Morning gents,
I have seen in my TPS94211 design that the voltage on the drain of the mosfet is about 18VDC + 8VAC more or less. So basically there is a DC component that is behaving like a constant resistor and on top of that an AC component to adapt to the "shape". I had the idea that adding 3Vf LEDs between the drain and L1- line the dynamic resistance of the LEDs would act as the DC component and the voltage on the drain would go lower. That would increase the light output power and dissipate less heat in the mosfet. Unfortunately it doesn't work like that, the voltage goes higher. I have tried with other mosfets and even darlington transistors and the result is very similar. I'm not expert in mosfets, I always used them as switches. Any idea of how this can be done?
Many thanks,
Miguel