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參數資料
| 型號： | MBI5170CN |
| 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驅動器 |
| 文件頁數： | 16/24頁 |
| 文件大小： | 400K |
| 代理商： | MBI5170CN |
MBI5170 8-Bit Constant Current LED Sink Driver with Gain Control
Adjusting Output Current
MBI5170 scales up the reference current I
ref
set by the external resistor R
ext
to sink a current I
out
at each output port.
August 2004, VA.00
- 16 -
Users can follow the below formulas to calculate the output current I
out
in the saturation region:
V
R-EXT
= 1.25Volt x VG
I
rext
= V
R-EXT
/ R
ext
if another end of the external resistor R
ext
is connected to ground.
I
out
= I
rext
x 15 x 3^(CM-1)
where R
ext
is the resistance of the external resistor connected to the R-EXT terminal, and V
R-EXT
is the voltage of
the R-EXT terminal and controlled by the programmable voltage gain VG, which is defined by the Configuration
Code. The Current Multiplier CM would determine that the ratio I
out
/I
rext
is 15 or 5. After power-on, the default
value of VG is 127/128 = 0.992 and the default value of CM is 1, so that the ratio I
out
/I
rext
is 15. Based on the
default VG and CM,
V
R-EXT
= 1.25Volt x 127/128= 1.24Volt
I
out
= (1.24Volt / R
ext
) x 15
Hence, the default magnitude of current is around 50mA at 372
Ω
and 25mA at 744
Ω
. The default relationship after
power-on between I
out
and R
ext
is shown in the following figure.
Default Relationship Curve Between I
out
and R
ext
After Power-On
0
20
40
60
80
100
120
140
0
500
1000
1500
2000
R
ext
(
Ω
)
2500
3000
3500
4000
I
o
V
DS
= 1.0V
V
DD
= 5.0V
VG = 127/128
CM = 1
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