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參數(shù)資料
| 型號： | ST2221C |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | 16 BIT CONSTANT CURRENT LED DRIVERS |
| 中文描述： | 16位恒流LED驅(qū)動 |
| 文件頁數(shù)： | 13/17頁 |
| 文件大小： | 471K |
| 代理商： | ST2221C |
ST2221C
16-Bit Constant Current LED Drivers
-
12
-
Version
：
1.01
System Configuration Example
[1] Output current (I
OUT
)
Sink current is set by the external resistor as shown in the figure (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 supply voltage)
To prevent too much power dissipated by the device due to higher
V
LED
, an additional R
can be used to reduce the Vout when the outputs consume current:
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 such that the switching noise induced
by the input signals and the output sink current would not cause chip malfunction. To prevent the
drivers’ outputs from damage by overshoot stress, it is also advisable not to turn off the drivers and
scan transistors simultaneously.
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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