Datasheet

Operation description LED7707
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At the point marked as “1” in Figure 17 one LED fails becoming a short-circuit. The voltage
across the current generator of the channel where the failed LED is connected increases by
an amount equal to the forward voltage of the faulty LED. Since the voltage across the
current generator is above the threshold (4 V), the device is turned off and the fault pin is set
low (point “2”). Note that, once a new dimming cycle starts (point “3”), the device waits the
masking time (approximately 100 μs) and then sets the FAULT pin low and turns off.
Figure 17. Shorted LED detection (MODE to GND)
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1
2
masking time
3
11
22
masking time
33