Hey guys, will this work?

[mister_e]

HPWM limit is as stated in your manual. To reach higher frequency, you need to write the PWM register manually. Use PICMultiCalc to find PR2 and Timer Prescaller value, then plug the DutyCycle values in CCP1CON and CCPR1L registers... double check your datasheet to confirm.

For Buck converter, usually the higher the better for reducing coil and capacitors size.

Make sure your ADCONx setting don't interfer with PBP ADCINs defines. You may want to place your define after those ADCONx lines, or get rid of ADCIN. Once again PICMultiCalc may give you some hints about min acquisition time and faster clock conversion source.... which is probably a must for buck converter. Don't forget to check the Resolution for the frequency you choosed. @8Mhz & 200KHz, you should have something like 7 bit of resolution.. 40 dutycycle steps... not bad, not good, depending how fancy you want it.

In some case it's not a so good idea to use a PIC for that, just for the reaction time and what your PIC will also need to do apart the voltage regulation.