Hi,
I'm using PWM 50% for my bed (Felixprinter, rated as 12V, used with 19V). As my bed acts as a loudspeaker I tried to use a higher PWM frequency of 15kHz to reduce the noise (bed no more audible). But this was no good, because the switching transistor heated up to 150°C! So to avoid damage to the board it would be good to prevent in Software to go so high in frequency.
More infos can be found on:
http://weigu.lu/other_projects/3d_printing/felix4_32bit/index.html
Greetings
weigu