A new non-symmetric phase, integral-lead controller for PWM DC-DC converters

This paper introduces a new nonsymmetric phase, integral-lead controller that can be used in pulse-width-modulated (PWM) DC-DC power converters. This new controller can provide a peak phase boost of up to 165°, with its phase returning to 0° at high frequencies. This phase characteristic is much improved over that of the commonly used symmetric phase integral-lead controller which provides a peak phase boost of up to 165°, but with -90° of phase at high frequencies. The nonsymmetric phase controller provides to a DC-DC converter, increased gain margin, increased 3 dB bandwidth and decreased phase at high frequencies, over that of a symmetric phase controller. A boost DC-DC converter design example illustrates the improved performance when using the nonsymmetric phase controller over the symmetric phase integral-lead controllers