ZHCSEK1B December   2013  – October 2015 UCC28722

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Device Bias Voltage Supply (VDD)
      2. 7.3.2 Ground (GND)
      3. 7.3.3 Voltage-Sense (VS)
      4. 7.3.4 Base Drive (DRV)
      5. 7.3.5 Current Sense (CS)
        1. 7.3.5.1 Example
      6. 7.3.6 Cable Compensation (CBC)
    4. 7.4 Device Functional Modes
      1. 7.4.1 Primary-Side Voltage Regulation
      2. 7.4.2 Primary-Side Current Regulation
      3. 7.4.3 Valley Switching
      4. 7.4.4 Start-Up Operation
      5. 7.4.5 Fault Protection
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Stand-by Power Estimate
        2. 8.2.2.2 Input Bulk Capacitance and Minimum Bulk Voltage
        3. 8.2.2.3 Transformer Turns Ratio, Inductance, Primary-Peak Current
        4. 8.2.2.4 Transformer Parameter Verification
        5. 8.2.2.5 Output Capacitance
        6. 8.2.2.6 VDD Capacitance, CDD
        7. 8.2.2.7 VS Resistor Divider, Line Compensation, and Cable Compensation
        8. 8.2.2.8 Startup Resistance and Startup Time
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 器件支持
      1. 11.1.1 器件命名规则
        1. 11.1.1.1 术语定义
          1. 11.1.1.1.1  法拉电容术语
          2. 11.1.1.1.2  占空比术语
          3. 11.1.1.1.3  频率术语（以赫兹为单位）
          4. 11.1.1.1.4  电流术语（以安培为单位）
          5. 11.1.1.1.5  电流和电压调节术语
          6. 11.1.1.1.6  变压器术语
          7. 11.1.1.1.7  功率术语（以瓦特为单位）
          8. 11.1.1.1.8  电阻术语（以 Ω 为单位）
          9. 11.1.1.1.9  时序术语（以秒为单位）
          10. 11.1.1.1.10 电压术语（以伏特为单位）
          11. 11.1.1.1.11 交流电压术语（以 VRMS 为单位）
          12. 11.1.1.1.12 效率术语
    2. 11.2 文档支持
      1. 11.2.1 相关文档
    3. 11.3 社区资源
    4. 11.4 商标
    5. 11.5 静电放电警告
    6. 11.6 Glossary
  12. 12机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

5 Pin Configuration and Functions

DBV Package
6-Pin SOT-23
Top View
UCC28722 pin_lusbl7.gif

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
CBC 1 I Cable compensation is a programming pin for compensation of cable voltage drop. Cable compensation is programmed with a resistor to GND.
CS 4 I Current sense input connects to a ground-referenced current-sense resistor in series with the power switch. The resulting voltage is used to monitor and control the peak primary current. A series resistor can be added to this pin to compensate the peak switch current levels as the AC-mains input varies.
DRV 3 O Drive is an output used to drive the base of an external high voltage NPN transistor.
GND 5 — The ground pin is both the reference pin for the controller and the low-side return for the drive output. Special care should be taken to return all AC decoupling capacitors as close as possible to this pin and avoid any common trace length with analog signal return paths.
VDD 2 I VDD is the bias supply input pin to the controller. A carefully-placed bypass capacitor to GND is required on this pin.
VS 6 I Voltage sense is an input used to provide voltage and timing feedback to the controller. This pin is connected to a voltage divider between an auxiliary winding and GND. The value of the upper resistor of this divider is used to program the AC-mains run and stop thresholds and line compensation at the CS pin.
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