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SC620
Applications Information (continued)
Backlighting with Series Connected LEDs connected
to a Boosted Output Voltage
This 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 may be
necessary to protect the current sinks from destructive
voltage levels produced by the boost voltage supply.
Schottky diodes are shown in the schematic for the
purpose of voltage clamping. These diodes prevent
damage to the current sinks in the event that the sink
turns off while the boost circuit is on.
The operating voltage limit of (V IN - 1.5V) at the sink pins
must be observed to achieve the specified accuracy of the
device.
LED Backlighting
DC/DC Boost Voltage
Boost
limiting
R 2 = (3/7)*(R 1 )
+
-
R 1
Limit SC620 sink pins to < [VIN – 1.5]
5V
2
IN
SC620
ILED1
5
SCL
11
SCL
ILED2
6
1 μ F
SDA
EN
10
3
1
4
9
12
SDA
EN
GND
GND
GND
GND
ILED3
ILED4
ILED5
ILED6
ILED7
ILED8
7
8
13
14
15
16
13
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相关代理商/技术参数
SC620X565 制造商:American Power Conversion Corp (APC by Schneider Electric) 功能描述:APC SMART-UPS SC 620VA, 120V,
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SC6-21 制造商:Vector Electronics & Technology Inc 功能描述:
SC621_09 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump,4 LEDs, 400mA Flash LED Dual LDOs,and SemWire Interface
SC621A 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, Dual LDOs, and I2C Interface
SC621A_09 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, Dual LDOs, and I2C Interface
SC621AEVB 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:LED Light Management Unit Charge Pump, 4 LEDs, 400mA Flash LED, Dual LDOs, and I2C Interface
SC621AULTRT 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Charge Pump, 4 LEDs, 400mA Flash LED, Dual LDOs, and I2C Interface