SLUUCQ0A may   2023  – june 2023 TPS922052 , TPS922053 , TPS922054 , TPS922055

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Warnings and Cautions
  6. 3Description
    1. 3.1 Typical Applications
  7. 4Test Setup
    1. 4.1 Connector Description
    2. 4.2 Input/Output Connection
  8. 5Typical Characteristics Curves and Waveforms
    1. 5.1 Efficiency
    2. 5.2 Line Regulation
    3. 5.3 Load Regulation
    4. 5.4 Analog Dimming Performance
    5. 5.5 PWM Dimming Performance
    6. 5.6 Hybrid Dimming Performance
    7. 5.7 Flexible Dimming Performance
  9. 6Schematic
  10. 7Layout
  11. 8Bill of Materials
  12. 9Revision History

5.3 Load Regulation

Figure 5-4 shows the LED current deviation vs. the number of LEDs in series in analog dimming mode. Input voltage VIN is set at 48 V. LED current is set at 1 A and 4 A with analog dimming. White LEDs are used as load. The number of LEDs in series is 8, 9, 10, 11, and 12, respectively. The frequency of the input PWM signal at the ADIM/HD pin is 20 kHz.

Figure 5-6 shows the LED current deviation vs. the number of LEDs in series in PWM dimming mode. Input voltage VIN is set at 48 V. LED current is set at 1 A and 4 A with PWM dimming. White LEDs are used as load. The number of LEDs in series is 8, 9, 10, 11, and 12, respectively. The frequency of the input PWM signal at the PWM/EN pin is 20 kHz.

GUID-20230506-SS0I-5TVG-QTRQ-6WFLR3NL5DVN-low.svgFigure 5-4 LED Current Deviation vs. Number of LEDs in Series in Analog Dimming Mode
GUID-20230506-SS0I-XJ0R-NK7N-C3JBXQFGX77B-low.svgFigure 5-5 LED Current Deviation vs. Number of LEDs in Series in PWM Dimming Mode