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


Design files


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
Output voltage options PMP20657.1
Vin (Min) (V) 36
Vin (Max) (V) 60
Vout (Nom) (V) 12
Iout (Max) (A) 33.33
Output Power (W) 399.96
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Full Bridge- Phase Shifted
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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.

TIDUDU9.PDF (1503 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more


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

TIDCE06.ZIP (1444 K)

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

TIDRTI4.PDF (1047 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

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Technical documentation

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Type Title Date
* Test report PMP20657 Test Results Nov. 17, 2017

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