What is the LT3761's interarnal pwm maximimum frequency? In other words what is the minimum value for the Cpwm? I used 1nF to achive around 10kHz, everthing looks fine but is there any long term considerations?
Thank you in advance,
10kHz is fine to use.
The higher you go in frequency, the lower the maximum dimming range.Typically, we just PWM dim at about 200Hz (or lowest possible so that we remain above 100Hz.)
That is why the caps recommended in datasheet and demo circuit are around 300Hz.Lowest dimming frequency with maximum range.