SLVUDI4 October   2025

 

  1.   1
  2.   Description
  3.   Features
  4. 1Applications
  5.   5
  6. 2Evaluation Module Overview
    1. 2.1 Introduction
    2. 2.2 Kit Contents
    3. 2.3 Specification
    4. 2.4 Device Information
  7. 3Hardware
    1. 3.1 Input and Output Connections
  8. 4Implementation Results
    1. 4.1 Test Setup
      1. 4.1.1 Start-Up Procedure
    2. 4.2 Output Current Setting
  9. 5Hardware Design Files
    1. 5.1 Schematic
    2. 5.2 Layout
    3. 5.3 Bill of Materials
  10. 6Additional Information
    1. 6.1 Trademarks
  11. 7References

4.2 Output Current Setting

The FB voltage is regulated to a 200mV reference voltage. The LED current is set externally using a current-sense resistor in series with the LED strings. The value of the RSET (R3 on EVM) is calculated using:

Equation 1. IOUT=VFBRSET

where

  • ILED = total output current of LED strings
  • VFB = regulated voltage of FB pin
  • RSET = current sense resistor

The output current tolerance depends on the FB accuracy and the current sensor resistor accuracy.

R2 is optional resistor paralleled with R3 to fine tune the RSET to target value, or used to balance the total power loss on RSET.