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SC440A_10

更新时间: 2024-11-06 06:10:15
品牌 Logo 应用领域
商升特 - SEMTECH 驱动器
页数 文件大小 规格书
21页 391K
描述
High Efficiency Integrated Driver for 6-Strings of 30mA LEDs

SC440A_10 数据手册

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SC440A  
High Efficiency Integrated Driver  
for 6-Strings of 30mA LEDs  
POWER MANAGEMENT  
Features  
Description  
„
„
Wide input range 4.5V to 27V  
42V maximum output voltage with adjustable OVP for  
smaller output capacitor  
Drives up to 72 WLEDs in 6 strings  
Programmable WLED current for up to 30mA per  
string  
1% string-to-string current matching  
2A integrated power switch  
Up to 91% efficiency  
The SC440A is a high-efficiency multiple string WLED  
driver with an integrated boost converter. It operates  
over a wide input range from 4.5V to 27V with a maximum  
output voltage of 42V and a 2A internal power switch.  
„
„
It can drive up to 42V output voltage in 6 strings with  
current up to 30mA per string. The string-to-string current  
matching is 1% typical, 3% maximum and the overall  
efficiency is greater than 90% due to the low current sense  
voltage and a low-impedance internal power switch. The  
wide PWM dimming range boasts a ratio of 500: 1.  
„
„
„
„
„
„
0.2% to 100% PWM dimming  
Analog dimming  
800KHz switching frequency for small external com-  
ponent  
Open/short LED protection  
Short LED protection disable  
<1uA shut-down current  
Thermal protection  
4mm x 4mm x1mm MLPQ-24 package (Pb-free, Halo-  
gen free, WEEE & RoHS compliant)  
The 800kHz switching frequency enables the user to  
optimize the external component sizes for high efficiency.  
When there are fewer LEDs in each string, users can use  
a lower output voltage protection level which yields an  
allowable reduction in associated costs, size and voltage  
ratings of the output capacitor.  
„
„
„
„
„
The SC440A also features a comprehensive open and  
short circuit LED protection functions. It disables the  
corresponding strings with LED open or LED short  
conditions while keeping other strings under normal  
operation. This feature allows LCD panels to remain  
viewable even under LED failure, wire disconnect, or short-  
circuit conditions. The short LED protection function can  
be disabled. The internal thermal shutdown protects the  
IC from overheating at abnormal conditions. The SC440A  
is available in a common 4mm x 4mm x1mm MLPQ-24  
package.  
Applications  
„
„
„
„
„
„
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Medium-sized LCD panel  
Notebook Display  
White LED Power Supplies  
Sub-Notebook and Tablet Computer Displays  
Portable Media Players  
LCD Monitors  
Digital Video Cameras  
Typical Application Circuit  
Vin (4.5V -27V)  
1
2
SW  
SW  
VIN  
VOUT  
6 Strings  
SCP_EN  
EN  
OVPIN  
FFLAG  
PWM  
OVPRTN  
IO1-6  
12  
SC440A  
6
COMP  
IOSET  
AGND  
IOGND  
SS  
PGND  
PGND  
EDP  
www.semtech.com  
Jan. 12, 2010  
1

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