Valley Switching Flyback with 85 to 265VAC Input (48V @ 0.625A) Reference Design

(ACTIVE) PMP12027

Description & Features

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Key Document

Description

The PMP12027 reference design uses the UCC28740 flyback controller to generate a 48V/625mA output from a universal AC input.  The valley switching of the UCC28740 allows this design to achieve a maximum load efficiency over 90%; no load losses are less than 100mW. The constant current regulation mode of the UCC28740 provides accurate current limiting.

Features
  • Over 90% average 4 point efficiency
  • Standby (no load) power consumption is less than 100mW
  • Conducted emissions are below Class B levels
  • Accurate current limiting

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Schematic/Block Diagram

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Design Guide

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Design Files

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Bill of Materials (BOM)

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Parametrics
 PMP12027.1
(Output Voltage 1)
Vin (Min) (V)85
Vin (Max) (V)265
Vout (Nom) (V)48
Iout (Max) (A).625
Output Power (W)30
Isolated/Non-IsolatedIsolated
Input TypeAC
TopologyFlyback

TI Devices (2)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
TL431A  1% Accuracy Adjustable Precision Shunt Regulator  Voltage references  Sample & Buy Not Available
UCC28740  Constant-Voltage, Constant-Current Flyback Controller Using Opto-Coupler Feedback  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)
TL431A Download Download
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Download -
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UCC28740 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 2223 28 Mar 2016 6
Design files (3)
Title Abstract Type Size (KB) Date Views
PDF 132 28 Mar 2016 4
PDF 74 21 Mar 2016 3
PDF 103 21 Mar 2016 1 1

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