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參數(shù)資料
| 型號(hào)： | MBI5170CP |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8-Bit Constant Current LED Sink Driver with Gain Control |
| 中文描述： | 8位恒流增益控制LED驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大小： | 400K |
| 代理商： | MBI5170CP |
MBI5170 8-Bit Constant Current LED Sink Driver with Gain Control
August 2004, VA.00
- 15 -
Operation Principle
Constant Current
In LED display applications, MBI5170 provides nearly no current variations from channel to channel and from IC to
IC. This can be achieved by:
1) While I
OUT
≦
100mA, the maximum current skew between channels is less than
±
3%, and that between IC
’
s is
less than
±
6%.
2) In addition, the characteristics curve of output stage in the saturation region is flat and users can refer to the
output characteristics figure as shown below. Thus, the output current can be kept constant regardless of the
variations of LED forward voltage (Vf).
I
out
v.s. V
DS
curve for various R
ext
(V
DD
= 5.0V)
0
20
40
60
80
100
120
140
0.0 0.1 0.2 0.3
0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1
1.2 1.3 1.4 1.5
V
DS
(V)
I
o
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