Compact, efficient, 24-V input auxiliary power supply reference design for servo drives


Design files


This reference design showcases a method to generate power supplies required in a servo or AC drive including the analog and digtal I/O interfaces, encoder supply, isolated transceivers and digital processing block. This design also implements protection against input reverse polarity, output overload and short circuit conditions.

  • Powered from an external protective extra-low voltage (PELV) power supply of 24 V ±20%
  • Industrial eFuse at supply input providing programmable UV/OV, reverse polarity protection, output overload and SC protection
  • Synchronous buck DC/DC converter with integrated switch optimized for >90% efficiency and compact size
  • PSR flyback with integarted switch to generate isolated voltage rails for communication and digital I/Os
  • Programmable voltage output to support multiple encoder types
  • Output voltage rails: 24 VISO, 5 VISO, ±12 V, 5 V, 3.3 V, 2.5 V, 1.2 V with load and line regulation of <±1%
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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.

TIDUED0.PDF (8910 K)

Reference design overview and verified performance test data

TIDRZ25.PDF (479 K)

Detailed schematic diagram for design layout and components

TIDRZ26.PDF (208 K)

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

TIDRZ27.PDF (298 K)

Detailed overview of design layout for component placement

TIDRZ29.ZIP (2752 K)

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

TIDCFB1.ZIP (4145 K)

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

TIDRZ28.PDF (1663 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Boost converters (integrated switch)

TPS611701.2A Switch, 38V High Voltage Boost Converter in 2x2mm QFN Package

Data sheet: PDF | HTML
Buck converters (integrated switch)

LMR33630SIMPLE SWITCHER® 3.8V to 36V, 3A Synchronous Buck Converter With Ultra-Low EMI

Data sheet: PDF | HTML
Buck converters (integrated switch)

TLV625692.5V-5.5V input, 2-A high efficiency step-down buck converter in SOT23 and SOT563 package

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS621253V-17V, 300mA Buck Converter With Adjustable Enable Threshold And Hysteresis

Data sheet: PDF | HTML
Buck converters (integrated switch)

TPS628212.4-V to 5.5-V input, 1-A step-down converter with 1% accuracy in 1.5-mm x 2-mm VSON-HR package

Data sheet: PDF | HTML
Isolated DC/DC converters & modules

LM5180-Q1Automotive 65-VIN no-opto flyback converter with 100-V, 1.5-A integrated MOSFET

Data sheet: PDF | HTML
Linear & low-dropout (LDO) regulators

LP2951-N100-mA, 30-V, low-dropout voltage regulator with power good & enable

Data sheet: PDF | HTML
N-channel MOSFETs

CSD16301Q225-V, N channel NexFET™ power MOSFET, single SON 2 mm x 2 mm, 29 mOhm

Data sheet: PDF | HTML
N-channel MOSFETs

CSD19533Q5A100-V, N channel NexFET™ power MOSFET, single SON 5 mm x 6 mm, 9.5 mOhm

Data sheet: PDF | HTML

LM38803 Rail Simple Power Sequencer with Fixed Time Delay

Data sheet: PDF
eFuses & hot swap controllers

TPS252002.5-V to 6.5-V, 60mΩ, 0.085-2.9A eFuse with reverse current blocking when off

Data sheet: PDF | HTML
eFuses & hot swap controllers

TPS26634.5-V to 60-V, 31mΩ, 0.6-6A eFuse with output power limiting and surge protection

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Compact, efficient, 24-V input auxiliary power supply reference design for servo Feb. 22, 2019

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