SNVU821 November   2023 TPS92642-Q1

 

  1.   1
  2.   TPS92642EVM-203 5-A Synchronous Buck IR LED Driver Evaluation Module
  3.   Trademarks
  4. 1Introduction
  5. 2Warnings and Cautions
  6. 3Description
    1. 3.1 Typical Applications
    2. 3.2 Features
    3. 3.3 Connector and Test Point Description
    4. 3.4 Electrical Performance Specifications
  7. 4Test Setup
    1. 4.1 Input Supplies and LED Load Connections
    2. 4.2 Pulse Duty Cycle Limit (PLMT) Control
    3. 4.3 Analog Dimming Using IADJ
    4. 4.4 PWM Dimming Using nExt_PWM Test Points
    5. 4.5 Switching Frequency Set Point Using RON
  8. 5Performance Data and Typical Characteristic Curves
    1. 5.1 Efficiency
    2. 5.2 Analog Dimming
    3. 5.3 PWM Dimming
    4. 5.4 PWM Dimming Waveforms
  9. 6Schematic
  10. 7PCB Layout
  11. 8Bill of Materials

3 Description

This user's guide describes the specifications, board connection descriptions, characteristics, operation, and use of the TPS92642-Q1, 5.0-A synchronous buck IR LED driver evaluation module (TPS92642EVM-203). The TPS92642-Q1 device implements an adaptive on-time average current mode control and is designed to be compatible with shunt FET dimming techniques and LED matrix manager-based dynamic beam headlamps. The adaptive on-time control provides near constant switching frequency that can be set from 100 kHz to 2.2 MHz. Inductor current sensing and closed-loop feedback enables better than ±4% accuracy over wide input voltage, output voltage and ambient temperature range.

TPS92642EVM-203 provides a high-brightness LED driver that is designed to operate with an input voltage in the range of 5.5 V to 36 V (nominally at 24 V). The EVM is setup for a default output current of 3.5 A (programmable to 5 A) for an IR LED stack between approximately 3 V and nearly 32 V operating at 2.1 MHz. The TPS92642-Q1 helps provide high efficiency, fast PWM dimming, and accurate wide-range analog dimming.