Design of a Highly-Efficient Pwm Power Supply

This paper deals with design considerations for a 5-watt regulated power supply, capable of operation at 80% efficiency. The system, using pulse-width modulation as the regulating mechanism, is characterized as a dc step-down transformer. The interrelationship of such parameters as loop gain, switching frequency, and filter cutoff frequency are considered. The circuit exhibits an output resistance of 1 milliohm and a full load transient recovery time of 250 ps and has been designed for microcircuit realization.