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AC/DC 和 DC/DC 控制器 (外部 FET)

UCC28720

現行

具一次側調節的定電壓、定電流控制器，適合雙極電源裝置

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產品規格表

UCC28720

現行
產品規格表 立即訂購

產品詳細資料

Rating Catalog Topology Buck, Flyback Iout (max) (A) 3 Vin (max) (V) 450 Vin (min) (V) 9 Vout (max) (V) 20 Vout (min) (V) 3.3 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 Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 2000 Duty cycle (max) (%) 99
Rating Catalog Topology Buck, Flyback Iout (max) (A) 3 Vin (max) (V) 450 Vin (min) (V) 9 Vout (max) (V) 20 Vout (min) (V) 3.3 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 Operating temperature range (°C) -40 to 125 Iq (typ) (µA) 2000 Duty cycle (max) (%) 99
SOIC (D) 7 29.4 mm² 4.9 x 6
  • < 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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類型 標題 日期
* Data sheet UCC28720 Constant-Voltage, Constant-Current Controller With Primary-Side Regulation datasheet (Rev. B) PDF | HTML 2015年 9月 30日
Application note Flyback Aux Winding OVP and UVLO Fault Sensing Design and Troubleshooting Tips PDF | HTML 2021年 8月 31日
Application note Minimize Standby Consumption for UCC287XX Family 2019年 8月 1日
Application note Maximum Output Power and Thermal Considerations for UCC28720 and UCC28722 2017年 12月 6日
Application note Troubleshooting TI PSR controllers 2016年 10月 3日
Technical article Slim down your flyback; lose that excess snubber PDF | HTML 2016年 2月 15日
White paper Control Challenges for Low Power AC/DC Converters 2015年 10月 2日
White paper Control Challenges for Low Power AC/DC Converters (PPT) 2015年 10月 2日
Technical article Designing multiple output converters with primary side sensing PDF | HTML 2015年 8月 4日
Application note 5-W USB Flyback Design Example Using the UCC28722 2014年 1月 8日

設計與開發

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開發板

UCC28720EVM-212 — 適用於 USB 離線適配器的 UCC28720EVM-212 5W 評估模組

The UCC28720EVM-212 is a 5W evaluation module for evaluating an off line adapter for USB applications. It is intended for evaluation purposes and is not intended to be an end product. The UCC28720EVM-212 converters 100V to 240V RMS input voltage down to 5V DC, with a 1A current limit for USB (...)
使用指南: PDF
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計算工具

SLUC528 — UCC28722 MathCad Design Tool

支援產品和硬體

支援產品和硬體

產品
AC/DC 和 DC/DC 控制器 (外部 FET)
UCC28720 — 具一次側調節的定電壓、定電流控制器，適合雙極電源裝置 UCC28722 — 適用於雙極電源產品且具有一次側穩壓功能的低成本 CVCC 返馳控制器
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計算工具

SLUC529 — UCC28722 Excel Design Tool

支援產品和硬體

支援產品和硬體

產品
AC/DC 和 DC/DC 控制器 (外部 FET)
UCC28720 — 具一次側調節的定電壓、定電流控制器，適合雙極電源裝置 UCC28722 — 適用於雙極電源產品且具有一次側穩壓功能的低成本 CVCC 返馳控制器
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參考設計

PMP9622 — 350W 恆壓 - 定電流 (CVCC) 相移全橋參考設計

This reference design uses the UCC3895 Phase-Shifted Full Bridge controller to implement a high efficiency, 120VAC input to 44Vdc up to 8A output.  The power supply is set up to be  constant voltage-constant current.  The voltage and current are set by fixed resistor values and could (...)
Test report: PDF
電路圖: PDF
封裝 針腳 CAD 符號、佔位空間與 3D 模型
SOIC (D) 7 Ultra Librarian
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