48V battery input, 12V output power reference design

30th August 2018
Posted By : Enaie Azambuja
48V battery input, 12V output power reference design

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.


  • Phase shifted full bridge converter over the input voltage of 36V to 60VDC, output power up to 400W
  • Extendable to 500W with heatsinking, easy to customise per customer needs
  • Soft-switching, phase-shifted full bridge using UCC28951-Q1 analog controller, Grade 1
  • Regulated 12V output with 36V to 60V input and with <100mW standby power at no load
  • Adaptive delay control for high efficiency across load range

Discover more here.

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