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參數(shù)資料
| 型號(hào)： | SC620ULTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Octal LED Driver, General Purpose Current Sink with Serial Interface |
| 中文描述： | 八路LED驅(qū)動(dòng)器，通用吸電流的串行接口 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 363K |
| 代理商： | SC620ULTRT |
Application Examples (Cont.)
Backlighting with Series Connected LEDs connected to a Boosted Output Voltage
SC620
VIN
2
SCL
11
SDA
10
EN
3
GND
1
GND
4
GND
9
GND
12
ILED1
5
ILED2
6
ILED3
7
ILED4
8
ILED6
14
ILED7
15
ILED8
16
ILED5
13
1
μ
F
SCL
SDA
EN
LED Backlighting
5V
R
1
R
2
= (3/7)*(R
1
)
Limit SC620 sink pins to < [VIN – 1.5]
+
-
DC/DC Boost Voltage
Boost
limiting
Example Circuit
This application example uses the SC620 to drive 32
LEDs in a 4-in-series by 8-in-parallel arrangement. Other
arrangements of series and parallel combinations are
possible.
To prevent the boost voltage from illuminating the LEDs
while the current sinks are off, the boost voltage must
follow the SC620 in the start-up sequence. The boost
voltage must also power-off before the current sinks turn
off in the shut-down sequence. Protection diodes are
necessary to protect the current sinks from destructive
voltage levels produced by the boost voltage supply.
The operating voltage limit of [VIN - 1.5V] at the sink pins
must be observed to achieve the speci
fi
ed accuracy of the
device.
14
2006 Semtech Corp.
www.semtech.com
POWER MANAGEMENT
SC620
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