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S P 7 6 8 6 / S P 7 6 8 6 A
C o n s t a n t C u r r e n t F l a s h D r i v e r i n D F N 2 m m x 3 m m
O VERVOLTAGE P ROTECTION
The SP7686 has over voltage protection. If the
output voltage rises above the 5.5V threshold,
the over voltage protection shuts off all of the
output switches to prevent the output voltage
from rising further. When the output
decreases below 5.5V, the device resumes
normal operation.
O VERCURRENT P ROTECTION
The overcurrent protection circuitry monitors
the average current out of the VOUT pin. If
the average output current exceeds
approximately 1.5Amp, then the overcurrent
protection circuitry shuts off the output
switches to protect the chip.
APPLICATIONS INFORMATION
The SP7686 can be used with multiple LEDs in
parallel as shown below. For best
performance, the LEDs should be in a single
package, preferably from a single die to have
better matching for forward voltage VF for a
given forward current IF. In practice, if the VF
of one LED is higher than the others, it will
consume a larger IF, which will raise its
temperature which will then cause its VF to
reduce, correcting the imbalance. The overall
current will be the sum of the individual
currents, for example ITOTAL = 4*I LED .
Figure 24.
Fig. 1: SP7686 with 4 LEDs in parallel
Fig. 2: SP7686A with 4 LEDs in parallel
? 2010 Exar Corporation
11/16
Rev. 2.1.0
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