SC446

更新时间:2024-09-18 07:52:41
品牌:SEMTECH
描述:High Efficiency Integrated Driver for 3-Strings of 100mA LEDs

SC446 概述

High Efficiency Integrated Driver for 3-Strings of 100mA LEDs 高效集成驱动器,用于100mA的LED的3串

SC446 数据手册

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SC446  
High Eciency Integrated Driver for  
3-Strings of 100mA LEDs  
POWER MANAGEMENT  
Features  
Description  
 
 
 
 
Wide input voltage range from 4.5V to 27V  
36V maximum output voltage  
The SC446 is a high-e"ciency multiple string WLED driver  
with an integrated boost converter. It operates over a  
wide input range from 4.5V to 27V with a maximum out-  
put voltage of 36V and a 2.5A internal power switch. It  
can drive up to thirty WLEDs in 3 strings with current up  
to 100mA per string. The string-to-string current match-  
ing is 2% typical, 3% maximum. The overall e"ciency 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.  
Drives up to 30 WLEDs in 3 strings  
Programmable LED current for up to 100mA per  
string  
 
 
 
 
 
 
 
 
 
 
 
+/- 2% string-to-string current matching  
Up to 90% eciency  
Wide 0.2% to 100% PWM dimming range  
Possible analog dimming  
Integrated 2.5A power switch  
700kHz switching frequency for small size  
Adjustable OVP for cost-e!ective output cap selection  
Open/short LED protection  
The 700kHz switching frequency enables the user to op-  
timize the external component sizes for e"ciency. When  
there are fewer than 10 LEDs in each string, users can ad-  
just the output voltage protection yielding an allowable  
reduction in associated costs, size and voltage ratings of  
the output capacitor.  
Thermal protection with auto-recovery  
Thermally enhanced TSSOP-16 EDP package  
Pb Free, Halogen Free, andWEEE/RoHS Compliant  
The SC446 also features comprehensive open and short-  
circuit LED protection functions. It disables the corre-  
sponding strings with LED open or LED short conditions  
while maintaining normal operation of other, una!ected  
LED strings. This feature allows LCD panels to remain  
viewable even under LED failure, wire disconnect, or  
short-circuit conditions. The internal thermal shutdown  
protects the IC from overheating at abnormal conditions.  
Applications  
 
 
 
 
 
Medium-sized LCD panel  
Notebook Display  
Automotive Car Navigation Display  
Sub-Notebook and Tablet Computer Displays  
Portable Media Players  
The SC446 is available in a thermally-enhanced TSSOP-16  
EDP package.  
Typical Application Circuit  
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www.semtech.com  
January 28, 2010  
1

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