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X R P 7 6 1 8
8 - C h a n n e l C o n s t a n t C u r r e n t L i n e a r L E D D r i v e r W i t h
S m a r t T a l k T M
a logic low to the converter via the SDB signal.
Furthermore, the SDB signal is synchronous to
the PWM signal when PWM dimming is used.
O PEN LED P ROTECTION
The XRP7618 provides a built-in protection for
open LED channel. Upon detection of an open
LED channel event, the FB signal is driven low
to allow the step-up converter to operate open
loop which in turn raises the voltage on the
remaining CHx pins. Upon reaching an
internally pre-set threshold of 3V, the
XRP7618 identifies the faulty channel and
removes it from the control and reporting
loop. At this point the FB signal resumes its
normal function of reporting the lowest LED
channel voltage and hence restores the proper
CHx voltage is no longer reported. Upon
reconnection of the open LED channel, current
will be driven at the programmed level.
P ARALLEL M ODE OF O PERATION
Multiple XRP7618s can be placed in parallel to
drive over 8 strings of LEDs; however, unused
channels should be tied to ground.
While the initial XRP7618 is connected to the
step-up converter via its FB and SDB pins, the
daisy chained XRP7618s are connected to each
other through the respective FBX and SDBX
pins. In this configuration, the initial XRP7618
reports the lowest LED voltage and SDB signal
of all the XRP7618s in parallel. Refer to figure
12.
operations of the converter. Note that the
open LED channel is not disabled; however, its
TYPICAL APPLICATION SCHEMATICS
Fig. 11: Single XRP7618 Application
? 2013 Exar Corporation
7/10
Rev. 1.2.0
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