High efficiency, ultra-wide input (20 VDC to 375 VDC) isolated power supply reference design


Design files


This reference design uses the UCC28C42 boost controller and the UCC28780 active-clamp flyback controller to generate an isolated output of 24 V at 3.5 A over an ultra-wide input voltage range of 20 V to 375 V. The design also uses the UCC24612 synchronous rectifier controller on the secondary side. Zero voltage switching (ZVS) ensures high efficiency over a wide operating range.                                                                                  

  • Zero voltage switching (ZVS) provides high efficiency (94% peak value)
  • Two-stage power supply allows an extremely wide input range (20 V to 375 V)
  • Adaptive burst-mode feature maintains high efficiency even at light loads
  • Synchronous rectifier using drain-to-source voltage sensing
Output voltage options PMP30720.1
Vin (Min) (V) 20
Vin (Max) (V) 375
Vout (Nom) (V) 24
Iout (Max) (A) 3.5
Output Power (W) 84
Isolated/Non-Isolated Isolated
Input Type DC
Topology Buck- Non Sync^Flyback- Active Clamp

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.

TIDT143.PDF (2692 K)

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

TIDM265.PDF (433 K)

Detailed schematic diagram for design layout and components

TIDM266.PDF (48 K)

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

TIDM267.PDF (53 K)

Detailed overview of design layout for component placement

TIDM269.ZIP (1494 K)

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

TIDCFN9.ZIP (1465 K)

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

TIDM268.PDF (101 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC287801-MHz High Frequency Active Clamp Flyback Controller

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Half-bridge drivers

UCC277121.8-A/2.8-A, 620V half bridge driver with interlock

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PWM controllers

UCC28C4220V, 1-A, BiCMOS Low current 8 pin PWM current mode controller

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SR & load share controllers

UCC24612High-frequency multi-mode synchronous rectifier controller

Data sheet document-pdfAcrobat PDF open-in-new HTML
Shunt voltage references

ATL431LILow-IQ programmable shunt regulator offered in an ultra-small DQN package

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Technical documentation

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Type Title Date
* Test report High Efficiency, Ultra-Wide Input Isolated Power Supply Reference Design Oct. 16, 2019

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