lt3475efe-trpbf Linear Technology Corporation, lt3475efe-trpbf Datasheet

lt3475efe-trpbf

Manufacturer Part Number

lt3475efe-trpbf

Description

Dual Step-down 1.5a Led Driver

Manufacturer

Linear Technology Corporation

Datasheet

1.LT3475EFE-TRPBF.pdf (20 pages)

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APPLICATIO S

FEATURES

■

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

TYPICAL APPLICATIO

2.2μF

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

True Color PWM

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

Anti-Phase Switching Reduces Ripple

Uses Small Inductors and Ceramic Capacitors

Available in the Compact 20-Lead TSSOP Thermally

Enhanced Surface Mount Package

Automotive and Avionic Lighting

Architectural Detail Lighting

Display Backlighting

Constant-Current Sources

*SEE APPLICATIONS SECTION FOR DETAILS

5V TO 36V

CURRENT

1.5A LED

10μH

0.1μF

Dual Step-Down 1.5A LED Driver

*DIMMING

CONTROL

0.22μF

4.7μF

Delivers Constant Color with

BOOST1

SW1

OUT1

LED1

PWM1

REF

ADJ1

LT3475

GND

SHDN

BOOST2

PWM2

OUT2

LED2

SW2

ADJ2

DIMMING*

CONTROL

24.3k

0.22μF

= 600kHz

1.5A LED

CURRENT

0.1μF

10μH

3475 TA01

2.2μF

DESCRIPTIO

The LT

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-

lows grounded cathode LED operation. High output current

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.

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.

With its wide input range of 4V to 36V, the LT3475/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.

3475/LT3475-1 are dual step-down DC/DC

= 12V

Dual Step-Down

0.5

LT3475/LT3475-1

1.5A LED Driver

LED CURRENT (A)

Efﬁ ciency

TWO SERIES CONNECTED

WHITE 1.5A LEDS

SINGLE WHITE 1.5A LED

3475 TA01b

1.5

3475fb

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