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A Product Line of
Diodes Incorporated
ZXLD1374
Application Information (cont.)
PWM Output Current Control & Dimming
The ZXLD1374 has a dedicated PWM dimming input that allows a wide dimming frequency range from 100Hz to 1kHz with 1000:1 resolution;
however higher dimming frequencies can be used – at the expense of dimming dynamic range and accuracy.
Typically, for a PWM frequency of 1kHz, the error on the current linearity is lower than 5%; in particular the accuracy is better than 1% for PWM
from 5% to 100%. This is shown in the graph below for Buck mode:
15.0%
12.5%
V IN = 24V
1500
1250
10.0%
7.5%
5.0%
T A = 25°C
f PWM = 1kHz
I LED
1000
750
500
2.5%
0.0%
Normalized LED
Current Error
250
0
0%
10%
20%
30%
40%
50%
60%
70%
80%
90%
100%
PWM duty cycle
Figure 37 LED Current Linearity and Accuracy with PWM Dimming at 1kHz
For a PWM frequency of 100Hz, the error on the current linearity is lower than 2.5%; it becomes negligible for PWM greater than 5%. This is
shown in the graph below:
15.0%
12.5%
1500
1250
10.0%
V IN = 24V
T A = 25°C
I LED
1000
f PWM = 100Hz
7.5%
5.0%
2.5%
0.0%
Normalized LED
Current Error
750
500
250
0
0%
10%
20%
30%
40% 50% 60%
70%
80%
90%
100%
PWM duty cycle
Figure 38 LED Current Linearity and Accuracy with PWM Dimming at 100Hz
ZXLD1374
Document number: DS35032 Rev. 3 - 2
30 of 39
www.diodes.com
September 2012
? Diodes Incorporated
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