High voltage buck converter reference design for E-motorcycle BMS applications
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Key Document


This non-isolated buck converter provides a fixed output of 12V at 400mA for BMS applications. It operates over an input voltage range of 50Vdc – 150Vdc after a startup greater than 40V. Operating in discontinuous conduction mode (DCM), this converter utilizes the UCC28730 controller, which is referenced to the switch node. It offers high efficiency and low cost in a compact form factor.

  • Unique floating controller ground reference allows operation at high input voltage (150-V)
  • Achieves an efficiency of between 84% - 87% (50-V to 150V input, 400-mA output)
  • Low component count and small size
  • Utilizes a single standard inductor (no transformer required)

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(Output Voltage 1)
Vin (Min) (V)50
Vin (Max) (V)150
Vout (Nom) (V)12
Iout (Max) (A).4
Output Power (W)4.8
Input TypeDC
TopologyBuck- Non Sync

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC28730-Q1  Zero-power standby PSR Flyback controller for automotive  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
UCC28730-Q1 Download

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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 3288 09 Sep 2020
Design files (6)
Title Type Size (KB) Date
ZIP 547 09 Sep 2020
ZIP 558 09 Sep 2020
PDF 371 09 Sep 2020
PDF 99 09 Sep 2020
PDF 135 09 Sep 2020
PDF 123 09 Sep 2020

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