[LED Driving circuit] Related to MOSFET V(gs)

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1

fig77
fig77376×332 9.71 KB

hello.

  1. The N-MOS used is as follows: (IRF3710)

  2. If you look at the 'IRF3710' data sheet, the V(gs) voltage is ±20[V].

  3. However, in the picture, 24[V] is added to V(gs).

  • PWM signal : 24VDC, 0VDC

Is it okay to think of it this way? Experts, please help.

2

You forgot to attach the link.

Your circuit will not work because there is no common ground between the 24V supply and the source of the PWM signal.

3

@PaulRB

https://pdf1.alldatasheet.com/datasheet-pdf/view/68142/IRF/IRF3703.html

Thank you for answer.

  1. Share the Mosfet PDF file link.

  2. 24V PWM is set to common ‘GND’.

  3. What I'm curious about is that the 'datasheet' says that the V(gs) voltage is 20V or less, but in the circuit I implemented, a PWM signal of 24V is applied.

At this time, I am wondering if there is a circuit problem.
Please answer about my question. thank you

4

Vgs is the voltage between the gate and source of the MOSFET.
In your drawing it is 5V, that is coming from the '5V PWM Source'.

The 24V supply does not connect to the MOSFET's source pin, but to the drain.

EDIT:
The Schematic in post #1 was like this at the time that I answered:
circuit

It has subsequently been edited.

5
  1. Please look at the changed image.
  2. Controlled through 24 PWM signals.

Currently it works fine. However, I wonder if it will break down if it is implemented like this.

6

Editing your first post makes the answer that I gave in post #4 look wrong, and upsets the flow of the topic.

If you really are applying 24V to the gate then expect the MOSFET to fail.