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AC/DC & DC/DC controllers (external 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

立即訂購
產品規格表

UCC28720

現行
產品規格表 立即訂購

產品詳細資料

Vin (min) (V) 9 Vin (max) (V) 450 Iout (max) (A) 3 Operating temperature range (°C) -40 to 125 Control mode Primary-side regulation Topology Buck, Flyback Rating Catalog Vout (min) (V) 3.3 Vout (max) (V) 20 Iq (typ) (A) 0.002 Duty cycle (max) (%) 99
Vin (min) (V) 9 Vin (max) (V) 450 Iout (max) (A) 3 Operating temperature range (°C) -40 to 125 Control mode Primary-side regulation Topology Buck, Flyback Rating Catalog Vout (min) (V) 3.3 Vout (max) (V) 20 Iq (typ) (A) 0.002 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
EVM User's guide Using the UCC28720EVM-212 (Rev. A) 2013年 9月 20日

設計與開發

如需其他條款或必要資源，請按一下下方的任何標題以檢視詳細頁面 (如有)。

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 & DC/DC controllers (external 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
下載
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 & DC/DC controllers (external 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

PMP20744 — 具有 BJT 的 85V 至 265V AC 輸入、12V/3W 低成本返馳參考設計

This 12V/3W reference design is optimized for very low cost and yet maintains good efficiency. Two key factors for minimizing cost are a BJT is used for the main power switch, and primary-side regulation (PSR) eliminates the need for an optocoupler. The UCC28720 quasi-resonant flyback controller (...)
Test report: PDF
電路圖: PDF
參考設計

PMP8678 — 高電壓輸入 (184Vac…707Vac) 至 12V@1A、3.3V@100mA 非隔離返馳參考設計

The UCC28720 is a quasi resonant controller and is specialized to drive high voltage BJTs. When the drain voltage is higher than 1KV, BJTs are the best choice for low to mid power flyback converters. In this case two voltages are supplied: 12V@1A and 3.3V@100mA.
Test report: PDF
電路圖: PDF
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
參考設計

PMP9649 — 使用 UCC28720 的通用線路輸入 AC-DC 3W 高壓側降壓轉換器參考設計

The PMP9649 reference design is a simple, low-cost high side Buck converter to convert universal AC input voltage (85Vac to 265Vac) to a non-isolated 20V/150mA DC output with UCC28720 controller. BJT is applied as the buck switch for cost optimization, and simplicity is achieved with bulit-in (...)
Test report: PDF
電路圖: PDF
參考設計

PMP9243 — 適用於最高達 583VAC 之工業 AC 輸入且具有雙極電晶體的一次側穩壓返馳參考設計

The PMP9243 reference design uses the UCC28720 primary-side regulated flyback controller to generate a 15V/0.25A output from an industrial AC input (up to 583VAC). A bipolar transistor is used as the switch on the primary side to minimize the circuit cost.
Test report: PDF
參考設計

PMP9517 — 小體積 10W 離線返馳電源參考設計

The PMP9517 is a high density constant voltage / constant current power supply with an 85VAC-265VAC input range and 5V/10W outptut. The design features primary side regulation (PSR) of a low cost power transistor (BJT). With low component count and low cost, the design is suitable for USB type (...)
Test report: PDF
電路圖: PDF
參考設計

PMP9135 — 具有 BJT 的 85V 至 265V AC 輸入、5V/10W 低成本返馳參考設計

Constant Voltage/Constant Current  power supply generates 5V at 2A output. The design features primary side regulation (PSR) of a power transistor (BJT). With a low component count and low cost, the design can be use in USB type power supplies for PDA's, tablets, cameras and cell phones.
Test report: PDF
電路圖: PDF
參考設計

PMP9235 — 具有 BJT 開關的 120V AC 輸入 5V/250mA 返馳式轉換器參考設計

This reference design creates a 5V at 250mA from a 120VAC Input. The UCC28720 primary side controller with a BJT power switch provides a low cost design. It is important to note the outputs are only functionally (not for safety) isolated from the input.
Test report: PDF
參考設計

PMP9059 — 具有 BJT 開關的 120V AC 輸入 5V/200mA 返馳式轉換器參考設計

This reference design creates a 5V at 200mA from a 120VAC Input. This supply is to designed to fit into a very small volume with approximately 10mm total height. The UCC28720 primary side controller with a BJT power switch provides a low cost design. A TPS71433 is also used to provide an (...)
Test report: PDF
參考設計

PMP9044 — 具有雙極電晶體且適用於通用 3 相 AC 輸入的一次側穩壓返馳參考設計

The PMP9044 reference design uses the UCC28720 primary-side regulated flyback controller to generate a 3.3V/0.5A output from a 3-phase univeral AC input. A bipolar transistor is used as the switch on the primary side to minimize the circuit cost.
Test report: PDF
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