In the application I'm currently working on there are six PWM outputs of the variable frequency (from 4 to 200 Hz) and with duty cycle from 0.25% to 100%. In my previous project there was a PWM of the fixed frequency (4 kHz) with the same range of duty cycle. In both cases the controller was LPC767 (has no PWM hardware).
Is that suitable? If not, what are the required frequency and duty cycle ranges?
Michael.