ZHCSUJ4B January   2022  – January 2024 TPS61376

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 VCC Power Supply
      2. 6.3.2 Enable and Programmable UVLO
      3. 6.3.3 Soft Start and Inrush Current Control During Start-Up
      4. 6.3.4 Switching Frequency
      5. 6.3.5 Adjustable input average Current Limit
      6. 6.3.6 Shut Down and Load Disconnect
      7. 6.3.7 Overvoltage Protection
      8. 6.3.8 Output Short Protection
      9. 6.3.9 Thermal Shutdown
    4. 6.4 Device Functional Modes
      1. 6.4.1 PWM Mode
      2. 6.4.2 Auto PFM Mode
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Setting Output Voltage
        2. 7.2.2.2 Inductor Selection
        3. 7.2.2.3 Bootstrap Capacitor Selection
        4. 7.2.2.4 Input Capacitor Selection
        5. 7.2.2.5 Output Capacitor Selection
        6. 7.2.2.6 Diode Selection
        7. 7.2.2.7 Loop Stability
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
        1. 7.4.2.1 Thermal Considerations
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 第三方产品免责声明
    2. 8.2 接收文档更新通知
    3. 8.3 支持资源
    4. 8.4 Trademarks
    5. 8.5 静电放电警告
    6. 8.6 术语表
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

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机械数据 (封装 | 引脚)
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订购信息

6.3.2 Enable and Programmable UVLO

The TPS61376 has a dual function enable and UVLO circuit. When the input voltage at the VIN pin is above the input UVLO rising threshold of 2.8V and the EN/UVLO pin is pulled above rising threshold, the TPS61376 is enabled and starts switching. The EN/UVLO pin has an accurate UVLO voltage threshold to support programmable input under-voltage lockout with hysteresis. A hysteresis current IUVLO_HYS is sourced out of the EN/UVLO pin to provide hysteresis that prevents on/off chattering in the presence of input voltage noise. By using resistor divider as shown in Figure 6-1 , the turn on threshold can be calculated by using Equation 1.

Equation 1. VIN(UVLO_ON)=VUVLO×(1+R1R2)

where

  • VUVLO is the UVLO threshold of 0.813V at the EN/UVLO pin

The hysteresis between the UVLO turn on threshold and turn off threshold is set by the upper resistor in the EN/UVLO resistor divider and is given by Equation 2

Equation 2. ΔVIN(UVLO)=IUVLO_HYS×R1

where

  • IUVLO is the sourcing current from the EN/UVLO pin when the voltage at the EN/UVLO pin is above VUVLO

GUID-20220307-SS0I-9VWF-FWLP-RCSSHXN9LBQ2-low.svgFigure 6-1 Programmable UVLO with Resistor Divider at EN/UVLO Pin