98% Efficiency Analog 24V to 36V, 500W Backup and 50W Charger Reference Design for DC UPS


Design files


This analog, bidirectional power conversion reference design has a discharge or boost stage of 500 W and charge or buck stage of 50 W. This reference  design is made for 24-V battery pack and 30-V to 38-V bus voltage for use in DC-UPS, battery backup unit (BBU), local energy storage (LES) and DC/DC brick modules. The design’s high efficiency of >98% discharge and >95% charge optimizes the thermal management and extends battery backup time.

  • High efficiency of 98.3% peak and 97.4% at full load as backup power supply
  • Delivers high power output 20A, 30V as backup supply and charges battery at 2A during normal operation
  • Fast changeover in <500 μs from charging to backup supply mode enables fast power transfer during power failure
  • Compact solution with built-in heat sink (65 mm × 60 mm × 18 mm)
  • Typical efficiency of ≈ 95%, maximum efficiency of > 98.5%
  • Built-in analog solution for transition and CC-CV logic implemented reducing solution cost

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.

TIDUDL9.PDF (1017 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRUQ1.ZIP (1300 K)

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


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


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Boost controllers (external switch)

TPS43060Low Iq, 58V, Synchronous Boost Controller w/ Wide Input Voltage & 7.5V Gate Drive for Standard FETs

Data sheet document-pdfAcrobat PDF open-in-new HTML
Buck converters (integrated switch)

LMR14020SIMPLE SWITCHER, 4-V to 40-V, 2-A 2.2-MHz step-down converter with Low IQ

Data sheet document-pdfAcrobat PDF open-in-new HTML

LM293ADual precision standard comparator, extended temperature

Data sheet document-pdfAcrobat PDF open-in-new HTML
General-purpose op amps

LM358ADual, 30-V, 700-kHz, 3-mV offset voltage operational amplifier

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TLV704150-mA, 24-V, ultra-low-IQ, low-dropout voltage regulator

Data sheet document-pdfAcrobat PDF open-in-new HTML
N-channel MOSFETs

CSD18532KCS60-V, N channel NexFET™ power MOSFET, single TO-220, 4.2 mOhm

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide 98% Eff, All Analog, 24V to 36V, 500W Backup and 50W Charger Ref Des for DC UPS Dec. 14, 2017

Related design resources

Design tools & simulation

TINA-TI SPICE-based analog simulation program

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