100W Negative Output Power Supply Reference Design for Industrial Applications
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Key Document


The PMP20904 reference design is a negative buck utilizing the LM5117 controller for industrial applications. This design can operate at 24Vin at +/-10%. The design has an output of -24V and capable of sourcing 2A continuous current and up to 4A transient. Switching frequency is set to 200kHz, and a 4 layer PCB is used.

  • Synchronous output rectification
  • Low BOM count and cost, compact solution size
  • Peak efficiency: 94%

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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)21.6
Vin (Max) (V)26.4
Vout (Nom) (V)-24
Iout (Max) (A)4
Output Power (W)96
Input TypeDC
TopologyBuck Boost- Inverting

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5117  5.5-65V Wide Vin, Current Mode Synchronous Buck Controller with Analog Current Monitor  Step-down (buck) regulators  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5117 Download Download
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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 894 16 Nov 2017
Design files (6)
Title Type Size (KB) Date
ZIP 478 16 Nov 2017
ZIP 630 16 Nov 2017
PDF 750 16 Nov 2017
PDF 115 16 Nov 2017
PDF 30 16 Nov 2017
PDF 145 16 Nov 2017

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