SC440

更新时间： 2024-09-16 04:05:23

品牌	Logo	应用领域
商升特 - SEMTECH		驱动器
页数	文件大小	规格书
1页	62K
描述
High Effi ciency Integrated Driver for 6-Strings of 30mA LEDs

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中文翻译

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SC440 数据手册

SC440

High Eﬃciency Integrated Driver

for 6-Strings of 30mA LEDs

POWER MANAGEMENT

Features

Description

Wide input range 4.5V to 21V

36V maximum output voltage with adjustable OVP for

smaller output capacitor

Drives up to 60 WLEDs in 6 strings

Programmable WLED current for up to 30mA per

string

1% string-to-string current matching

2.5A integrated power switch

Up to 91% eﬃciency

The SC440 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 output

voltage of 36V and a 2.5A internal power switch.

It can drive up to 36V output voltage in 6 strings with

current up to 30mA per string. The string-to-string current

matching is 1% typical, 3% maximum and 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.

0.2% to 100% PWM dimming

Analog dimming

800KHz switching frequency for small external com-

ponent

Open/short LED protection

Short LED protection disable

<1uA shut-down current

Thermal protection

4mm x 4mm x1mm MLPQ-24 package (WEEE & RoHS

compliant)

The 800kHz switching frequency enables the user to

optimize the external component sizes for high eﬃciency.

When there are fewer LEDs in each string, users can use

a lower output voltage protection level which yields an

allowable reduction in associated costs, size and voltage

ratings of the output capacitor.

The SC440 also features a comprehensive open and

short circuit LED protection functions. It disables the

corresponding strings with LED open or LED short

conditions while keeping other strings under normal

operation. This feature allows LCD panels to remain

viewable even under LED failure, wire disconnect, or short-

circuit conditions. The short LED protection function can

be disabled. The internal thermal shutdown protects the

IC from overheating at abnormal conditions. The SC440

is available in a common 4mm x 4mm x1mm MLPQ-24

package.

Applications

Medium-sized LCD panel

Notebook Display

White LED Power Supplies

Sub-Notebook and Tablet Computer Displays

Portable Media Players

LCD Monitors

Digital Video Cameras

Typical Application Circuit

Vin (4.5V - 21V)

VIN

VOUT

6 Strings

SCP_EN

OVPIN

FFLAG

OVPRTN

IO1-6

PWM

SC440

COMP

IOSET

AGND

IOGND

PGND

EDP

April 20 2007

中文翻译

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与SC440相关器件

型号	品牌	获取价格	描述	数据表
SC440A	SEMTECH	获取价格	High Effi ciency Integrated Driver for 6-Strings of 30mA LEDs
SC440A_10	SEMTECH	获取价格	High Efficiency Integrated Driver for 6-Strings of 30mA LEDs
SC440AEVB	SEMTECH	获取价格	High Efficiency Integrated Driver for 6-Strings of 30mA LEDs
SC440AMLTRT	SEMTECH	获取价格	High Efficiency Integrated Driver for 6-Strings of 30mA LEDs
SC441	SEMTECH	获取价格	High Effi ciency Integrated Driver for 4-Strings of 150mA LEDs
SC441A	SEMTECH	获取价格	High Efficiency Integrated Driver for 4-Strings of 150mA LEDs
SC441A_10	SEMTECH	获取价格	High Efficiency Integrated Driver for 4-Strings of 150mA LEDs
SC441AEVB	SEMTECH	获取价格	High Efficiency Integrated Driver for 4-Strings of 150mA LEDs
SC441ATETRT	SEMTECH	获取价格	High Efficiency Integrated Driver for 4-Strings of 150mA LEDs
SC441C	SEMTECH	获取价格	High Efficiency Integrated Driver for 4-Strings of 150mA LEDs

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