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LDS8846 Datasheet(PDF) 6 Page - IXYS Corporation

Part # LDS8846
Description  4-Channel Ultra Low Dropout No Noise LED Driver
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Manufacturer  IXYS [IXYS Corporation]
Direct Link  http://www.ixys.com
Logo IXYS - IXYS Corporation

LDS8846 Datasheet(HTML) 6 Page - IXYS Corporation

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LDS8846
© 2009 IXYS Corp.
6
Doc. No. 8846DS, Rev. N1.6
Characteristics subject to change without notice
BLOCK DIAGRAM
Figure 2. LDS8846 Functional Block Diagram
BASIC OPERATION
The device starts operating if the EN pin is set logic
HIGH and input voltage is higher that under voltage
protection lockout threshold.
The low dropout PowerLite
™ Current regulator
performs well at input voltages up to 50 mV greater
than the LED forward voltage significantly increasing
the driver’s efficiency.
Input pins EN, CTRL0, CTRL1, and CTRL2 may be
either logic LOW or HIGH during power-up. However,
logic voltage should never exceed input voltage VIN,
and these pins should not be left float.
LED Current Setting
The desired current value in each of the four LED is
set by external resitor RSET connevted between ISET
pin and ground..
The LED current is 400 times greater than the current
through RSET and can be estimated (in mA) by
following equation:
SET
SET
LED
R
V
x
I
400
, where VSET =1.2V, and RSET is
its resistance in kohms.
RSET value for typical ILED current is shown at the
table below.
ILED, mA
RSET, kΩ Nearest standard 1% value
5
96
95.3
10
48
47.5
15
32
31.6 or 32.4
20
24
23.7 or 24.3
25
19.2
19.1
30
16
15.8 or 16.2
The average current value may be decreased using
PWM signal applied to either CTRL0, CTRL1 or
CTRL2
pin.
The
LDS8846
allows
modulation
frequiencies in the range from 100 Hz to 5 kHz with
duty cycles from 100% to 1% and from 5 kHz to 30
kHz with duty cycles from 100% to 10%. Modulation
frequiencies
lower
than
100 Hz
are
not
recommended especialy at short duty cycles because
LED flicker may be visible.
If CTRL1 and CTRL2 pins are logic HIGH and PWM
signal applies to CTRL0 pin, then all four LEDS are
dimming synchronously.
If CTRL0 and CTRL2 pins are logic HIGH and PWM
signal applies to CTL1 pin, then LEDs from LED1 to
LED3 are dimming, while LED4 is always off.


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