EDIT: I have replaced the FL7732 circuit with the circuit I actually have ("D29B 6L15"). In addition I've added another question.
Please also note that I've accepted that using the 30W driver is not the way to go. I am asking, because I want to understand SMPSs and how they behave.
Where do I find reasonably priced LED-driver, which I can modify for variable currents?
This is a follow up question to modify 30W led driver
I have added a FET on the secondary side and PWM the LEDs. As expected the voltage of the capacitor rises and the brightness of the LEDs changes only very little until ~20% PWM at which point the LED driver apparently can't rise the voltage any longer.
The LEDs are rated twice the power I use them. Receiving a little bit more current while the PWM turns them on should IMO not hurt them.
However I don't know if this could hurt the driver itself.
So my questions:
- is controlling the brightness using a FET and PWM safe for this circuit?
- what could happen / what should I pay attention to?
- is there a cheap / easy way to use existing LED drivers (flyback) to change the brightness of the LEDs.
- The FL7322 circuit has a diode, resistor and capacitor across the primary winding. How important are those.