48V-60VDC Input, 12V/250W Active Clamp Forward Reference Design

(ACTIVE) PMP9656

Description & Features

Technical Documents

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Key Document

Description

This reference design generates a 12V/21A output from 54V DC input. The UCC2897A controls an active clamp forward converter power stage. The low gate charge and low RDSon of the CSD18532Q5B, implemented as self-driven synchronous rectifiers, allow this design to achieve a max load efficiency of nearly 96%.  The compact UCC27511 drivers simplify the gate drive circuitry for the synchronous rectifiers.

Features
  • Over 95% efficiency at max load
  • 89% efficiency at 10% load
  • Low output ripple
  • Self-driven synchronous rectifiers (using CSD18532Q5B MOSFETs) reduce drive complexity
  • Generates regulated 12V bus for telecom or server applications
  • Low profile, less than 14mm max component height

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Schematic/Block Diagram

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Design Files

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Bill of Materials (BOM)

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Parametrics
 PMP9656.1
(Output Voltage 1)
Vin (Min) (V)48
Vin (Max) (V)60
Vout (Nom) (V)12
Iout (Max) (A)21
Output Power (W)252
Isolated/Non-IsolatedIsolated
Input TypeDC
TopologyForward- Active Clamp
Forward- Synchronous

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
CSD18532Q5B  60-V, N-Channel NexFET™ Power MOSFET  MOSFETs  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)
CSD18532Q5B VSON-CLIP (DNK)| 8 Download -
UCC27511 Download Download
UCC2897A Download Download
Download -

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Technical Documents

View the Important Notice for TI Designs covering authorized use, intellectual property matters and disclaimers.

User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 2540 16 Oct 2014 8
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 797 15 May 2018 2
ZIP 807 15 May 2018 5
PDF 162 15 May 2018 21
PDF 724 15 May 2018 3
PDF 103 15 May 2018 3
PDF 84 16 Oct 2014 5

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