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XRP7618EVB Datasheet(PDF) 6 Page - Exar Corporation

Part No. XRP7618EVB
Description  8-Channel Constant Current Linear LED Driver With Smart TalkTM
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRP7618EVB Datasheet(HTML) 6 Page - Exar Corporation

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© 2011 Exar Corporation
6/10
Rev. 1.0.0
THEORY OF OPERATION
The
XRP7618
is
an
eight
channel
programmable constant current LED driver
capable of up to 100mA per channel. A single
external resistor adjusts the current for each
channel over a 10mA to 100mA range with
tight matching between channels.
Dimming is supported through a standard
PWM scheme or through an analog signal.
Furthermore, the XRP7618 maximizes the
overall
system
efficiency
by
dynamically
reporting the minimum LED voltage necessary
to remain in current regulation mode when
used with a boost converter.
Multiple XRP7618s can be placed in parallel to
drive over 8 strings of LEDs; however, unused
channels should be tied to ground.
Built-in under voltage lock out, open LED and
over temperature protections insure safe
operations
under
abnormal
operating
conditions.
LED CHANNELS CURRENT SETTING
The maximum LED current can be set up to
100mA per channel through the ISET pin. To
set the reference current ISET, connect a
resistor RSET between this pin and ground. The
value of RSET can be calculated by the following
formula:
1.194
This reference current is multiplied internally
with a gain (K) of 400 then mirrored on all
enabled channels. This sets the maximum LED
current, referred to as 100% current (ILEDMAX).
The value can be calculated by the following
formula:
or,
1.194
400
1.194
The LED current can be reduced from 100%
by PWM dimming control.
PWM DIMMING CONTROL
The LED current can be adjusted by applying a
PWM signal to the PWM pin. In this mode, all
enabled channels are adjusted at the same
time and brightness is adjusted from 1% to
100% of ILEDMAX.
The supported external PWM signal frequency
is 100Hz to 25kHz.
ANALOG DIMMING CONTROL
Besides PWM dimming control, the LED
current can be controlled continuously (from
highest to lowest LED current) by raising the
voltage at the bottom of RSET from 0V
normally to 1V max, respectively. RSET value
may be determined as
1.194
400
where, 1.194V is a typical ISET pin voltage,
VMOD is an adjustment voltage applied to the
bottom side of RSET, 400 is the typical current
multiplication ratio, and ILEDMAX is the required
LED current per channel.
Fig. 10: XRP7618 Analog Dimming Control
If adjustment voltage VMOD isn’t used, RSET
resistor should be connected to ground.
SYSTEM POWER OPTIMIZATION
The Smart Talk feature enables XRP7618 to
maximize the overall system power efficiency,
when used with a step-up converter, by
dynamically
reporting
the
minimum
LED
channel voltage needed to maintain current
regulation mode. The XRP7618 samples the
voltage on each channel input and reports the
lowest voltage of all strings via the FB signal
to the associated step up converter.
If placed in shutdown through the EN pin or if
all channels are inactive, the XRP7618 outputs


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