ZHCSCA8A March   2014  – April 2019 TPS65286

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      简化原理图
      2.      效率
        1.       修订历史记录
  4. 4 Pin Configuration and Functions
    1.     Pin Functions
  5. 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
  6. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Power Switch
        1. 6.3.1.1 Over Current Condition
        2. 6.3.1.2 Reverse Current and Voltage Protection
        3. 6.3.1.3 nFAULT1/2 Response
        4. 6.3.1.4 Under-Voltage Lockout (UVLO)
        5. 6.3.1.5 Enable and Output Discharge
        6. 6.3.1.6 Power Switch Input and Output Capacitance
        7. 6.3.1.7 Programming the Current-Limit Threshold
      2. 6.3.2 Buck DCDC Converter
        1. 6.3.2.1  Output Voltage
        2. 6.3.2.2  Clock Synchronization
        3. 6.3.2.3  Error Amplifier
        4. 6.3.2.4  Slope Compensation
        5. 6.3.2.5  Enable and Adjusting Under-Voltage Lockout
        6. 6.3.2.6  Soft-Start Time
        7. 6.3.2.7  Internal V7V Regulator
        8. 6.3.2.8  Hard Short Circuit Protection
        9. 6.3.2.9  Bootstrap Voltage (BST) and Low Dropout Operation
        10. 6.3.2.10 Thermal Performance
        11. 6.3.2.11 Loop Compensation
    4. 6.4 Device Functional Modes
      1. 6.4.1 Pulse Skipping Mode Operation
  7. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Step by Step Design Procedure
        2. 7.2.2.2 Related Parts
        3. 7.2.2.3 Inductor Selection
        4. 7.2.2.4 Output Capacitor Selection
        5. 7.2.2.5 Input Capacitor Selection
        6. 7.2.2.6 Soft-Start Capacitor Selection
        7. 7.2.2.7 Minimum Output Voltage
        8. 7.2.2.8 Compensation Component Selection
        9. 7.2.2.9 Auto-Retry Functionality of USB Switches
      3. 7.2.3 Application Performance Plots
  8. 8 Power Supply Recommendations
  9. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Layout Example
  10. 10器件和文档支持
    1. 10.1 器件支持
      1. 10.1.1 第三方产品免责声明
    2. 10.2 接收文档更新通知
    3. 10.3 社区资源
    4. 10.4 商标
    5. 10.5 静电放电警告
    6. 10.6 术语表
  11. 11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

7.2.2.5 Input Capacitor Selection

A minimum 10-µF X7R/X5R ceramic input capacitor is recommended to be added between VIN and GND. These capacitors should be connected as close as physically possible to the input terminals of the converters as they handle the RMS ripple current shown in Equation 19. For this example, Iout = 6 A, Vout = 5 V, minimum Vin_min = 24 V. The input capacitors must support a ripple current of 2.4-A RMS.

Equation 19. TPS65286 eq19_Iinrms_slvsca4.gif

The input capacitance value determines the input ripple voltage of the regulator. The input voltage ripple can be calculated using Equation 20. Using the design example values, Iout_max = 6 A, Cin = 22 µF, fsw = 500 kHz, yields an input voltage ripple of 136 mV.

Equation 20. TPS65286 eq20_Vin_slvsca4.gif

To prevent large voltage transients, a low ESR capacitor sized for the maximum RMS current must be used.