Datasheet > LT3475IFE-1-PBF

LT3475IFE-1-PBF

更新时间： 2024-12-01 05:43:31

品牌	Logo	应用领域
凌特 - Linear		驱动器
页数	文件大小	规格书
20页	233K
描述
Dual Step-Down l 1.5A LED Driver

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中文翻译

获取价格

数据手册

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LT3475IFE-1-PBF 数据手册

LT3475/LT3475-1

Dual Step-Down

1.5A LED Driver

DESCRIPTIO

FEATURES

True Color PWM^TMDelivers Constant Color with

The LT^®3475/LT3475-1 are dual step-down DC/DC

converters designed to operate as a constant-current

source. An internal sense resistor monitors the output

current allowing accurate current regulation ideal for

driving high current LEDs. The high side current sense al-

lowsgroundedcathodeLEDoperation.Highoutputcurrent

accuracy is maintained over a wide current range, from

50mA to 1.5A, allowing a wide dimming range. Unique

PWM circuitry allows a dimming range of 3000:1, avoid-

ing the color shift normally associated with LED current

dimming.

■

3000:1 Dimming Range

■

Wide Input Range: 4V to 36V Operating, 40V

Maximum

■

Accurate and Adjustable Control of LED Current

from 50mA to 1.5A

■

High Side Current Sense Allows Grounded Cathode

LED Operation

■

Open LED (LT3475) and Short Circuit Protection

■

LT3475-1 Drives LED Strings Up to 25V

■

Accurate and Adjustable 200kHz to 2MHz

Switching Frequency

The high switching frequency offers several advantages,

permitting the use of small inductors and ceramic capaci-

tors. Small inductors combined with the 20 lead TSSOP

surface mount package save space and cost versus

alternative solutions. The constant switching frequency

combined with low-impedance ceramic capacitors result

in low, predictable output ripple.

■

Anti-Phase Switching Reduces Ripple

■

Uses Small Inductors and Ceramic Capacitors

■

Available in the Compact 20-Lead TSSOP Thermally

Enhanced Surface Mount Package

APPLICATIO S

■

Automotive and Avionic Lighting

Withitswideinputrangeof4Vto36V,theLT3475/LT3475-1

regulate a broad array of power sources. A current mode

PWM architecture provides fast transient response and

cycle-by-cycle current limiting. Frequency foldback and

thermal shutdown provide additional protection.

■

Architectural Detail Lighting

■

Display Backlighting

Constant-Current Sources

■

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners. Patents Pending.

TYPICAL APPLICATIO

Dual Step-Down 1.5A LED Driver

Efﬁciency

5V TO 36V

4.7μF

SHDN

BOOST2

= 12V

TWO SERIES CONNECTED

WHITE 1.5A LEDS

BOOST1

0.22μF

LT3475

10μH

SW1

SW2

SINGLE WHITE 1.5A LED

OUT1

LED1

OUT2

LED2

*DIMMING

CONTROL

DIMMING*

CONTROL

PWM1

PWM2

REF

2.2μF

0.1μF

2.2μF

0.1μF

1.5A LED

CURRENT

1.5A LED

CURRENT

ADJ1

ADJ2

24.3k

GND

0.5

1.5

LED CURRENT (A)

3475 TA01

*SEE APPLICATIONS SECTION FOR DETAILS

= 600kHz

3475 TA01b

3475fb

12 3 4 5 6 7...20

中文翻译

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与LT3475IFE-1-PBF相关器件

型号	品牌	获取价格	描述	数据表
LT3475IFE-1-TRPBF	Linear	获取价格	Dual Step-Down l 1.5A LED Driver
LT3475IFE-PBF	Linear	获取价格	Dual Step-Down l 1.5A LED Driver
LT3475IFE-TRPBF	Linear	获取价格	Dual Step-Down l 1.5A LED Driver
LT3476	Linear	获取价格	High Current Quad Output LED Driver
LT3476	SHINDENGEN	获取价格
LT3476	ADI	获取价格	高电流四通道输出 LED 驱动器
LT3476EUHF	Linear	获取价格	High Current Quad Output LED Driver
LT3476EUHF#PBF	Linear	获取价格	LT3476 - High Current Quad Output LED Driver; Package: QFN; Pins: 38; Temperature Range: -
LT3476EUHF#TRPBF	Linear	获取价格	LT3476 - High Current Quad Output LED Driver; Package: QFN; Pins: 38; Temperature Range: -
LT3476EUHFPBF	Linear	获取价格	暂无描述

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