LED7708 flickering/flashing issue
- March 15, 2022
- 1 reply
- 1105 views
Hi
We observe sudden changes and flickering especially at low level luminosity.
attached oscilloscope capture_1 is taken at one of green LED channels. During the dimming cycle, the ghost pattern causes momentary flashes in LED brightness.
again oscilloscope capture_2.PNG and oscilloscope capture_3.PNG are taken at one of green channels. In this case LOW side resistor of output driver value decreased; and noticed a noise at ON state. There is also a flicker in this case and we suppose the cause is the noise seen in oscilloscope capture_3.PNG.
The flickering and flashing mostly seen at low luminosity values.
Do you have and suggestion on fixing these?
our design is:
LED7708 : 10 channels active, and 8 LEDs on each channel. There are 4 LED7708s on the same board.
LED PN : osram LRTB GVTG
thanks,
Baris
