The controller is FAN2306, which is a constant-on-time controller from Fairchild Semiconductor. The circuit parameters are: V IN = 12V V O = 1.2V F SW = 500kHz L O = 1µH C O = 4x47µF MLCC R T ...

The best tolerance capacitor I can find is 1%, and board capacitance can approach 1% of 1nF. Let’s say the best case is a 1.2% time constant uncertainty. How do you propose to adjust the trimpot in ...