220V-400VDC Input, 12V/100W Active Clamp Forward Reference Design

(ACTIVE) PMP6961

Description & Features

Technical Documents

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Description

This reference design generates an isolated 12V/100W output from a high voltage DC input. This design is intended to operate from the output of a PFC front end regulator. The UCC2897A is used to control an active clamp forward converter. Self-driven synchronous rectifiers allow for over 91% efficiency. An accurate current limit is provided by directly sensing the output current. A clock pulse output is also provided for synchronizing with other converters.

Features
  • 220V-400VDC to 12V/8.333A Output (100W)
  • 91% efficiency
  • Ouput Current Sensing
  • Features UCC2897A Controller along with TI NexFET Synchronous Rectifiers
  • Active Clamp Forward Topology
  • Reduced conduction losses with synchronous rectifiers

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Schematic/Block Diagram

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Test Data

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Design Files

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Bill of Materials (BOM)

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Parametrics
 PMP6961.1
(Output Voltage 1)
Vin (Min) (V)220
Vin (Max) (V)400
Vout (Nom) (V)12
Iout (Max) (A)8.3
Output Power (W)99.6
Isolated/Non-IsolatedIsolated
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
CSD18531Q5A  60V N-Channel NexFET Power MOSFETs, CSD18531Q5A  MOSFETs  Sample & Buy View Design Kits & Evaluation Modules
SN74AHCT74  Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear and Preset  Flip-flop/latch/register  Sample & Buy Not Available
TL103WA  Dual OpAmp With Internal Reference  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TL431A  1% Accuracy Adjustable Precision Shunt Regulator  Voltage references  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)
CSD18531Q5A VSONP (DQJ)| 8 Download
SN74AHCT74 Download Download
Download Download
Download -
Download Download
Download Download
Download -
Download Download
TL103WA Download Download
TL431A Download Download
Download Download
Download -
Download Download
Download Download
Download Download
Download Download
Download -
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
PDF 2931 30 Mar 2012 7
Design files (4)
Title Abstract Type Size (KB) Date Views
ZIP 223 26 Feb 2014 6
PDF 380 30 Mar 2012 3
PDF 177 30 Mar 2012 21
PDF 83 30 Mar 2012 5

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