On the selection of control-law coefficients for multi-loop PWM switching regulators

The relationship between the control-law coefficients and the closed-loop transfer functions for second-order, multiloop, pulsewidth-modulated (PWM) switching regulators is examined. Detailed results are presented for input impedance, output current susceptibility, input voltage susceptibility, and output impedance of the basic buck, boost and buck-boost regulators. The relationship is used as a basis for selecting the feedback and feedforward coefficients for maximum performance of the regulators.<<ETX>>