350W Constant Voltage - Constant Current (CVCC) Phase-Shifted Full Bridge reference design


Design files


This reference design uses the UCC3895 Phase-Shifted Full Bridge controller to implement a high efficiency, 120VAC input to 44Vdc up to 8A output.  The power supply is set up to be  constant voltage-constant current.  The voltage and current are set by fixed resistor values and could be set by micro-processor in the actual product.  The design is biased by a low-cost BJT Flyback using the UCC28720 PWM controller.

  • 120Vac input, 44Vdc @ 2-8A output
  • >92% efficiency achieved @ 8A
  • High-side Gate Drive Tranformers used for lowest cost implementation.
  • Low-cost BJT flyback used for design bias
  • Flexible setting of Voltage and Current levels by fixed resistor values or micro-processor in real design 
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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.

TIDU844.PDF (418 K)

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


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

TIDC965.ZIP (598 K)

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


Includes TI products in the design and potential alternatives.

Flyback controllers

UCC28720Constant-voltage, constant-current controller with primary-side regulation for bipolar power devices

Data sheet: PDF | HTML
General-purpose op amps

TLC272Dual, 16-V, 2-MHz, In to V- operational amplifier

Data sheet: PDF
Low-side drivers

UCC373244-A/4-A dual-channel gate driver with non-inverting inputs

Data sheet: PDF | HTML
PWM controllers

UCC3895Phase-shifted full-bridge controller with enhanced control logic, 0°C to 70°C

Data sheet: PDF | HTML
Precision op amps (Vos<1mV)

OPA376Precision (0.025mV), low noise (7.5nV/rtHz), low quiescent current (760uA) op amp

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Test report PMP9622 Test Results Mar. 12, 2015

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