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SC4509EVB

更新时间： 2024-11-23 04:05:23

品牌	Logo	应用领域
商升特 - SEMTECH		转换器光电二极管升压转换器
页数	文件大小	规格书
15页	411K
描述
Highly Integrated Step-Up Converter for White LED Applications in MLPD-W8-2x2

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SC4509EVB 数据手册

SC4509

Highly Integrated Step-Up Converter for

White LED Applications in MLPD-W8-2x2

POWER MANAGEMENT

Description

Features

The SC4509 is a highly integrated step-up DC/DC convert- V^INrange: 2.7V — 10V

er targeted for white LED backlighting applications. It is Integrated Schottky diode

designed to drive up to ﬁve LEDs with a wide input voltage 81% efﬁciency

range of 2.7 to 10 volts. Designed for 20V output voltage, Requires only 4 external components

the SC4509 operates with a constant 1.2MHz PWM fre- Up to 20V of output voltage

quency. To optimize efﬁciency, the feedback voltage is set 30mA maximum LED current

to only 199mV, minimizing the power loss in the current Open LED protection (OVP)

setting resistor. The product requires only four external 1.2MHz PWM switching frequency

components (CIN, COUT, L and R_SET), making it ideal for Low feedback voltage (20OmV typical)

applications that require low cost and minimal PCB area. Wide range of PWM dimming

Drives up to 5 LEDs

The SC4509 offers current limit and over-voltage protec- 500mA switch current limit

tion (OVP) to safeguard the device under extreme operat- 220nF output capacitor

ing conditions. If the LEDs become disconnected or fail in Available in 2mm x 2mm x 0.75mm MLPD-W8 and

an open state condition, OVP circuitry will be activated to

SOT23-6 packages

shut down the device. The EN/SS pin allows the device Packages are fully WEEE and RoHS compliant

to be placed in power-down mode, disabling the control

circuitry to reduce input current.

Applications

Digital Video Cameras

White LED Backlight Driver

OLED Display Driver

Portable Media Players

GPS Receivers

Cellular Phones

PDAs and Handheld Computers

Typical Application Circuit

Vin

22μH

LED1

LED2

0.22μF

LED3

LED4

VIN

SC4509

EN/SS

1μF

March 26, 2007

www.semtech.com

12 3 4 5 6 7...15

中文翻译

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与SC4509EVB相关器件

型号	品牌	获取价格	描述	数据表
SC4509SKTRT	SEMTECH	获取价格	Highly Integrated Step-Up Converter for White LED Applications in MLPD-W8-2x2
SC4509WLTRT	SEMTECH	获取价格	Highly Integrated Step-Up Converter for White LED Applications in MLPD-W8-2x2
SC451	SEMTECH	获取价格	Portable IMVP-IV? and IMVP-IV+? Single Phase Power Supply Controller
SC4510	SEMTECH	获取价格	High Performance Synchronous Buck Controller With Reference Tracking
SC4510ITSTR	SEMTECH	获取价格	High Performance Synchronous Buck Controller With Reference Tracking
SC4510ITSTRT	SEMTECH	获取价格	High Performance Synchronous Buck Controller With Reference Tracking
SC4517A	SEMTECH	获取价格	1.25MHz, 1.5A Step-Down Switching Regulator
SC4517AEVB	SEMTECH	获取价格	1.25MHz, 1.5A Step-Down Switching Regulator
SC4517AIML18TRT	SEMTECH	获取价格	Switching Regulator, Current-mode, 1.5A, 1600kHz Switching Freq-Max, PDSO8, 3 X 3 MM, ROHS
SC4517AIML33TRT	SEMTECH	获取价格	Switching Regulator, Current-mode, 1.5A, 1600kHz Switching Freq-Max, PDSO8, 3 X 3 MM, ROHS

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