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


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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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Bill of Materials (BOM)

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TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC27212A-Q1  Automotive, 120-V Boot, 4-A Peak, High-Frequency High-Side and Low-Side Driver  Gate Drivers  Sample & Buy View Design Kits & Evaluation Modules
UCC27511A-Q1  Single-Channel High-Speed Low-Side Gate Driver with 5V Negative Input Voltage Handling Ability  Gate Drivers  Sample & Buy Not Available
UCC28951-Q1  Phase-Shifted Full-Bridge Controller for Wide Input Voltage Range   Offline & isolated DC/DC controllers & converters  Sample & Buy Not Available

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
UCC27212A-Q1 Download
UCC27511A-Q1 Download Download
UCC28951-Q1 Download -

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

Application notes (2)
Title Abstract Type Size (KB) Date Views
PDF 935 09 Jun 2011 221
PDF 189 05 Sep 1999 158
User guides (2)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 7446 09 Jun 2017 39
PDF 4049 18 Dec 2013 82
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 483 17 Jul 2017 2
ZIP 710 17 Jul 2017 38
PDF 1497 17 Jul 2017 9
PDF 224 17 Jul 2017 7
PDF 66 17 Jul 2017 17
PDF 244 17 Jul 2017 204
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