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參數資料
| 型號： | MBI5168CDW |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8-bit Constant Current LED Sink Driver |
| 中文描述： | 8位恒流LED驅動器 |
| 文件頁數： | 11/15頁 |
| 文件大小： | 269K |
| 代理商： | MBI5168CDW |
MBI5168
8-bit Constant Current LED Sink Driver
Adjusting Output Current
The output current of each channel (I
OUT
) is set by an external resistor, R
ext
. The relationship between I
out
and R
ext
is
September
2003, V0.3
- 11 -
V
DS
= 1.0V
0
20
40
60
80
100
120
0
500
1000
1500
2000
R
ext
(
)
2500
3000
3500
4000
I
O
shown in the following figure.
Also, the output current can be calculated from the equation:
V
R-EXT
= 1.253Volt
I
ref
= V
rext
/ R
ext
if another end of the external resistor R
ext
is connected to ground.
I
OUT
= I
ref
x 15 = 1.253Volt / R
ext
x 15.
where R
ext
is the resistance of the external resistor connected to R-EXT terminal and V
R-EXT
is the voltage of R-EXT
terminal. The magnitude of current (as a function of R
ext
) is around 50.52mA at 372
Ω
and 25.26mA at 744
Ω
.
Resistance of the external resistor, R
ext
, in
Ω
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