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UCC28740 - Constant-Current Flyback Controller

General Description

The UCC28740 isolated-flyback power-supply controller provides Constant-Voltage (CV) using an optical coupler to improve transient response to largeload steps.

Constant-Current (CC) regulation is accomplished through Primary-Side Regulation (PSR) techniques.

Key Features

  • 1 Less than 10-mW No-Load Power Capability.
  • Optocoupled Feedback for CV, and Primary-Side Regulation (PSR) for CC.
  • Enables ±1% Voltage Regulation and ±5% Current Regulation Across Line and Load.
  • 700-V Startup Switch.
  • 100-kHz Maximum Switching Frequency Enables High-Power-Density Charger Designs.
  • Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency.
  • Frequency Dithering to Ease EMI Compliance.
  • Clamped Gate-D.

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Full PDF Text Transcription for UCC28740 (Reference)

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Product Folder Order Now Technical Documents Tools & Software Support & Community UCC28740 SLUSBF3D – JULY 2013 – REVISED MARCH 2018 UCC28740 Constant-Voltage Constant-Cu...

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– JULY 2013 – REVISED MARCH 2018 UCC28740 Constant-Voltage Constant-Current Flyback Controller Using Optocoupled Feedback 1 Features •1 Less than 10-mW No-Load Power Capability • Optocoupled Feedback for CV, and Primary-Side Regulation (PSR) for CC • Enables ±1% Voltage Regulation and ±5% Current Regulation Across Line and Load • 700-V Startup Switch • 100-kHz Maximum Switching Frequency Enables High-Power-Density Charger Designs • Resonant-Ring Valley-Switching Operation for Highest Overall Efficiency • Frequency Dithering to Ease EMI Compliance • Clamped Gate-Drive Output for MOSFET • Overvoltage, Low-Line, and Overcurre

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