This design guide describes the design of asymmetric PWM half-bridge converters using Fairchild FSFA-series power switches (FPSTM) with a current doubler and synchronous rectifier.
The document introduces high-frequency switch-mode power supply (SMPS) topologies, contrasting load-resonant techniques with zero-voltage-transition (ZVT) methods. It highlights the asymmetric PWM half-bridge converter as a popular ZVT topology suitable for applications requiring high output current and low output voltage.
The FSFA-series Fairchild Power Switches (FPS™), which integrate a PWM controller and MOSFETs.
The maximum duty cycle should be restricted up to 50% to regulate the output voltage.
An appropriate gate voltage is between 10 V and 20 V.
The analysis assumes ZVS is achieved with very short duration and all circuit elements are ideal.