Texas Instruments TPS92520EVM-133, User Manual

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3.2 Start-up Waveforms
Figure 3-3 shows the start-up waveforms for channel 1 (V
LED1
and I
LED1
) of the TPS92520EVM-133 dual-
channel buck LED driver settings set to 1 A I
LED1
with 6 LEDs .
V
IN
= 48 V, V
LED1
= 20 V, I
LED1
= 1.0 A
Figure 3-3. Soft-Start Waveforms
3.3 PWM Dimming
Figure 3-4 shows the load transient on the output of the TPS92520EVM-133 LED buck driver. The output LED
string controlled by the PWM dimming registers at 50% duty cycle at 610 Hz PWM frequency. The V
LED
waveform (channel 2 of the osope) and the I
LED
waveform (channel 4 of the oscope) shows the resulting
undershoot and overshoot.
V
IN
= 48 V, V
LED1
= 28 V, I
LED1
= 1.5 A
Figure 3-4. 1.6-A Buck LED Driver Load Transient
4 Schematic, PCB Layout, and Bill of Materials
This section contains TPS92520EVM-133 schematics, PCB layouts, and bill of materials (BOM).
Performance Data and Typical Characteristic Curves www.ti.com
10 TPS92520EVM-133 Dual 1.6-A Synchronous Buck LED Driver Evaluation
Module SLUUCC4 – OCTOBER 2020
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