Primary-Side Regulated Flyback with 85 to 265VAC Input (12V @ 0.5A) Reference Design

(ACTIVE) PMP8787

Description & Features

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Key Document

Description

The PMP8787 reference design uses the UCC28700 flyback controller to generate a 12V/500mA output from a universal AC input. The primary-side regulation technique implemented by the UCC28700 eliminates the need for an opto coupler, reducing the size and cost of the design. In addition, the valley switching of the UCC28700 allows this design to achieve a maximum load efficiency over 80%; no load losses are less than 40mW. The circuit board measures only 28mm by 33mm, with a maximum height below 20mm.

Features
  • Primary Side Regulation (no optocoupler)
  • Standby (no load) power consumption is less than 40mW
  • Conducted emissions are below Class B levels
  • Compact form factor 28mm X 33mm X 20mm

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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
 PMP8787.1
(Output Voltage 1)
Vin (Min) (V)85
Vin (Max) (V)265
Vout (Nom) (V)12
Iout (Max) (A).5
Output Power (W)6
Isolated/Non-IsolatedIsolated
Input TypeAC
TopologyFlyback- Quasi Resonant
Flyback- DCM
Flyback- Non Sync

TI Devices (1)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
UCC28700  Constant-Voltage, Constant-Current PWM With Primary-Side Regulation  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)
UCC28700 Download Download

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Technical Documents

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User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 1995 21 Mar 2016 9
Design files (5)
Title Abstract Type Size (KB) Date Views
PDF 99 21 Mar 2016 8
PDF 87 21 Mar 2016 11
PDF 95 21 Mar 2016 2
PDF 229 10 Mar 2013 3
ZIP 166 10 Mar 2013 6

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