Dear people,
I have a little question how to use the power MOSFET as a switch.
I have an electric bike which has a light connection which is 6v and is switched by the controller.
As I don't want to put stress on the electronics switching this voltage I want to use a MOSFET to have this signal to switch my more powerful lights which work on 48/52v DC.
I found a basic diagram to use a MOSFET as a switch but the resistors are not rated in value. So I was wondering what I should use for Rin and Rgs
I have a IRF540NPBF to be used for this. The rating for the application is well within the specs , as the max current at 48v is 1A and the load is LED
Thank you in advance for your advice

 

Hi 2024,
I would use a 100R for Rin and a 10k for Rgs.
What is the wattage rating of the lamp?
E
Example: used a IRF530, similar spec to the IRF540 for your application.

 

Those are indeed good values. You can omit RGS if the gate signal is always connected to an input sugnal, but if there is a chance the gate signal can assume a high impedance state, RGS is a good idea to keep the MOSFET off.

 

Hello,

I would take a logic level mosfet like the IRL540, as the gate voltage is only 6 volts.
The IRF540 is hard on at 10 volts at the gate.

Bertus