I have an RGB LED controller which controls the brightness using a 100 Hz PWM, seemingly without any built-in smoothing at all. (recorded it with a soundcard, and those pulses are 100 percent rectangular. 🙂
I want the resulting voltage coming to LEDs to be as flat as possible, using a custom built filter/simple scheme, which should not be too expensive (otherwise it makes more sense to buy a better controller in the first place).
The LEDs are going to be used for lighting, so the filter should be ready for pretty high power (~100W max).
How should I go about configuring such a filter? Should I use an RC or LC filter? Just one or a series of filters? How do I decide on the electronic properties of the elements (capacity, inductance, etc.)?
UPD: by "as flat as possible" I mean as close as a simple, cheap-ish filter system based on usual components is going to get me. A 99.99% flat line is NOT a requirement! Just a filter that will smooth it out as best it can.