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UCC28720

ACTIVO

Controlador de corriente y tensión constantes con regulación del lado primario para dispositivos de

Detalles del producto

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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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos UCC28720 Constant-Voltage, Constant-Current Controller With Primary-Side Regulation datasheet (Rev. B) PDF | HTML 30/09/2015
Nota sobre la aplicación Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips PDF | HTML 31/08/2021
Nota sobre la aplicación Minimize Standby Consumption for UCC287XX Family 1/08/2019
Nota sobre la aplicación Maximum Output Power and Thermal Considerations for UCC28720 and UCC28722 6/12/2017
Nota sobre la aplicación Troubleshooting TI PSR controllers 3/10/2016
Artículo técnico Slim down your flyback; lose that excess snubber PDF | HTML 15/02/2016
Informe Control Challenges for Low Power AC/DC Converters 2/10/2015
Informe Control Challenges for Low Power AC/DC Converters (PPT) 2/10/2015
Artículo técnico Designing multiple output converters with primary side sensing PDF | HTML 4/08/2015
Nota sobre la aplicación 5-W USB Flyback Design Example Using the UCC28722 8/01/2014

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Placa de evaluación

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