JAJSJD6A July   2021  – December 2021 TPS22992

PRODUCTION DATA  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1  Absolute Maximum Ratings
    2. 7.2  ESD Ratings
    3. 7.3  Recommended Operating Conditions
    4. 7.4  Thermal Information
    5. 7.5  Electrical Characteristics (VBIAS = 5 V)
    6. 7.6  Electrical Characteristics (VBIAS = 3.3 V)
    7. 7.7  Electrical Characteristics (VBIAS = 1.5 V)
    8. 7.8  Switching Characteristics (VBIAS = 5 V)
    9. 7.9  Switching Characteristics (VBIAS = 3.3 V)
    10. 7.10 Switching Characteristics (VBIAS = 1.5 V)
    11. 7.11 Typical Characteristics
  8. 8 Timing Diagram
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 ON and OFF Control
      2. 9.3.2 Adjustable Quick Output Discharge
      3. 9.3.3 Adjustable Slew Rate
      4. 9.3.4 Power Good (PG) Signal
      5. 9.3.5 Thermal Shutdown
      6. 9.3.6 Short Circuit Protection (TPS22992S)
    4. 9.4 Device Functional Modes
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Performance Plots
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Receiving Notification of Documentation Updates
    2. 13.2 サポート・リソース
    3. 13.3 Trademarks
    4. 13.4 Electrostatic Discharge Caution
    5. 13.5 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

9.3.3 Adjustable Slew Rate

A capacitor to GND on the CT pin sets the slew rate, and the higher the capacitance the lower the slew rate. The voltage on the CT pin can be as high as 15 V; therefore, the minimum voltage rating for the CT capacitor must be 30 V for optimal performance. Rise times for VBIAS = 5 V are shown below.

CT Capacitor

VIN = 5 V

VIN = 3.3 V

VIN = 1.8 V

VIN = 1.2 V

VIN = 0.8 V

0 pF

147 µs

113 µs

77 µs

59 µs

45 µs

220 pF

426 µs

297 µs

179 µs

129 µs

94 µs

1000 pF

1430 µs

962 µs

553 µs

386 µs

282 µs

4700 pF

6130 µs

4090 µs

2330 µs

1640 µs

1180 µs

The following equation can be used to estimate the rise time for different VIN and CT capacitors at VBIAS = 5 V.

Equation 1. tR = VIN × (0.27 × CT + 25.5) + 24.9

Where:

  • tR = Rise time in µs

  • VIN = Input voltage in V

  • CT = CT capacitance in pF