Transient response improvement of digitally controlled buck-type dc-dc converter with feedforward compensator

This paper describes transient response improvement of digital PID and I-PD controlled synchronous rectification buck-type dc-dc converter using feedforward compensator. Numerical formulae of the feedforward compensator were introduced by taking into account the relational expression including input voltage, output voltage, load current and ON-time of high-side switch. The steady-state characteristics of the converter with feedforward compensator were the same as the converter without one. However, input and load transient response were significantly improved.