Choosing a resistor to drive an LED with MOSFET - RDS(on)

Thread Starter

John Czerwinski

Joined Jun 19, 2017
18
In calculating the current limiting resistor for an LED being driven by a MOSFET transistor, do you have to take into account the voltage drop of the Rds(on)?

Would the calculation be:
Vdd - Vf (forward voltage of LED) - Voltage drop of Rds(on) / Current draw of LED

Thanks!
 
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