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參數資料
| 型號： | SC4538EVB |
| 廠商： | Semtech Corporation |
| 英文描述： | High Effi ciency Boost Converter for up to 10 LEDs |
| 中文描述： | 高艾菲布缺陷升壓多達10個LED轉換器 |
| 文件頁數： | 1/14頁 |
| 文件大?。?/td> | 247K |
| 代理商： | SC4538EVB |
POWER MANAGEMENT
1
High Efficiency Boost Converter
for up to 10 LEDs
Typical Application Circuit
July 11, 2007
OUT
LX
BL
C
IN
2.8 to
5.5V
IN
EN
ISET
GND
COMP
Enable and
PWM dimming
R
ISET
C
COMP
L1
D
C
OUT
R
COMP
SC4538
Applications
White LED Display Backlight Driver
Smartphones and PDAs
Cellular Handsets
MP3 and Portable Media Players
DSC, GPS, Satellite Radio, Game Players
SC4538
Features
Input voltage range — 2.8V to 5.5V
Current-mode PWM control — 800kHz
Programmable LED current up to 30mA
Soft-start to reduce in-rush current
PWM dimming — 100Hz to 50kHz
Analog and filtered-PWM dimming at ISET
Over-voltage protection — 38V (min.)
Under-voltage lockout (UVLO)
Thermal shutdown
Shutdown current — <1μA
Ultra-thin package — 2mm x 2mm x 0.6mm
Lead-free package, WEEE and RoHS compliant
Description
The SC4538 is designed to regulate current for a series
chain of white LEDs in LCD backlighting applications
where small size and high efficiency are priorities. This
device integrates an 800kHz current-mode PWM boost
converter and a 30mA programmable low dropout current
sink regulator.
An external resistor sets the LED current up to 30mA.
PWM dimming (100Hz to 50kHz) may be applied directly
to the enable (EN) pin, or dimming can be controlled by
applying an analog signal to the ISET circuit. The SC4538
drives a string of up to 10 white LEDs with a forward
voltage of 3.8V or less. The current regulator protects
against shorts between the BL and OUT pins and also
eliminates backlight glow during shutdown when using
LEDs with high leakage. Under-voltage lockout and
thermal shutdown provide additional protection. A small
external capacitor and series resistor control soft-start and
loop compensation. Over-voltage detection protects the
SC4538 if the LED pin is floating or shorted to ground.
The SC4538 is available in an MLPD-8 pin 2mmx 2xmm
0.6mm package, with a rated temperature range of -40°C
to +85°C.
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| SC4538ULTRT | High Effi ciency Boost Converter for up to 10 LEDs |
| SC4539 | High Effi ciency Boost Converter for up to 6 LEDS |
| SC4539EVB | High Effi ciency Boost Converter for up to 6 LEDS |
| SC4539ULTRT | High Effi ciency Boost Converter for up to 6 LEDS |
| SC453 | Portable, VID Programmed Single Phase Power Supply Controller |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SC4538UL.TRT | 制造商:SEMTECH 功能描述:I.C. |
| SC4538ULTRT | 功能描述:IC LED DRIVR WHITE BCKLGT MLPD-8 RoHS:是 類別:集成電路 (IC) >> PMIC - LED 驅動器 系列:- 標準包裝:6,000 系列:- 恒定電流:- 恒定電壓:- 拓撲:開路漏極，PWM 輸出數:4 內部驅動器:是 類型 - 主要:LED 閃爍器 類型 - 次要:- 頻率:400kHz 電源電壓:2.3 V ~ 5.5 V 輸出電壓:- 安裝類型:表面貼裝 封裝/外殼:8-VFDFN 裸露焊盤 供應商設備封裝:8-HVSON 包裝:帶卷 (TR) 工作溫度:-40°C ~ 85°C 其它名稱:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
| SC4539 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Effi ciency Boost Converter for up to 6 LEDS |
| SC4539_08 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Effi ciency Boost Converter for up to 6 LEDS |
| SC4539EVB | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:High Effi ciency Boost Converter for up to 6 LEDS |
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