SC446 [SEMTECH]
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
| 型号： | SC446 |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | High Efficiency Integrated Driver for 3-Strings of 100mA LEDs |
| 文件： | 总1页 (文件大小：44K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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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