SLUUBZ9 May   2020 TPS92200

 

  1.   TPS92200D1/D2EVM 30-V, 1.5-A Buck LED Driver Evaluation Module
    1.     Trademarks
    2. 1 Introduction
    3. 2 Warnings and Cautions
    4. 3 Description
      1. 3.1 Typical Applications
      2. 3.2 Test Setup
        1. 3.2.1 Connector Description
        2. 3.2.2 Input/Output Connection
    5. 4 Performance Data and Typical Characteristics Curves
      1. 4.1 Efficiency
      2. 4.2 Line Regulation
      3. 4.3 Load Regulation
      4. 4.4 Analog Dimming
      5. 4.5 PWM Dimming Waveforms
    6. 5 Schematic
    7. 6 TPS92200D1/D2EVM PCB Layout
    8. 7 Bill of Materials

4.3 Load Regulation

Figure 5 shows the output current deviation ratio vs. output voltage in analog dimming mode. VDIM is 1.2V. White LEDs are used as load, LED number in series is 1, 2, 3, 4, 5, and 6, respectively. LED current is set at 250mA, 500mA, 1.0A and 1.5A, respectively. The typical forward voltage of the White LED is 3.1 V at 1.5 A, and 2.8 V at 0.35 A. Changing the LED number in series from 1 piece to 6 pieces will change the output voltage from approximately 3 V to approximately 18 V. Input voltage is fixed at 24 V.

LoadRegulation.gifFigure 5. LED Current Deviation vs. LED Numbers in Series in Analog Dimming Mode, VIN = 24 V