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AC/DC 和 DC/DC 控制器 (外部 FET)

UCC28702

現行

具 PSR、NTC 選項和 150mV 纜線補償的定電壓、定電流 PWM

立即訂購
產品規格表

UCC28702

現行
產品規格表 立即訂購

產品詳細資料

Operating temperature range (°C) -20 to 125 Control mode Primary-side regulation Topology Buck, Flyback Rating Catalog Features CC/CV output regulation, Cable compensation, DCM, Leading edge blanking, NTC resistor interface, Overcurrent protection, PSR, Primary-side regulated, Quasi-Resonant, Soft start, Valley switching Duty cycle (max) (%) 99
Operating temperature range (°C) -20 to 125 Control mode Primary-side regulation Topology Buck, Flyback Rating Catalog Features CC/CV output regulation, Cable compensation, DCM, Leading edge blanking, NTC resistor interface, Overcurrent protection, PSR, Primary-side regulated, Quasi-Resonant, Soft start, Valley switching Duty cycle (max) (%) 99
SOT-23 (DBV) 6 8.12 mm² 2.9 x 2.8
  • < 30-mW No-Load Power for 5-Star Rating
  • Primary-Side Regulation (PSR) Eliminates Opto-Coupler
  • ±5% Voltage and Current Regulation
  • 130-kHz Maximum Switching Frequency Enables High-Power
    Density Charger Designs
  • Quasi-Resonant Valley-Switching Operation for Highest
    Overall Efficiency
  • Patent-Pending Frequency-Jitter Scheme to Ease EMI
    Compliance
  • Wide VDD Range Allows Small Bias Capacitor
  • Clamped Gate-Drive Output for MOSFET
  • Protection Functions: Overvoltage, Low-Line, and
    Overcurrent
  • Programmable Cable Compensation (UCC28700 Only)
  • NTC Resistor Interface (UCC28701, UCC28702 and UCC28703
    Only) With Fixed Cable Compensation Options
  • SOT-23 Package
  • < 30-mW No-Load Power for 5-Star Rating
  • Primary-Side Regulation (PSR) Eliminates Opto-Coupler
  • ±5% Voltage and Current Regulation
  • 130-kHz Maximum Switching Frequency Enables High-Power
    Density Charger Designs
  • Quasi-Resonant Valley-Switching Operation for Highest
    Overall Efficiency
  • Patent-Pending Frequency-Jitter Scheme to Ease EMI
    Compliance
  • Wide VDD Range Allows Small Bias Capacitor
  • Clamped Gate-Drive Output for MOSFET
  • Protection Functions: Overvoltage, Low-Line, and
    Overcurrent
  • Programmable Cable Compensation (UCC28700 Only)
  • NTC Resistor Interface (UCC28701, UCC28702 and UCC28703
    Only) With Fixed Cable Compensation Options
  • SOT-23 Package

The UCC28700 family of flyback power supply controllers provides 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. Low start-up current, dynamically controlled operating states and a tailored modulation profile support very low standby power without sacrificing start-up time or output transient response.

Control algorithms in the UCC28700 family allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a MOSFET 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 controllers have a maximum switching frequency of 130 kHz and always maintain control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28700 allows the level of cable compensation to be programmed. The UCC28701, UCC28702, and UCC28703 devices allow remote temperature sensing using a Negative Temperature Coefficient (NTC) resistor while providing fixed cable-compensation levels.

The UCC28700 family of flyback power supply controllers provides 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. Low start-up current, dynamically controlled operating states and a tailored modulation profile support very low standby power without sacrificing start-up time or output transient response.

Control algorithms in the UCC28700 family allow operating efficiencies to meet or exceed applicable standards. The output drive interfaces to a MOSFET 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 controllers have a maximum switching frequency of 130 kHz and always maintain control of the peak-primary current in the transformer. Protection features help keep primary and secondary component stresses in check. The UCC28700 allows the level of cable compensation to be programmed. The UCC28701, UCC28702, and UCC28703 devices allow remote temperature sensing using a Negative Temperature Coefficient (NTC) resistor while providing fixed cable-compensation levels.
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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 This product is a newer PSR flyback controller with better performance and meets the latest energy efficiency standards. It is suggested for new designs.

技術文件

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類型 標題 日期
* Data sheet UCC2870x Constant-Voltage, Constant-Current Controller With Primary-Side Regulation datasheet (Rev. A) PDF | HTML 2014年 12月 12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
Selection guide Power Management Guide 2018 (Rev. R) 2018年 6月 25日
Application note Troubleshooting TI PSR controllers 2016年 10月 3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
Application note UCC28700 5-W USB Flyback Design Review (Rev. C) 2014年 2月 21日
More literature Exposing the Inner Behavior of a Quasi-Resonant Flyback Converter 2013年 10月 29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

UCC28700EVM-068 — UCC28700 評估模組

The Texas Instruments UCC28700EVM-068 evaluation module (EVM) helps designers evaluate the performance of the UCC28700 Constant-Voltage, Constant-Current PWM with Primary-Side Regulation. The 5W EVM is used for evaluating an off line adapter for USB applications. It converts a 90V to 265V RMS (...)
使用指南: PDF
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模擬型號

UCC2870x PSPICE Transient Model

SLUM455.ZIP (131 KB) - PSpice Model
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模擬型號

UCC2870x TINA-TI Transient Reference Design

SLUM619.TSC (195 KB) - TINA-TI Reference Design
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模擬型號

UCC2870x TINA-TI Transient Spice Model

SLUM617.ZIP (101 KB) - TINA-TI Spice Model
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計算工具

SLUC381 — 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)
UCC28700 — 具 PSR 和可編程纜線補償的定電壓、定電流 PWM UCC28700-Q1 — 具汽車級的小型一次側調節 PWM 控制器 UCC28701 — 具 PSR、NTC 選項和 0 mV 纜線補償的定電壓、定電流 PWM UCC28702 — 具 PSR、NTC 選項和 150mV 纜線補償的定電壓、定電流 PWM UCC28703 — 具 PSR、NTC 選項和 300mV 纜線補償的定電壓、定電流 PWM
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計算工具

SLUC408 — UCC28700 Excel 97 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)
UCC28700 — 具 PSR 和可編程纜線補償的定電壓、定電流 PWM UCC28700-Q1 — 具汽車級的小型一次側調節 PWM 控制器 UCC28701 — 具 PSR、NTC 選項和 0 mV 纜線補償的定電壓、定電流 PWM UCC28702 — 具 PSR、NTC 選項和 150mV 纜線補償的定電壓、定電流 PWM UCC28703 — 具 PSR、NTC 選項和 300mV 纜線補償的定電壓、定電流 PWM
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SOT-23 (DBV) 6 Ultra Librarian
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  • 認證摘要
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