ZHCSD24 October   2014 TPS61169

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 简化电路原理图
  5. 5 修订历史记录
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Handling Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Soft Start-Up
      2. 8.3.2 Open LED Protection
      3. 8.3.3 Shutdown
      4. 8.3.4 Current Program
      5. 8.3.5 LED Brightness Dimming
      6. 8.3.6 Undervoltage Lockout
      7. 8.3.7 Thermal Foldback and Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operation With CTRL
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Inductor Selection
        2. 9.2.2.2 Schottky Diode Selection
        3. 9.2.2.3 Output Capacitor Selection
        4. 9.2.2.4 LED Current Set Resistor
        5. 9.2.2.5 Thermal Considerations
    3. 9.3 TPS61169 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12器件和文档支持
    1. 12.1 第三方产品免责声明
    2. 12.2 商标
    3. 12.3 静电放电警告
    4. 12.4 术语表
  13. 13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

11 Layout

11.1 Layout Guidelines

As for all switching power supplies, especially those high frequency and high current ones, layout is an important design step. If layout is not carefully done, the regulator could suffer from instability as well as noise problems. Therefore, use wide and short traces for high current paths. The input capacitor CIN needs to be close to VIN pin and GND pin in order to reduce the input ripple seen by the IC. If possible choose higher capacitance value for it. The SW pin carries high current with fast rising and falling edge, therefore, the connection between the SW pin to the inductor should be kept as short and wide as possible. The output capacitor COUT should be put close to VOUT pin. It is also beneficial to have the ground of COUT close to the GND pin since there is large ground return current flowing between them. FB resistor should be put close to FB pin. When laying out signal ground, it is recommended to use short traces separated from power ground traces, and connect them together at a single point close to the GND pin.

11.2 Layout Example

layout_drawing_snvsa40.gifFigure 18. TPS61169 Board Layout