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

4.5 PWM Dimming Waveforms

Figure 8, Figure 9, and Figure 10 illustrate the PWM dimming waveforms at 1%, 50%, and 99% duty cycles, respectively, in PWM dimming mode. Input voltage is 24 V, with 6 White LEDs in series used as load. The LED current is set at 1.0 A, PWM frequency is 100 Hz.

D1PWMDimmingDuty1.gifFigure 8. 1% Duty Cycle 100-Hz PWM Dimming(TPS92200D1)
D1PWMDimmingDuty50.gifFigure 9. 50% Duty Cycle 100-Hz PWM Dimming(TPS92200D1)
D1PWMDimmingDuty99.gifFigure 10. 99% Duty Cycle 100-Hz PWM Dimming(TPS92200D1)