Home Energiemanagement AC/DC-Schaltregler AC/DC-Controller

UCC28720

AKTIV

Konstantspannungs- und Konstantstromregler mit primärseitiger Regelung für bipolare Stromversorgungs

Produktdetails

Topology Buck, Flyback Control mode Primary-side regulation Features CC/CV output regulation, Current limiting, DCM, Green mode, High-voltage startup, Input line monitor, Leading edge blanking, Light load efficiency, Low power, Overcurrent protection, Primary-side regulated, Quasi-Resonant, Soft start Duty cycle (max) (%) 99
Topology Buck, Flyback Control mode Primary-side regulation Features CC/CV output regulation, Current limiting, DCM, Green mode, High-voltage startup, Input line monitor, Leading edge blanking, Light load efficiency, Low power, Overcurrent protection, Primary-side regulated, Quasi-Resonant, Soft start Duty cycle (max) (%) 99
SOIC (D) 7 29.4 mm² (4.9 mm × 6 mm)
  • < 10-mW No-Load Power
  • Primary-Side Regulation (PSR) Eliminates Opto-
    Coupler
  • ±5% Voltage and Current Regulation Across Line
    and Load
  • 700-V Start-Up Switch
  • 80-kHz Maximum Switching Frequency Enables
    High-Power Density Charger Designs
  • Quasi-Resonant Valley-Switching Operation for
    Highest Overall Efficiency
  • Wide VDD Range Allows Small Bias Capacitor
  • Dynamic BJT Drive
  • Overvoltage, Low-Line, and Overcurrent
    Protection Functions
  • Programmable Cable Compensation
  • SOIC-7 Package
  • < 10-mW No-Load Power
  • Primary-Side Regulation (PSR) Eliminates Opto-
    Coupler
  • ±5% Voltage and Current Regulation Across Line
    and Load
  • 700-V Start-Up Switch
  • 80-kHz Maximum Switching Frequency Enables
    High-Power Density Charger Designs
  • Quasi-Resonant Valley-Switching Operation for
    Highest Overall Efficiency
  • Wide VDD Range Allows Small Bias Capacitor
  • Dynamic BJT Drive
  • Overvoltage, Low-Line, and Overcurrent
    Protection Functions
  • Programmable Cable Compensation
  • SOIC-7 Package

The UCC28720 flyback power supply controller provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.

An internal 700-V start-up switch, dynamically-controlled operating states and a tailored modulation profile support ultra-low standby power without sacrificing start-up time or output transient response.

Control algorithms in the UCC28720 allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a bipolar transistor power switch. Discontinuous conduction mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28720 allows compensation for voltage drop in the cable to be programmed with an external resistor.

The UCC28720 flyback power supply controller provides isolated-output Constant-Voltage (CV) and Constant-Current (CC) output regulation without the use of an optical coupler. The devices process information from the primary power switch and an auxiliary flyback winding for precise control of output voltage and current.

An internal 700-V start-up switch, dynamically-controlled operating states and a tailored modulation profile support ultra-low standby power without sacrificing start-up time or output transient response.

Control algorithms in the UCC28720 allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a bipolar transistor power switch. Discontinuous conduction mode (DCM) with valley switching reduces switching losses. Modulation of switching frequency and primary current peak amplitude (FM and AM) keeps the conversion efficiency high across the entire load and line ranges.

The controller has a maximum switching frequency of 80 kHz and always maintains control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28720 allows compensation for voltage drop in the cable to be programmed with an external resistor.

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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt UCC28720 Constant-Voltage, Constant-Current Controller With Primary-Side Regulation datasheet (Rev. B) PDF | HTML 30.09.2015
Anwendungshinweis Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips PDF | HTML 31.08.2021
Anwendungshinweis Minimize Standby Consumption for UCC287XX Family 01.08.2019
Anwendungshinweis Maximum Output Power and Thermal Considerations for UCC28720 and UCC28722 06.12.2017
Anwendungshinweis Troubleshooting TI PSR controllers 03.10.2016
Technischer Artikel Slim down your flyback; lose that excess snubber PDF | HTML 15.02.2016
Whitepaper Control Challenges for Low Power AC/DC Converters 02.10.2015
Whitepaper Control Challenges for Low Power AC/DC Converters (PPT) 02.10.2015
Technischer Artikel Designing multiple output converters with primary side sensing PDF | HTML 04.08.2015
Anwendungshinweis 5-W USB Flyback Design Example Using the UCC28722 08.01.2014

Design und Entwicklung

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