SLUUCQ0C August   2025  – September 2025 TPS922052 , TPS922053 , TPS922054 , TPS922055

PRODUCTION DATA  

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6. 1 Introduction
  7. 2 Warnings and Cautions
  8. 3 Description
    1. 3.1 Typical Applications
  9. 4 Test Setup
    1. 4.1 Connector Description
    2. 4.2 Input/Output Connection
  10. 5 Typical 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
  11. 6 Schematic
  12. 7 Layout
  13. 8 Bill of Materials
  14. 9 Additional Information
    1.     Trademarks
  15. 10Revision History

5.6 Hybrid Dimming Performance

Figure 5-11, Figure 5-12 show the hybrid dimming waveforms at 10%, and 20% duty cycles, respectively. Input voltage is 48V, with 7 white LEDs in series used as load. The full-scale LED current is set at 4A. The ADIM/HD pin is always low. The frequency of the input PWM signal at the PWM/EN pin is 20kHz.

TPS922055EVM TPS922055 Waveforms at 10% Duty Cycle, 20kHz Hybrid Dimming Figure 5-11 Waveforms at 10% Duty Cycle, 20kHz Hybrid Dimming
TPS922055EVM TPS922055 Waveforms at 20% Duty Cycle, 20kHz Hybrid Dimming Figure 5-12 Waveforms at 20% Duty Cycle, 20kHz Hybrid Dimming

When the hybrid dimming is enabled, the LED current is regulated by the analog dimming at high brightness level (12.5% ~ 100%) and by the PWM dimming at low brightness level (0%~12.5%).

Figure 5-13 gives the test result of linearity of hybrid dimming, in comparison with the theoretical value. Input voltage is 48V, with 7 white LEDs in series used as load. The full-scale LED current is set at 4A. The frequency of the input PWM signal at the PWM/EN pin is 20kHz.

TPS922055EVM TPS922055 Hybrid Dimming Linearity Figure 5-13 Hybrid Dimming Linearity