Despite having access to an oscilloscope, [Brian] aka [schoolie] has come up with his own method for measuring PWM period and duty cycle without a scope, just in case there’s ever a PWM emergency!

Set the PWM frequency to 38 kHz and the duty cycle somewhere in the 33%-50% range, and you’re set. But what if you don’t have a competent PWM generator? Such was the case that prompted ...

Figure 2 Simple circuit for regulator programming with PWM where Vout ranges from 0.8 V to 10 V as the duty factor (DF) goes from 0 to 1. The Cf capacitance required for 1-lsb PWM ripple attenuation ...