High voltage buck converter reference design for BMS applications
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Key Document


This non-isolated buck converter provides a fixed output of 14 V at 130 mA for BMS applications. It operates over an input voltage range of 18 Vdc – 144 Vdc after a startup greater than 23 V. 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 (144 V)
  • Achieves an efficiency of between 79% - 86% (30-V to 120-V input, 130-mA output)
  • Low component count and small size
  • Utilizes a single standard inductor (no transformer required)

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Schematic/Block Diagram

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Design Files

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(Output Voltage 1)
Vin (Min) (V)23
Vin (Max) (V)144
Vout (Nom) (V)14
Iout (Max) (A).13
Output Power (W)1.82
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 5990 11 Aug 2020
Design files (6)
Title Type Size (KB) Date
ZIP 547 11 Aug 2020
ZIP 553 11 Aug 2020
PDF 377 11 Aug 2020
PDF 105 11 Aug 2020
PDF 136 11 Aug 2020
PDF 131 11 Aug 2020

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