Offline supercapacitor backup power supply with active cell balancing reference design


Design files


This reference design provides a backup voltage during a power interruption. It manages the charging of supercapacitors directly from the mains voltage (96 VAC - 272 VAC). The UCC28740 provides constant-voltage (CV) and constant-current (CC) output regulation. The supercapacitor capacitance and voltage define the energy that is available for the backup.

  • Electric double-layer capacitor charger
  • Protection functions: over voltage, low line, over current and short circuit 
  • Active cell balancing
  • Complete tested design with available design files and test report
Output voltage options PMP30826.1
Vin (Min) (V) 96
Vin (Max) (V) 272
Vout (Nom) (V) 4
Iout (Max) (A) 3
Output Power (W) 12
Isolated/Non-Isolated Isolated
Input Type AC
Topology Flyback- Quasi Resonant
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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.

TIDT170.PDF (3128 K)

Test results for the reference design, including efficiency graphs, test prerequisites and more

TIDM522.PDF (234 K)

Detailed schematic diagram for design layout and components

TIDM523.PDF (68 K)

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

TIDM524.PDF (139 K)

Detailed overview of design layout for component placement

TIDM526.ZIP (1783 K)

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


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

TIDM525.PDF (167 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28740Constant-Voltage, Constant-Current (CVCC) Flyback controller with Secondary Side Regulation (SSR)

Data sheet: PDF | HTML
Charge pumps (inductorless)

LM276550-kHz switched capacitor voltage doubler

Data sheet: PDF | HTML
Shunt voltage references

LMV431A1%, low-voltage (1.24-V) adjustable precision shunt regulator

Data sheet: PDF

Technical documentation

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Type Title Date
* Test report Offline Supercapacitor Backup Power Supply Reference Design Mar. 27, 2020
More literature A supercapacitor and battery backup power-supply design PPT Dec. 02, 2021

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