SLVSFJ2B December   2020  – February 2023 TPS22950

PRODUCTION DATA  

  1. 1 Features
  2. 2 Application
  3. 3 Description
  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
    6. 7.6 Switching Characteristics
    7. 7.7 Typical Characteristics
  8. 8 Parameter Measurement Information
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Current Limiting (TPS22950, TPS22950C)
      2. 9.3.2 Current Limiting (TPS22950L)
      3. 9.3.3 Adjusting the Current Limit
      4. 9.3.4 Reverse Current Blocking (TPS22950, TPS22950C)
    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 Curves
    3. 10.3 Power Supply Recommendations
    4. 10.4 Layout
      1. 10.4.1 Layout Guidelines
      2. 10.4.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Support Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

9.3.3 Adjusting the Current Limit

The current limit is adjusted by connecting an external resistor from the ILIM pin to GND. The current limit resistor can be chosen using the equation:

Equation 1. ILIM = 1.18 × (RILIM)–1.072

The units for the equation are amps for ILIM and kilohms for RILIM. For the TPS22950L, the device is only limiting current during a short period of time. Therefore, the peak value of the current (ILIM,PEAK) may be more applicable for system considerations. The equation for this parameter is below:

Equation 2. ILIM,PEAK = 1.31 × (RILIM)–1.042
The RILIM resistor is also used to set the high current detection threshold for the TPS22950L, and that equation is shown below.
Equation 3. IHCD = (0.988 / RILIM) + 0.06
The units for the equation are amps for IHCD and kilohms for RILIM.