85 to 265VAC Input 12V/3W Low Cost Flyback with BJT Reference Design PMP20744 (ACTIVE)

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Key Document

Description

This 12V/3W reference design is optimized for very low cost and yet maintains good efficiency. Two key factors for minimizing cost are a BJT is used for the main power switch, and primary-side regulation (PSR) eliminates the need for an optocoupler. The UCC28720 quasi-resonant flyback controller is able to implement both of these features.

Features
  • Low cost BJT main switch
  • PSR eliminates cost of optocoupler and error amplifier
  • Conducted EMI data provided

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Schematic/Block Diagram

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Design Guide

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Design Files

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Parametrics
 PMP20744.1
(Output Voltage 1)
Vin (Min) (V)85
Vin (Max) (V)265
Vout (Nom) (V)12
Iout (Max) (A).4
Output Power (W)4.8
Isolated/Non-IsolatedIsolated
Input TypeAC
TopologyFlyback

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC28720  Constant-Voltage, Constant-Current Controller with Primary-Side Regulation for Bipolar Power Devices  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)
UCC28720 Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 2436 27 Feb 2017
Design files (5)
Title Type Size (KB) Date
ZIP 104 27 Feb 2017
PDF 480 27 Feb 2017
PDF 126 27 Feb 2017
PDF 68 27 Feb 2017
PDF 176 27 Feb 2017

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