- 您現在的位置：買賣IC網 > PDF目錄374728 > SC441 (Semtech Corporation) High Effi ciency Integrated Driver for 4-Strings of 150mA LEDs PDF資料下載
參數資料
| 型號： | SC441 |
| 廠商： | Semtech Corporation |
| 英文描述： | High Effi ciency Integrated Driver for 4-Strings of 150mA LEDs |
| 中文描述： | 高艾菲布缺陷集成驅動4的150mA的LED的弦 |
| 文件頁數： | 1/1頁 |
| 文件大小： | 67K |
| 代理商： | SC441 |
High Efficiency Integrated Driver for
4-Strings of 150mA LEDs
SC441
POWER MANAGEMENT
Features
April 26, 2007
1
Applications
Medium-sized LCD panel
Notebook Display
Automotive Car Navigation Display
Sub-Notebook and Tablet Computer Displays
Portable Media Players
Description
Wide input voltage range from 4.5V to 21V
36V maximum output voltage
Drives up to 40 WLEDs in 4 strings
Programmable LED current for up to 150mA per
string
+/- 2% string-to-string current matching
Up to 90% efficiency
Wide 0.2% to 100% PWM dimming range
Possible analog dimming
Integrated 2.5A power switch
800kHz switching frequency for small size
Adjustable OVP for cost-effective output cap selection
Open/short LED protection
Thermal protection with auto-recovery
Thermally enhanced TSSOP-20 EDP package
Fully WEEE and RoHS compliant
The SC441 is a high-efficiency multiple string WLED driver
with an integrated boost converter. It operates over a
wide input range from 4.5V to 21V with a maximum out-
put voltage of 36V and a 2.5A internal power switch. It
can drive up to forty WLEDs in 4 strings with current up
to 150mA per string. The string-to-string current match-
ing is 2% typical, 3% maximum. 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.
The 800kHz switching frequency enables the user to op-
timize the external component sizes for efficiency. 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.
The SC441 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, unaffected
LED strings. This feature allows LCD panels to remain view-
able even under LED failure, wire disconnect, or short-cir-
cuit conditions. The internal thermal shutdown protects
the IC from overheating at abnormal conditions.
The SC441 is available in a thermally-enhanced TSSOP-20
EDP package.
4
VOUT
SS
SS
PGND
IOSET
IIO1-4
COMP
OVPIN
AGND
VIN
SW
PWM
EN
OVPRTN
SW
FFLAG
PGND
IOGND
SC441
4 Strings
1
10
Vin (4.5V -21V)
2
EDP
Typical Application Circuit
相關PDF資料 |
PDF描述 |
|---|---|
| SC4431CSK-X | Shunt Regulator With Open Collector Output |
| SC4431 | SHUNT REGULATOR WITH OPEN COLLECTOR OR OUTPUT |
| SC4431CSK-0.5TR | SHUNT REGULATOR WITH OPEN COLLECTOR OR OUTPUT |
| SC4431CSK-1TR | SHUNT REGULATOR WITH OPEN COLLECTOR OR OUTPUT |
| SC4431CSK-2TR | SHUNT REGULATOR WITH OPEN COLLECTOR OR OUTPUT |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SC44-1 | 制造商:Thomas & Betts 功能描述:DEAD- END BRACKET 制造商:Belden Inc 功能描述: |
| SC441303MFU | 制造商:Freescale Semiconductor 功能描述: |
| SC441400CFUER | 制造商:Freescale Semiconductor 功能描述:68HC05B6 LEAD FREE |
| SC441401CFUER | 制造商:Freescale Semiconductor 功能描述:68HC05B6 LEAD FREE |
| SC441A | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Efficiency Integrated Driver for 4-Strings of 150mA LEDs |
發布緊急采購，3分鐘左右您將得到回復。