UCC28704

現行

具有一次側穩壓 (PSR) 功能的高效率離線 CV 和 CC 返馳控制器

產品詳細資料

Vin (min) (V) 21 Vin (max) (V) 450 Iout (max) (A) 5 Operating temperature range (°C) -40 to 125 Control mode Primary-side regulation Topology Buck, Flyback Rating Catalog Vout (min) (V) 5 Vout (max) (V) 80 Features CC/CV output regulation, Cable compensation, DCM, NTC resistor interface, PSR, Primary-side regulated, Quasi-Resonant, Soft start, Valley switching Iq (typ) (µA) 2000 Duty cycle (max) (%) 99
Vin (min) (V) 21 Vin (max) (V) 450 Iout (max) (A) 5 Operating temperature range (°C) -40 to 125 Control mode Primary-side regulation Topology Buck, Flyback Rating Catalog Vout (min) (V) 5 Vout (max) (V) 80 Features CC/CV output regulation, Cable compensation, DCM, NTC resistor interface, PSR, Primary-side regulated, Quasi-Resonant, Soft start, Valley switching Iq (typ) (µA) 2000 Duty cycle (max) (%) 99
SOT-23 (DBV) 6 8.12 mm² 2.9 x 2.8
  • Efficiency Performance Exceeds DoE Level VI and EU CoC V5 Tier-2 External Power Supply Standards
  • Primary-Side Regulation Eliminates Opto-Coupler and Secondary Feedback Components
  • Compatible with Synchronous Rectifier
  • Enables <30-mW No-Load Input Power
  • ±5% Output Voltage (CV) and Current (CC) Regulation
  • Enhanced Dynamic Load Response
  • Constant Current Output Under-Voltage Protection (CCUV) with Auto-Restart Response
  • Cable Compensation (300 mV at 5-V Full Load)
  • 85-kHz Maximum Switching Frequency
  • DCM Valley-Switching Operation
  • Clamped Gate-Drive Output for MOSFET
  • NTC Resistor Interface
  • Resistor or External HV Depletion-Mode FET Start-Up
  • Fault Protections: Input Low Line, Output Over-Voltage, Over-Current, and Short-Circuit
  • SOT23-6 Package
  • Efficiency Performance Exceeds DoE Level VI and EU CoC V5 Tier-2 External Power Supply Standards
  • Primary-Side Regulation Eliminates Opto-Coupler and Secondary Feedback Components
  • Compatible with Synchronous Rectifier
  • Enables <30-mW No-Load Input Power
  • ±5% Output Voltage (CV) and Current (CC) Regulation
  • Enhanced Dynamic Load Response
  • Constant Current Output Under-Voltage Protection (CCUV) with Auto-Restart Response
  • Cable Compensation (300 mV at 5-V Full Load)
  • 85-kHz Maximum Switching Frequency
  • DCM Valley-Switching Operation
  • Clamped Gate-Drive Output for MOSFET
  • NTC Resistor Interface
  • Resistor or External HV Depletion-Mode FET Start-Up
  • Fault Protections: Input Low Line, Output Over-Voltage, Over-Current, and Short-Circuit
  • SOT23-6 Package

The UCC28704 Off-line flyback controller is a highly integrated, 6-pin primary-side regulated PWM controller for designing high efficiency AC-to-DC power supplies with low standby power consumption to comply with global efficiency standards. The controller has ultra-low current consumption at start-up to enable designs with <30-mW no-load input power and save standby mode energy consumption. Intelligent primary-side sensing and control enables 5% output voltage and current control without using an opto coupler or secondary-side feedback circuits.

UCC28704 incorporates an enhanced load transient response technique which helps minimize the output capacitor, reducing the overall system size and cost. The controller also eliminates the need for loop compensation components which simplify the design and debugging process for power supply designers. The converter output voltage and current is regulated to prevent overstress conditions that may damage the load or connectors. Similarly, the CCUV shutdown feature monitors for an output under voltage fault to protect connectors from over heat or burn out from soft shorts, which greatly enhance overall system reliability. Board or component over temperature protection is facilitated with an NTC interface pin.

UCC28704 can be readily used with TI secondary-side synchronous rectifier (SR) controllers at 2-A or higher output current levels for higher conversion efficiency or more compact designs.

For all available packages, see the orderable addendum at the end of the datasheet.

The UCC28704 Off-line flyback controller is a highly integrated, 6-pin primary-side regulated PWM controller for designing high efficiency AC-to-DC power supplies with low standby power consumption to comply with global efficiency standards. The controller has ultra-low current consumption at start-up to enable designs with <30-mW no-load input power and save standby mode energy consumption. Intelligent primary-side sensing and control enables 5% output voltage and current control without using an opto coupler or secondary-side feedback circuits.

UCC28704 incorporates an enhanced load transient response technique which helps minimize the output capacitor, reducing the overall system size and cost. The controller also eliminates the need for loop compensation components which simplify the design and debugging process for power supply designers. The converter output voltage and current is regulated to prevent overstress conditions that may damage the load or connectors. Similarly, the CCUV shutdown feature monitors for an output under voltage fault to protect connectors from over heat or burn out from soft shorts, which greatly enhance overall system reliability. Board or component over temperature protection is facilitated with an NTC interface pin.

UCC28704 can be readily used with TI secondary-side synchronous rectifier (SR) controllers at 2-A or higher output current levels for higher conversion efficiency or more compact designs.

For all available packages, see the orderable addendum at the end of the datasheet.

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類型 標題 日期
* Data sheet UCC28704 High-Efficiency Off-Line CV and CC Flyback Controller with Primary-Side Regulation (PSR) datasheet (Rev. A) PDF | HTML 2016年 2月 17日
Technical article 緩衝返馳式轉換器 PDF | HTML 2024年 3月 20日
Application brief Flyback Selection Guide PDF | HTML 2022年 6月 23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 Selecting Electrolitic Bus Capacitor for Universal Input 2018年 7月 17日
Technical article Making a solar inverter more reliable than the sun PDF | HTML 2017年 8月 1日
Technical article Powering the IoT PDF | HTML 2017年 1月 26日
Application note Design UCC28704 With UCC24636 (PSR+SR) 2017年 1月 12日
Technical article Biasing an SR controller IC in USB smartphone charging applications PDF | HTML 2016年 12月 8日
Technical article USB Type-C: charging a new world PDF | HTML 2016年 10月 4日
Application note Troubleshooting TI PSR controllers 2016年 10月 3日
Technical article USB chargers then and now: Type-C meets energy efficiency standards PDF | HTML 2016年 9月 23日
Technical article Keeping up with the standards: Efficiency and standby power requirements PDF | HTML 2016年 5月 12日
EVM User's guide Using the UCC28704EVM-724 10-W USB Adapter 2016年 1月 26日

設計與開發

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開發板

UCC28704EVM-724 — 適用於 USB 壁式轉接器且具有 PSR 功能的 UCC28704 5V/10W 離線電源評估模組

The UCC28704EVM-724 is a 10-W off-line isolated power supply providing 5-V output on a USB-A port. The converter output voltage and current are regulated to 5% accuracy without using an optocoupler or secondary-side feedback circuits. The EVM demonstrates a low-cost solution to comply with (...)

使用指南: PDF
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模擬型號

UCC28704 PSpice Transient Model

SLUM541.ZIP (88 KB) - PSpice Model
計算工具

SLUC603 UCC28704 Excel Design Calculator

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)
UCC28704 具有一次側穩壓 (PSR) 功能的高效率離線 CV 和 CC 返馳控制器
計算工具

SLUC605 UCC28704 MathCad Design Calculator

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)
UCC28704 具有一次側穩壓 (PSR) 功能的高效率離線 CV 和 CC 返馳控制器

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SOT-23 (DBV) 6 Ultra Librarian

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  • 進行中持續性的可靠性監測
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