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

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(Output Voltage 1)
Vin (Min) (V)36
Vin (Max) (V)75
Vout (Nom) (V)28
Iout (Max) (A)5
Output Power (W)140
Input TypeDC
TopologyForward- Active Clamp
Forward- Synchronous

TI Devices (2)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC27511  4-A/8-A single-channel gate driver with 5-V UVLO, split outputs, and 13-ns Prop delay  Gate drivers  Sample & Buy Not Available
UCC2897A  110-V active clamp current mode PWM controller with P-channel clamp FET and line OV protection  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
UCC27511 Download Download
UCC2897A Download Download
Download Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 5902 23 Oct 2013
Design files (4)
Title Type Size (KB) Date
ZIP 229 23 Oct 2013
PDF 486 23 Oct 2013
PDF 81 23 Oct 2013
PDF 162 23 Oct 2013

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