Hi guys,
Im wanting to generate 14V from 20V using an esp32 and an ultra-low on-resistance N-channel mosfet. I can output a 78khz pwm signal to get an average 14V, but im just trying to figure out how to smooth the signal using an inductor. I dont mind too much about ripple and the circuit will be driving a 1.2A non-inductive load, switching on a few power LEDs for about 500 microseconds and back off for about 9.5 milliseconds (as a 10 millisecond cycle). I'm not too fussed about over heating them as they'll be off 95% of the time. I can't use a buck converter because most are based on P-channel mosfets and its a cob RGB LED with a common positive (Green and blue are 20V). I've got some lowV flyback diodes I just need some help on the inductor value.
Any help is appreciated!
Kind regards,
G.
Im wanting to generate 14V from 20V using an esp32 and an ultra-low on-resistance N-channel mosfet. I can output a 78khz pwm signal to get an average 14V, but im just trying to figure out how to smooth the signal using an inductor. I dont mind too much about ripple and the circuit will be driving a 1.2A non-inductive load, switching on a few power LEDs for about 500 microseconds and back off for about 9.5 milliseconds (as a 10 millisecond cycle). I'm not too fussed about over heating them as they'll be off 95% of the time. I can't use a buck converter because most are based on P-channel mosfets and its a cob RGB LED with a common positive (Green and blue are 20V). I've got some lowV flyback diodes I just need some help on the inductor value.
Any help is appreciated!
Kind regards,
G.