Datasheet > MBR0520L

MBR0520L

更新时间： 2024-11-18 12:10:19

品牌	Logo	应用领域
凌特 - Linear		二极管光电二极管
页数	文件大小	规格书
20页	207K
描述
True Color PWM Delivers Constant Color with 400:1 Dimming Range

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中文翻译

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数据手册

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MBR0520L 数据手册

LT3474/LT3474-1

Step-Down

1A LED Driver

FEATURES

DESCRIPTION

The LT^®3474/LT3474-1 are ﬁxed frequency step-down

DC/DCconvertersdesignedtooperateasconstant-current

sources. An internal sense resistor monitors the output

current allowing accurate current regulation, ideal for

driving high current LEDs. High output current accuracy

is maintained over a wide current range, from 35mA to

1A, allowing a wide dimming range.

True Color PWM™ Delivers Constant Color with

400:1 Dimming Range

Wide Input Range: 4V to 36V

Up to 1A LED Current

Adjustable 200kHz–2MHz Switching Frequency

Adjustable Control of LED Current

Integrated Boost Diode

High Output Current Accuracy is Maintained

Unique PWM circuitry allows a dimming range of 400:1,

avoiding the color shift normally associated with LED

current dimming.

Over a Wide Range from 35mA to 1A

Open LED (LT3474) and Short-Circuit Protection

High Side Sense Allows Grounded

Cathode Connection

The high switching frequency offers several advantages,

permitting the use of small inductors and ceramic capaci-

tors. Small inductors combined with the 16-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.

Uses Small Inductors and Ceramic Capacitors

LT3474-1 Drives LED Strings Up to 26V

Compact 16-Lead TSSOP Thermally Enhanced

Surface Mount Package

APPLICATIONS

With their wide input range of 4V to 36V, the LT3474/

LT3474-1 regulate a broad array of power sources, from

5V logic rails to unregulated wall transformers, lead acid

batteries and distributed power supplies. A current mode

PWM architecture provides fast transient response and

cycle-by-cycle current limiting. Frequency foldback and

thermal shutdown provide additional protection.

■

Automotive and Avionic Lighting

■

Architectural Detail Lighting

■

Display Backlighting

Constant Current Sources

■

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

True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are

the property of their respective owners. Patent Pending

TYPICAL APPLICATION

Step-Down 1A LED Driver

Efﬁciency

= 12V

5V TO 36V

TWO SERIES CONNECTED

WHITE 1A LEDS

0.22μF

10μH

BOOST

LT3474

2.2μF

SHDN

ONE WHITE 1A LED

BIAS

OUT

REF

DIMMING*

CONTROL

PWM

ADJ

80.6k

0.1μF

2.2μF

LED

GND

LED1

*SEE APPLICATIONS SECTION FOR DETAILS

200

400

LED CURRENT (mA)

800

1000

600

3474 TA01a

3474 G02

3474fd

12 3 4 5 6 7...20

中文翻译

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