ZHCSNP8 November   2021 TPS7H1210-SEP

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  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 Internal Current Limit
      2. 7.3.2 Enable Pin Operation
      3. 7.3.3 Programmable Soft-Start
      4. 7.3.4 Thermal Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation
      2. 7.4.2 Dropout Operation
      3. 7.4.3 Disabled
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Adjustable Operation
      2. 8.1.2 Capacitor Recommendations
      3. 8.1.3 Noise Reduction and Feed-Forward Capacitor Requirements
      4. 8.1.4 Power-Supply Rejection Ratio (PSRR)
      5. 8.1.5 Output Noise
      6. 8.1.6 Transient Response
      7. 8.1.7 Post DC-DC Converter Filtering
      8. 8.1.8 Power for Precision Analog
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
    3. 8.3 Do's and Don’ts
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Improve PSRR and Noise Performance
    2. 10.2 Layout Example
    3. 10.3 Thermal Performance
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Spice Models
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 接收文档更新通知
    4. 11.4 支持资源
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 术语表
  12. 12Mechanical, Packaging, and Orderable Information

7.3.3 Programmable Soft-Start

The NR_SS capacitor acts as a noise reduction capacitor and a soft-start capacitor to slow down the rise time of the output. The output rise time, when using an NR_SS capacitor, is approximated by Equation 1.

Equation 1. tSS (ms) = 1.2 × CNR_SS (nF)

In Equation 1, tSS is the soft-start time in milliseconds and CNR_SS is the capacitance at the NR_SS pin in nanofarads.

Figure 7-2 shows the start-up voltage waveforms versus CNR_SS.

Figure 7-2 Start-Up Waveforms vs CNR_SS
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