Texas Instruments TPS92520EVM-133, User Manual

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3 Performance Data and Typical Characteristic Curves
Figure 3-1 illustrates the efficiency results for the TPS92520EVM-133 vs output power for different input voltage
V
IN
.
LED Current (mA)
E
ffic
ien
c
y
(%
)
0 200 400 600 800 1000 1200 1400 1600 1800
0.75
0.775
0.8
0.825
0.85
0.875
0.9
0.925
0.95
0.975
3 LEDs
6 LEDs
9 LEDs
12 LEDs
Conditions: V
IN
60 V, f
SW
= 437 kHz .
Figure 3-1. Efficiency vs LED Current
3.1 1.5A CC BUCK SW-Node Voltage Waveform
Figure 3-1 shows the switch node voltage waveforms of the channel 1 and channel 2 of the TPS92520EVM-133
dual channel BUCK LED driver. The switch node (SW1 and SW2) of the two channels that are completely
independent of each other. SW1 and SW2 are not in phase and are not 180 degrees out of phase. The switching
frequency, input voltage, and out LED current setpoints can also be set independently on each channel.
V
IN
= 48 V, V
LED1
= 30 V, V
LED2
= 10 V
Figure 3-2. Dual-Channel Buck SW-Node Voltage
www.ti.com Performance Data and Typical Characteristic Curves
SLUUCC4 – OCTOBER 2020
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