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參數資料
| 型號： | DM135B |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | LED驅動器 |
| 英文描述： | 16 BIT CONSTANT CURRENT LED DRIVERS WITH 3.3V-5V SUPPLY VOLTAGE |
| 中文描述： | 16位恒流LED驅動與3.3V - 5V供電電壓 |
| 文件頁數： | 14/19頁 |
| 文件大小： | 255K |
| 代理商： | DM135B |
DM134B
、
DM135B
點晶科技股份有限公司
SILICON TOUCH TECHNOLOGY INC.
16-Bit Constant Current LED Drivers
-
13
-
Version
：
A.001
Preliminary
System Configuration Example
[1] Output current (I
OUT
)
Sink current is set by the external resistor as shown in the figure of Iout vs. Rext.
[2] LED supply voltage (V
LED
) setup
V
LED
=
V
CE
( T
r
V
sat
) +
V
f
( LED forward voltage ) +
V
O
( IC output voltage)
To prevent too much power from dissipating by the higher
V
LED
of the device, an
additional R can be used to reduce the Vout when the outputs consume current is as follows:
V
V
LED
R
=
(max)
*
(max)
(min)
Bit
I
V
V
O
O
f
CE
Note
This device has only one ground pin shared by signal, output sink current, and power ground. It is
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.
SERIAL-OUT
V
LED
= 3~4 (V)
OUT15
OUT0
GND
R-EXT
LATCH
CPU
SERIAL-IN
SCAN
CLOCK
SERIAL-OUT
OUT15
OUT0
GND
R-EXT
LATCH
SERIAL-IN
CLOCK
R
V
CE
—
＋
Vf
—
Vo
＋
ENABLE
ENABLE
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