High voltage 800-W SEPIC converter reference design for server battery backup charging


Design files


This discontinuous conduction mode (DCM) non-isolated 800-W SEPIC converter battery charger reference design provides an adjustable output voltage and current. The output voltage can be adjusted from 282 V to 400 V by setting an external DC voltage between 0 V to 3 V. The output charging current can be adjusted between 0 A to 2 A by adjusting the duty cycle of a PWM input. It operates over an input voltage range of 340 Vdc to 420 Vdc. Independent voltage and current feedback loops are used to maintain regulation.

  • High efficiency of 97 % at 800 W (380 Vin, 400 Vout at 2 A)
  • Accurate voltage (1 %) and current (2 %) regulation
  • Easily interfaced with DAC or microprocessor or can be manually controlled
  • SiC FET and rectifier minimize ringing and switching losses
  • Compact PCB size (116 mm x 95 mm)
Output voltage options PMP22339.1
Vin (Min) (V) 340
Vin (Max) (V) 420
Vout (Nom) (V) 400
Iout (Max) (A) 2
Output Power (W) 800
Isolated/Non-Isolated Non-Isolated
Input Type DC
Topology Sepic- DCM
Enterprise systems
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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.

TIDM898.PDF (310 K)

Detailed schematic diagram for design layout and components

TIDM899.PDF (132 K)

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

TIDM900.PDF (330 K)

Detailed overview of design layout for component placement

TIDM902.ZIP (2155 K)

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

TIDCG16.ZIP (963 K)

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

TIDM901.PDF (1556 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
* User guide High-Voltage, 800-W SEPIC Converter Reference Design for Server Battery Backup C PDF | HTML Jul. 06, 2021

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