Description

This reference design is an automotive: 400-W: phase-shifted full-bridge converter which generates the 12-V output from a 48-V car battery. The enhanced phaseshifted full-bridge controller implements programmable delays which ensure zero voltage switching (ZVS) over a wide range of operating conditions. The output implements synchronous rectification: which enables fast transient response and a high loop bandwidth. The system regulates 12 V at no load with less than 100 mW of standby power. Pseudo isolation is achieved through a transformer to prevent the 48-V battery from being shorted to the secondary side. The half-bridge gate drivers can withstand a maximum boot voltage of 120-V DC.