PWM
PWM nonlinearity that software can’t fix
There’s been interest recently here in the land of Design Ideas (DIs) in a family of simple interface circuits for pulse width modulation (PWM) control of generic voltage regulators (both linear and switching). Members of the family rely on the regulator’s internal voltage reference and a discrete FET connected in series with the regulator’s programming…
Improve PWM controller-induced ripple in voltage regulators
Simple linear and switching voltage regulators with feedback networks of the type shown in Figure 1 are legion. Their output voltages are the reference voltage at the feedback (FB) pin multiplied by 1 + Rf / Rg. Recommended values of Cf from 100 pF to 10nF increase the amount of feedback at higher frequencies, or…