Automotive 400-W, 48-V Battery Input, 12-V Output Power Reference Design


Design files


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.

  • Phase shifted full bridge converter over the input voltage of 36V to 60V DC, output power up to 400W
  • Extendable to 500W with heatsinking, easy to customize 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
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUDA3.PDF (7446 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement


Files used for 3D models or 2D drawings of IC components


Design file that contains information on physical board layer of design PCB

TIDRRV4.PDF (1497 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

AC/DC & DC/DC controllers (external FET)

UCC28951-Q1Automotive green phase-shifted full-bridge controller with SR control for wide input voltage range

Data sheet: PDF | HTML
Half-bridge drivers

UCC27212A-Q1Automotive, 4-A , 120-V half bridge gate driver with 5-V UVLO

Data sheet: PDF | HTML
Low-side drivers

UCC27511A-Q1Automotive 4-A/8-A single-channel gate driver with 5-V UVLO and split outputs

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Automotive 400W, 95% Efficiency, 36-60V to 12V Power Ref Design for Car Battery Jun. 09, 2017
Application note UCC28950 600W Phase Shifted Full Bridge Design Review/Application Report (Rev. D) PDF | HTML Mar. 04, 2022
User guide A Design Review of a Full-Featured 350-W Offline Power Converter Dec. 18, 2013
Application note Modeling, Analysis and Compensation of the Current-Mode Converter Sep. 05, 1999

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TIDA-01179 Automotive Wide Vin Front-End Power Reference Design w/Cold Crank Operation & Transient Protection

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