Compact, Efficient Unidirectional 48V to 12V@400W Automotive Power Supply Reference Design PMP20657 (ACTIVE)

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Key Document


The PMP20657 reference design is a compact, efficient unidirectional 48V to 12V @ 400W power converter. The design is pseudo-isolated to protect 12V loads. The phase-shifted full-bridge topology achieves over 95% peak efficiency. Light-load mode enables <100mW standby power with full regulation on 12V. 300kHz/600kHz switching frequency provides a small solution size.

  • <100mW no-load power consumption designed for automotive 48V battery
  • Synchronous rectification and adaptive delays for high peak efficiency
  • 300kHz/600kHz switching frequency for 2.5" x 3.5" powertrain
  • Pseudo-isolation to protect 12V loads
  • Low-cost, all ceramic output capacitor solution

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Schematic/Block Diagram

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Design Guide

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Design Files

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(Output Voltage 1)
Vin (Min) (V)36
Vin (Max) (V)60
Vout (Nom) (V)12
Iout (Max) (A)33.33
Output Power (W)399.96
Input TypeDC
TopologyFull Bridge- Phase Shifted

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

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User guides (1)
Title Type Size (KB) Date
PDF 1434 17 Nov 2017
Design files (6)
Title Type Size (KB) Date
ZIP 1444 17 Nov 2017
ZIP 736 17 Nov 2017
PDF 1047 17 Nov 2017
PDF 223 17 Nov 2017
PDF 64 17 Nov 2017
PDF 216 17 Nov 2017

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