Hi,
I have a circuit that drives 5 leds in series. The Leds are turned on and off via a P-channel Mosfet with Low RDS On.
The gate is connected to a microcontroller. The Led series have a current limiting resistor as normal.
My question is: if I drive the mosfet gate with a PWM signal (1Khz for instance) with a maximum duty cicle of about 95% (so the Leds never get fully on all the time) it will be possible not use the current limiting resistor?
I'm aware of the avalanche effect but id the led only stays on for a limited time with will be possible without destroy the LEDs in a short time?
Thanks
Joaquim
I have a circuit that drives 5 leds in series. The Leds are turned on and off via a P-channel Mosfet with Low RDS On.
The gate is connected to a microcontroller. The Led series have a current limiting resistor as normal.
My question is: if I drive the mosfet gate with a PWM signal (1Khz for instance) with a maximum duty cicle of about 95% (so the Leds never get fully on all the time) it will be possible not use the current limiting resistor?
I'm aware of the avalanche effect but id the led only stays on for a limited time with will be possible without destroy the LEDs in a short time?
Thanks
Joaquim