SLUUCI5A July   2021  – November 2021 TPS92519-Q1

 

  1.   Trademarks
  2. 1Introduction
  3. 2Warnings and Cautions
  4. 3Description
    1. 3.1 Typical Applications
    2. 3.2 Features
    3. 3.3 Connector and Test Point Description
    4. 3.4 Electrical Performance Specifications
  5. 4Test Setup
    1. 4.1 Input Supplies and LED Load Connections
    2. 4.2 Switching Frequency Selection
    3. 4.3 Analog Dimming Using IADJx
    4. 4.4 PWM Dimming Using UDIMx and PWM Test Points
  6. 5Performance Data and Typical Characteristic Curves
    1. 5.1 Efficiency
    2. 5.2 Analog Dimming
    3. 5.3 PWM Dimming
    4. 5.4 PWM Dimming Waveforms
  7. 6Schematic
  8. 7TPS92519EVM-169 PCB Layout
  9. 8Bill of Materials
  10. 9Revision History

4.4 PWM Dimming Using UDIMx and PWM Test Points

PWM dimming can be achieved by either using the PWM1 and PWM2 test points or by the UDIM1 and UDIM2 test points. UDIM have resistor dividers that setup the UVLO from VIN (Figure 4-8). The voltage is low enough that you can connect the function generator directly. If UDIM was pulled to VIN by a resistor then the PWM test points should be used (Figure 4-9). The PWMx signal inverts the signal to UDIMx.

Figure 4-8 PWM Dimming Using PWM1 and PWM2
Figure 4-9 PWM Dimming Using UDIM1 and UDIM2