Hi We observe sudden changes and flickering especially at low position luminosity. attached oscilloscopecapture_1 is taken at one of the green LED channels. During the dimming cycle, the ghost pattern causes momentary flashes in LED brightness. again oscilloscopecapture_2.PNG and oscilloscopecapture_3.PNG are taken at ...Read more
Hi
We observe sudden changes and flickering especially at low position luminosity.
attached oscilloscopecapture_1 is taken at one of the green LED channels. During the dimming cycle, the ghost pattern causes momentary flashes in LED brightness.
again oscilloscopecapture_2.PNG and oscilloscopecapture_3.PNG are taken at one of the green channels. In this case, the LOW side resistor of the output driver value decreased; and noticed a noise at the ON state. There’s also a flicker in this case and we suppose the cause is the noise seen in oscilloscopecapture_3.PNG.
The flickering and flashing are substantially seen at low luminosity values.
Do you have any suggestions on fixing these?
our design is
LED7708 has 10 channels active, and 8 LEDs on each channel. There are 4 LED7708s on the same board.
LED PN osram LRTB GVTG
Thanks
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Hello, C19 (parallel to Riseth resistor) marked as NC in the evaluation board schematics, was populated in our design. Removing this cap. solved the problem. Thank You
Hello,
C19 (parallel to Riseth resistor) marked as NC in the evaluation board schematics, was populated in our design. Removing this cap. solved the problem. Thank You
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