This reference design is an automotive, 400W, phase-shifted full-bridge converter which generates the 12V output from a 48V 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 12V at no load with less than 100mW of standby power. Pseudo isolation is achieved through a transformer to prevent the 48V battery from being shorted to the secondary side. The half-bridge gate drivers can withstand a maximum boot voltage of 120VDC.
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