UCC28740EVM-525 Evaluation Module
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The UCC28740EVM-525 evaluation module is a 10W off-line discontinuous mode (DCM) flyback converter that provides constant-voltage (CV) and constant-current (CC) output regulation. It uses optical coupler feedback for tight voltage regulation and improved the transient response to large load steps and primary side control for accurate constant current regulation. The UCC28740 controller uses frequency modulation, peak primary current modulation, valley switching and valley skipping in its control algorithm in order to maximize efficiency over the entire operating range.

  • Universal AC input, 5V/2.1A output
  • <20mW no load power
  • Avg. efficiency > 80%
  • Opto-Coupled Feedback for Constant Voltage Regulation and Fast Dynamic Response
  • Primary Side Control for Tight Constant Current Performance (± 5% Output Current Regulation)
  • Internal 700V Start-Up Switch to Start up the Supply Directly From the Bulk Rail
  • Quasi-resonant valley switching operation for highest overall efficiency
  • Protection Functions: Over Voltage, Low Line, Over Current and Short circuit

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UCC28740EVM-525 Evaluations Module


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Technical documentation
User guides (1)
Title Type Size (KB) Date
PDF 1432 02 Jul 2013
More literature (1)
Title Type Size (KB) Date
PDF 38 02 Jan 2019

Hardware development (2)

Name Part Number Tool Type
LM5023 19V 65W Notebook Adapter Evaluation Module  LM5023-2NBEVM  Evaluation boards 
UCC28711 evaluation module  UCC28711EVM-160  Evaluation boards 

TI Devices (5)

Part Number Name Product Family
LM5023  AC-DC quasi-Resonant current mode PWM controller  Offline & isolated DC/DC controllers & converters 
UCC28710  Constant-voltage, constant-current PWM with PSR, valley switching & Programmable cable compensation  Offline & isolated DC/DC controllers & converters 
UCC28711  Constant-voltage, constant-current PWM with PSR, valley switching, NTC option, and 0-mV cable comp.  Offline & isolated DC/DC controllers & converters 
UCC28740  Constant-voltage, constant-current Flyback controller Using Opto-Coupler Feedback  Offline & isolated DC/DC controllers & converters 
UCC28740-Q1  Automotive ultra low standby, flyback controller with integrated HV startup and optocoupler feedback  Offline & isolated DC/DC controllers & converters 

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