DM135B Siti, DM135B Datasheet - Page 14

• Manufacturer Part Number: DM135B
• Description: (DM134B / DM135B) 16 BIT CONSTANT CURRENT LED DRIVERS
• Manufacturer: Siti

www.DataSheet4U.com
System Configuration Example
16-Bit Constant Current LED Drivers
[1] Output current (I
[2] LED supply voltage (V
additional R can be used to reduce the Vout when the outputs consume current is as follows:
Note
advisable to pattern the ground layout with minimized inductance so that the switching noise induced
by the input signals and the output sink current would not cause chip malfunction. To prevent drivers’
outputs from damaging by overshoot stresses, it is also advisable not to turn off the drivers and scan
transistors simultaneously. For the QFN package, the IC’s thermal pad, which is internally connected to
the bottom side of chip, should be connected to GND. In addition, a good PCB layout pattern of the
thermal pad is required in order to have a better performance in thermal effect.
This device has only one ground pin shared by signal, output sink current, and power ground. It is
Sink current is set by the external resistor as shown in the figure of Iout vs. Rext.
To prevent too much power from dissipating by the higher V
點晶科技股份有限公司
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
點晶科技股份有限公司
點晶科技股份有限公司
V
CPU
LED
SCAN
= V
CE
OUT
( T
)
r
V
LED
sat
ENABLE
CLOCK
SERIAL-IN
ENABLE
CLOCK
SERIAL-IN
LATCH
LATCH
) setup
) + V
R =
R-EXT
R-EXT
f
( LED forward voltage ) + V
V
GND
GND
LED
Preliminary
I
O
(max)
V
SERIAL-OUT
SERIAL-OUT
CE
OUT15
OUT15
OUT0
OUT0
*
-13-
V
Bit
f
(max)
Vo
V
O
(min)
O
＋
LED
Vf
—
( IC output voltage)
of the device, an
DM134B 、 、 、 、 DM135B
V
LED
R
V
＋
—
CE
= 3~4 (V)
Version ： ： ： ： A.001