Protected DC-bus input power and control power supply reference design for low-voltage servo drives


Design files


This reference design uses an ORing controller, the LM5050-1 to provide protection against reverse polarity and reverse current. In conjunction, the LM5069 hot swap controller is used for overcurrent, over voltage, under voltage protection, and inrush current limitation. The design also features power rails for the control electronics including the gate drive, encoder and MCU circuitry.

  • Protect the DC bus voltage against over voltage, reverse polarity, overcurrent and inrush current.
  • Prevent reverse current flow back into the common DC bus supply during motor braking.
  • Ability to withstand up to 100-V transients on the DC link (48 V nominal).
  • Option to power the MCU using the USB for configuration in absence of DC bus input.
  • Protect the encoder supplies (both from the DC bus and external back up battery) against short-circuit fault.
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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.

TIDUES3.PDF (3452 K)

Reference design overview and verified performance test data

TIDM357.PDF (263 K)

Detailed schematic diagram for design layout and components

TIDM358.PDF (102 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDM359.PDF (209 K)

Detailed overview of design layout for component placement

TIDM361.ZIP (2953 K)

Files used for 3D models or 2D drawings of IC components


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

TIDM360.PDF (1163 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
* Design guide Protected DC Bus Input Power & Control Power Supply Ref. Des. for Low-Voltage Se Dec. 04, 2019

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