Datasheet > SC445

SC445

更新时间： 2024-11-23 12:26:03

品牌	Logo	应用领域
商升特 - SEMTECH		驱动
页数	文件大小	规格书
1页	320K
描述
High Efficiency Integrated Driver for 4-Strings of 150mA LEDs

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SC445 数据手册

SC445

High Eﬃciency Integrated Driver for

4-Strings of 150mA LEDs

POWER MANAGEMENT

Features

Description

The SC445 is a high-eﬃciency multiple string WLED driver

with an integrated boost converter. It operates over a

wide input range from 4.5V to 27V and can sustain fast

Vin transient up to 5V/µs. It can drive up to forty WLEDs in

4 strings with current up to 150mA per string. The string-

to-string current matching is 2% typical, 3% maximum.

The overall eﬃciency is greater than 90% due to the low

current sense voltage and a low-impedance internal pow-

er switch. The wide PWM dimming range boasts a ratio of

500: 1.

 Wide input voltage range from 4.5V to 27V

 Sustain fast Vin ﬂuctuation up to 5v/µs

 42V 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

 Enable analog dimming

 Integrated 3.0A power switch

The 700KHz 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.

 700KHz switching frequency for small size

 Adjustable OVP for cost-eﬀective output cap selection

 Open/short LED protection

 Short LED protection enable/disable

 Thermal protection with auto-recovery

 Thermally enhanced TSSOP-20 EDP package

 Lead-free, Halogen-Free and WeEE/RoHS Compliant

The SC445 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.

Applications

 Medium-sized LCD panel

 Notebook Display

 Automotive Car Navigation Display

 Sub-Notebook and Tablet Computer Displays

 Portable Media Players

The SC445 is available in a thermally-enhanced TSSOP-20

EDP package.

Typical Application Circuit

Vin (4.5V -27V)

VIN

VOUT

4 Strings

SCP_EN

OVPIN

FFLAG

PWM

SC445

IO1-4

IO1- 4

COMP

IOSET

AGND

IOGND

PGND

EDP

Revision 2.1

中文翻译

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与SC445相关器件

型号	品牌	获取价格	描述	数据表
SC446	SEMTECH	获取价格	High Efficiency Integrated Driver for 3-Strings of 100mA LEDs
SC446TETRT	SAMTEC	获取价格	High Efficiency Integrated Driver for 3-Strings of 100mA LEDs
SC-45	COOPER	获取价格	SC Class G, 600Vac/480Vac, 1â2-60A
SC450	SEMTECH	获取价格	Portable IMVP-IV™ and IMVP4+™ Dual Phase Powe
SC4501	SEMTECH	获取价格	2Amp, 2MHz Step-Up Switching Regulator with Soft-Start
SC4501EVB	SEMTECH	获取价格	2Amp, 2MHz Step-Up Switching Regulator with Soft-Start
SC4501MLTRT	SEMTECH	获取价格	2Amp, 2MHz Step-Up Switching Regulator with Soft-Start
SC4501MSETRT	SEMTECH	获取价格	2Amp, 2MHz Step-Up Switching Regulator with Soft-Start
SC4502	SEMTECH	获取价格	1.4Amp, 2MHz Step-Up Switching Regulator with Soft-Start
SC4502EVB	SEMTECH	获取价格	1.4Amp, 2MHz Step-Up Switching Regulator with Soft-Start

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