ZHCS004E May   2009  – July 2016

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 LP38690 的
  5. 5 修订历史记录
  6. 6 Pin Configurations 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  Fixed Frequency PWM Control
      2. 8.3.2  Continuous Current Mode Operation (CCM)
      3. 8.3.3  VIN and Power VIN Pins (VIN and PVIN)
      4. 8.3.4  Voltage Reference
      5. 8.3.5  Adjusting the Output Voltage
      6. 8.3.6  Safe Start-up into Pre-Biased Outputs
      7. 8.3.7  Error Amplifier
      8. 8.3.8  Slope Compensation
      9. 8.3.9  Enable and Adjusting Under-Voltage Lockout
      10. 8.3.10 Adjustable Switching Frequency and Synchronization (RT/CLK)
      11. 8.3.11 Slow Start (SS/TR)
      12. 8.3.12 Power Good (PWRGD)
      13. 8.3.13 Output Overvoltage Protection (OVP)
      14. 8.3.14 Overcurrent Protection
      15. 8.3.15 Thermal Shutdown
      16. 8.3.16 Small Signal Model for Loop Response
      17. 8.3.17 Simple Small Signal Model for Peak Current Mode Control
      18. 8.3.18 Small Signal Model for Frequency Compensation
    4. 8.4 Device Functional Modes
      1. 8.4.1 Adjustable Switching Frequency (RT Mode)
      2. 8.4.2 Synchronization (CLK Mode)
      3. 8.4.3 Bootstrap Voltage (BOOT) and Low Dropout Operation
      4. 8.4.4 Sequencing (SS/TR)
  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 Procedures
        1. 9.2.2.1  Operating Frequency
        2. 9.2.2.2  Output Inductor Selection
        3. 9.2.2.3  Output Capacitor Selection
        4. 9.2.2.4  Input Capacitor Selection
        5. 9.2.2.5  Slow Start Capacitor Selection
        6. 9.2.2.6  Bootstrap Capacitor Selection
        7. 9.2.2.7  Under Voltage Lockout Set Point
        8. 9.2.2.8  Output Voltage Feedback Resistor Selection
          1. 9.2.2.8.1 Minimum Output Voltage
        9. 9.2.2.9  Compensation Component Selection
        10. 9.2.2.10 Fast Transient Considerations
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Estimated Circuit Area
    4. 11.4 Thermal Consideration
  12. 12器件和文档支持
    1. 12.1 接收文档更新通知
    2. 12.2 社区资源
    3. 12.3 商标
    4. 12.4 静电放电警告
    5. 12.5 Glossary
  13. 13机械、封装和可订购信息

10 Power Supply Recommendations

The TPS54620 is designed to operate from an input voltage supply range between 4.5V and 17V. This supply voltage must be well regulated. Power supplies must be well bypassed for proper electrical performance. This includes a minimum of one 4.7µF (after de-rating) ceramic capacitor, type X5R or better from PVIN to GND, and from VIN to GND. Additional local ceramic bypass capacitance may be required in systems with small input ripple specifications, in addition to bulk capacitance if the TPS54620 device is located more than a few inches away from its input power supply. In systems with an auxiliary power rail available, the power stage input, PVIN, and the analog power input, VIN, may operate from separate input supplies. See Figure 55 (layout recommendation) for recommended bypass capacitor placement.