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LDS8846 Datasheet(PDF) 5 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) 5 Page - IXYS Corporation

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LDS8846
© 2009 IXYS Corp.
5
Doc. No. 8846DS, Rev. N1.6
Characteristics subject to change without notice
PIN DESCRIPTION
Pin #
Name
Function
1
EN
Device Enable.
2
CTRL0
Output Control Bit 0 (See Table Control Pin Function)
3
CTRL1
Output Control Bit 1 (See Table Control Pin Function)
4
CTRL2
Output Control Bit 2 (See Table Control Pin Function)
5
ISET
LED current setting pin
6
VOUT
Output voltage to the LED anodes
7
VIN
Input Voltage
8 - 11
NC
No internal connect
12
PGND
Power Ground
13
LED4
LED4 Cathode Terminal
14
LED3
LED3 Cathode Terminal
15
LED2
LED2 Cathode Terminal
16
LED1
LED1 Cathode Terminal
PAD
PAD
Connect to GND on the PCB
PIN FUNCTION
EN is a Device Enable. This pin is high impedance.
There should be a pull down resistor <100k when
control signal is floating.
CTRL0, CTRL1, CTRL2 are Output Control Bits
(See Table 2) and PWM LED brightness control logic
inputs. Guaranteed levels of logic high and logic low
are set at 1.3 V and 0.4 V respectively. CTRL0 and
CTRL1 pins are high impedance, and they should be
pull down by resistor <100k when control signal is
floating. CTRL2 pin has internal pull-up resitor ~100k.
ISET is a LED current setting pin. Resistor RSET
connected from this pin to ground controls LED
current. Connect this pin to ground directly for factory
preset LED current value 30 mA.
VIN is the device supply pin. A small 1μF ceramic
bypass capacitor is required between the VIN pin and
ground at the device. The operating input voltage
range is from 2.7 V to 5.5 V. Whenever the input
supply falls below the under-voltage threshold (2.2
V), all the LED channels are disabled, and the device
enters shutdown mode.
VOUT is the charge pump output. Connect it to the
LED anodes. A small 1μF ceramic bypass capacitor
is required between the VOUT pin and ground near the
device.
GND is the current regulators ground current source.
Connect this pin to the ground plane on the PCB as
close to the package as possible.
LED1 – LED4 provide the internal regulated current
sink for each of the LED cathodes. These pins enter
a high-impedance zero current state when the device
is in shutdown mode.
PAD is the exposed pad underneath the package.
For best thermal performance, the tab should be
soldered to the PCB and connected to the ground
plane


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