36 to 75VDC Input 5V/15A Active Clamp Forward 1/8 Brick Form Factor Reference Design PMP9126 (ACTIVE)

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This reference design generates a 5V/15A output from a 36V to 75V telecom input. The UCC2897A controls an active clamp forward converter power stage. The low gate charge and low RDSon of the CSD17501Q5A and CSD18502Q5B, implemented as a synchronous rectifiers, provides for a highly efficient design. This design is laid out in a standard eighth brick footprint and achieves efficiencies up to 94%.  It uses only surface mount components, including ceramic output capacitors.

  • 36V to 75VDC input 5V/15A output
  • 94% efficiency
  • Industry Standard Eighth Brick Footprint
  • Features UCC2897A Controller along with TI NexFET Synchronous Rectifiers
  • Active Clamp Forward Topology
  • Reduced conduction losses and die area of the synchronous rectifiers

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Design Files

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(Output Voltage 1)
Vin (Min) (V)36
Vin (Max) (V)75
Vout (Nom) (V)5
Iout (Max) (A)15
Output Power (W)75
Input TypeDC
TopologyForward- Active Clamp
Forward- Synchronous

TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD17501Q5A  30V, N-Channel NexFET™ Power MOSFET with 20 Volt Vgs  MOSFETs  Not Available View Design Kits & Evaluation Modules
CSD18502Q5B  40V, N ch NexFET MOSFET™, single SON5x6, 2.3mOhm  MOSFETs  Sample & Buy Not Available
TLV431A  1% Accuracy Low-Voltage Adjustable Precision Shunt Regulator  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
UCC27511  4A/8A Single Channel High-speed Low-side Gate Driver  Gate drivers  Sample & Buy Not Available
UCC2897A  Advanced Current-Mode Active Clamp PWM Controller  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)
CSD17501Q5A VSONP (DQJ)| 8 Download Download
CSD18502Q5B VSON-CLIP (DNK)| 8 Download
TLV431A Download Download
Download Download
Download -
Download Download
Download -
Download Download
UCC27511 Download Download
UCC2897A Download Download
Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 2162 22 Oct 2013
Design files (4)
Title Type Size (KB) Date
ZIP 213 22 Oct 2013
PDF 384 22 Oct 2013
PDF 82 22 Oct 2013
PDF 144 22 Oct 2013

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