36 to 75Vin 22V-32V/5A Output Active Clamp Forward Reference Design


Design files


This reference design generates a 28V/5A output from a 36V to 75V telecom input. The UCC2897A controls an active clamp forward converter power stage. The output is adjustable within a 22V to 32V range.  The UCC27511 is used to drive synchronous rectifiers, and provides for a highly efficient design. This design is laid out on a circuit board with pin placement that is compatible with a 1/4 brick footprint and achieves efficiencies over to 94%.  It uses only surface mount components, including ceramic output capacitors.

Output voltage options PMP9127.1
Vin (Min) (V) 36
Vin (Max) (V) 75
Vout (Nom) (V) 28
Iout (Max) (A) 5
Output Power (W) 140
Isolated/Non-Isolated Isolated
Input Type DC
Topology Forward- Active Clamp^Forward- Synchronous
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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.

SLUUAU6.PDF (5968 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

SLUC510.ZIP (229 K)

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.

Low-side drivers

UCC275114-A/8-A single-channel gate driver with 5-V UVLO, split outputs, and 13-ns Prop delay

Data sheet: PDF | HTML
PWM controllers

UCC2897A110-V active clamp current mode PWM controller with P-channel clamp FET and line OV protection

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
Test report PMP9127 Test Results Oct. 23, 2013

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