SNVSCN8A September   2025  – October 2025 TPS923610 , TPS923611 , TPS923612

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Enable and Start-up
      2. 7.3.2 Under-Voltage Lockout (UVLO)
      3. 7.3.3 Shutdown
      4. 7.3.4 Boost Control Operation
      5. 7.3.5 Switching Peak Current Limit
      6. 7.3.6 Over-Voltage Protection
      7. 7.3.7 Output Current Setting
      8. 7.3.8 Output Current PWM Controlled Analog Dimming
      9. 7.3.9 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation Mode
      2. 7.4.2 Over-Voltage Protection Mode
      3. 7.4.3 Shutdown Mode
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 LED Current Set Resistor
        2. 8.2.2.2 Inductor Selection
        3. 8.2.2.3 Output Capacitor Selection
        4. 8.2.2.4 Thermal Considerations
    3. 8.3 Power Supply Recommendations
    4. 8.4 Application Curves
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
    2. 9.2 Receiving Notification of Documentation Updates
    3. 9.3 Support Resources
    4. 9.4 Trademarks
    5. 9.5 Electrostatic Discharge Caution
    6. 9.6 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

7.3.4 Boost Control Operation

The TPS923610/1/2 uses peak current mode (PCM) control and full internal compensation to provide high transient response performance over a wide range of operating conditions.

In the normal operation, at the beginning of each switching cycle, the low-side switch FET is turned on and the inductor current ramps up to a peak current determined by the output of the internal GM amplifier. After the peak current is reached, the current comparator trips and turns off the low-side switch FET. Then, the inductor current goes through the body diode of the high-side switch FET in a dead-time duration and the inductor current decreases. After the dead-time duration, the high-side switch FET is turned on and is not turned off until the calculated adaptive off-time is reached. The adaptive off-time varies as a function of VIN and VOUT, to maintain a nearly constant frequency. After the high-side switch FET is turned off, the inductor current goes through the body diode of the high-side switch FET again in another dead-time duration. After the dead-time duration, the low-side switch FET is turned on again and the switching cycle is repeated.

In light load condition, the TPS923610/1/2 works in forced continuous conduction mode (FCCM). During FCCM, the switching frequency is maintained at an almost constant level over the entire load range. This feature not only benefits the small output current accuracy, but also reduces output ripple and avoids audible noise caused by switching frequency drop.