2017
78
Following a YouTube video of a Mosfet Spot Welder, a 1k resistor was was tied to 10 paralleled Mosfets which works well in the video.

Building the same, a friend suggests I use individual 10ohms resistor on each Mosfet gate but I have a lot of 1k resistors.

Can i use the 1k on each of the 10 mosfet?
 

Ian0

Joined Aug 7, 2020
3,754
Following a YouTube video of a Mosfet Spot Welder, a 1k resistor was was tied to 10 paralleled Mosfets which works well in the video.

Building the same, a friend suggests I use individual 10ohms resistor on each Mosfet gate but I have a lot of 1k resistors.

Can i use the 1k on each of the 10 mosfet?
Depends on the MOSFET gate capacitance and the switching frequency.
Work out the time constant (1k x gate capacitance).
The MOSFET will dissipate a quarter of the load for the duration of the time constant twice every switching cycle, in addition to its resistive losses.
so P(MOSFET) ≈ ½P(load) * f * time constant + I(load) * Rds(on)
 

Thread Starter

Khaleef

Joined Mar 22, 2017
78
Depends on the MOSFET gate capacitance and the switching frequency.
Work out the time constant (1k x gate capacitance).
The MOSFET will dissipate a quarter of the load for the duration of the time constant twice every switching cycle, in addition to its resistive losses.
so P(MOSFET) ≈ ½P(load) * f * time constant + I(load) * Rds(on)
Thanks Ian0

The mosfet I use is IRF3713. I really dont know much of the Mosfet capacitance calculation.
 
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