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

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Evaluation board

UCC28740EVM-525 – UCC28740EVM-525 Evaluations Module

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Technical documentation

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Type Title Date
More literature UCC28740EVM-525 EU Declaration of Conformity (DoC) Jan. 02, 2019
User guide Using the UCC28740EVM-525 Jul. 02, 2013

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