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

Flexible Dimming Performance

Figure 5-14, Figure 5-15 and Figure 5-16 show the flexible dimming waveforms at different ADIM/HD pin and PWM/EN pin input duty cycles. Input voltage is 48 V, with 7 white LEDs in series used as load. The full-scale LED current is set at 4 A. The frequency of the input PWM signal at the ADIM/HD pin and PWM/EN pin is 20 kHz.

GUID-20230220-SS0I-L71S-RT2B-5FXRXTLHKKCR-low.pngFigure 5-14 Waveforms at 50% Duty Cycle ADIM/HD and 50% Duty Cycle PWM/EN
GUID-20230220-SS0I-S97K-XMFL-QDXBHDTBH2MB-low.pngFigure 5-15 Waveforms at 10% Duty Cycle ADIM/HD and 90% Duty Cycle PWM/EN
GUID-20230220-SS0I-JR8C-B11Z-9Z2JPD1XR5LH-low.pngFigure 5-16 Waveforms at 90% Duty Cycle ADIM/HD and 10% Duty Cycle PWM/EN