SLVSI14 March   2026 TPS922152

ADVANCE INFORMATION  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 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
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 Adaptive Off-Time Mode
      2. 6.3.2 Setting LED Current
      3. 6.3.3 VIN UVLO & Clamping
      4. 6.3.4 Dimming Mode
        1. 6.3.4.1 PWM Dimming
        2. 6.3.4.2 Analog Dimming
        3. 6.3.4.3 External Shunt Dimming
      5. 6.3.5 Fault Protection
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Application
      1. 7.2.1 TPS922152 60V Input Bus, 5A Output, 16-piece WLED With Analog and PWM Dimming
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
          1. 7.2.1.2.1 Inductor Selection
          2. 7.2.1.2.2 Input Capacitor Selection
          3. 7.2.1.2.3 Output Capacitor Selection
          4. 7.2.1.2.4 Sense Resistor Selection
          5. 7.2.1.2.5 Other External Components Selection
        3. 7.2.1.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Receiving Notification of Documentation Updates
    2. 8.2 Support Resources
    3. 8.3 Trademarks
    4. 8.4 Electrostatic Discharge Caution
    5. 8.5 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

6.3.5 Fault Protection

The TPS922152 and TPS922153 are able to provide fault protections and send fault report signals by pulling down the open-drain FAULT pin in many fault conditions, including LED open, LED ± short, LED short to PGND, sense resistor open and short, switching FET open. The device stops switching after the fault protection occurs. It hiccups every 1.6 second and recovers once fault is removed. The device is disabled without hiccups when VCS > VCS_OVP and then recovers after UVLO and restart with fault removed.
Table 6-2 Protections
TYPE CRITERION BEHAVIOR
LED open load tON > tON_MAX The device stops switching. It hiccups every 1.6s and recovers when fault is removed.
LED+ and LED- short circuit during switching operation (shunt dimming mode is disabled) VCS > VCS_OVP The device stops switching. It recovers after UVLO and restart with fault removed.
LED- short to PGND tON > tON_MAX The device stops switching. It hiccups every 1.6s and recovers when fault is removed.
Sense-resistor open circuit VCS > VCS_OVP The device stops switching. It recovers after UVLO and restart with fault removed.
Sense-resistor short circuit tON > tON_MAX The device stops switching. It hiccups every 1.6s and recovers when fault is removed.
Switching FET open circuit tON > tON_MAX The device stops switching. It hiccups every 1.6s and recovers when fault is removed.
The FAULT pin open drain is active by connecting the pin to a VCC higher than 2.4V through a pull-up resistor RFAULT. Thus, the FAULT pin is pulled down to ground once fault occurs. When FAULT pin is not used, please connect it to GND, do not let FAULT pin floating.
TPS922152 FAULT Open Drain Figure 6-4 FAULT Open Drain