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

4.4 Analog Dimming

Figure 6 shows the output current ratio to the full-scale output current versus VDIM voltage level in analog dimming mode. VIN = 12 V, 1 White LED is used as load. The LED current is set at 1.0 A with VDIM=1.2V.

D1AnalogDimming.gifFigure 6. Output Current Ratio vs. VDIM in Analog Dimming Mode(TPS92200D1)

Figure 7 shows the output current ratio to the full-scale output current versus PWM duty cycle in analog dimming mode. VIN = 12 V, 2 White LEDs in series used as load. The LED current is set at 1.0 A with 100% PWM duty. PWM frequency is 50 kHz.

D2AnalogDimming.gifFigure 7. Output Current ratio vs PWM Duty Cycle in Analog Dimming Mode(TPS92200D2)