What I'm trying to do:
I have a bunch of RGB LED strips and a controller for them. Obviously to get different colors the controller uses PWM to dim the R, G, or B lines.
Now, I have several strips of LEDs that I want to be able to turn on/off separately and I'd rather use a MOSFET instead of a mechanical switch.
The problem:
The lines are presumably floating between PWM pulses and when a color channel is completely off (i.e. if I set it to red, the blue and green LEDs will be always off).
My thoughts so far:
I'd love to just put an P-channel MOSFET on the common anode for the line. But, I'm not sure if this will cause a problem because likely the drain will be in a floating state any time a color is off.
I know a floating gate causes problems, and a floating source can cause chip damage, but I can't find anything to suggest the effects of a floating drain. Can I presume that since the gate is referenced against the source it should be safe?
I have a bunch of RGB LED strips and a controller for them. Obviously to get different colors the controller uses PWM to dim the R, G, or B lines.
Now, I have several strips of LEDs that I want to be able to turn on/off separately and I'd rather use a MOSFET instead of a mechanical switch.
The problem:
The lines are presumably floating between PWM pulses and when a color channel is completely off (i.e. if I set it to red, the blue and green LEDs will be always off).
My thoughts so far:
I'd love to just put an P-channel MOSFET on the common anode for the line. But, I'm not sure if this will cause a problem because likely the drain will be in a floating state any time a color is off.
I know a floating gate causes problems, and a floating source can cause chip damage, but I can't find anything to suggest the effects of a floating drain. Can I presume that since the gate is referenced against the source it should be safe?