lt3592emse-trpbf Linear Technology Corporation, lt3592emse-trpbf Datasheet

lt3592emse-trpbf

Manufacturer Part Number

lt3592emse-trpbf

Description

500ma Wide Input Voltage Range Step-down Led Driver With 10 1 Dimming

Manufacturer

Linear Technology Corporation

Datasheet

1.LT3592EMSE-TRPBF.pdf (24 pages)

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FEATURES

APPLICATIONS

TYPICAL APPLICATION

7V TO 32V

Wide Input Voltage Range

Operation from 3.6V to 36V

Resistor Adjustable 400kHz–2.2MHz Switching

Frequency

Shorted and Open LED Protected

Internal Switch Current Sense Resistor

External Resistor Programs LED Current, Pin

Selects 10:1 Ratio

50mA/500mA LED Current Settings

Catch Diode Current Sense to Prevent Runaway at

High V

Small Thermally Enhanced 10-Lead DFN

(2mm × 3mm) and MSOP-10 Packages

Automotive Signal Lighting

Industrial Lighting

Constant-Current, Constant Voltage Supplies

900kHz

BRAKE

140k

50/500mA Two Series Red LED Driver

1μF

SHDN

BRIGHT

LT3592

GND

BOOST

CAP

OUT

200/20mV

–

51k

10k

0.1μF

10μH

0.4Ω

3592 TA01a

4.7μF

Range Step-Down LED Driver

500mA Wide Input Voltage

DESCRIPTION

The LT

verter designed to operate as a constant-current source.

An external sense resistor monitors the output current

allowing accurate current regulation, ideal for driving

high current LEDs. The output current can be dimmed

by a factor of 10 using an external signal for nighttime

brake lights.

The high switching frequency offers several advantages by

permitting the use of a small inductor and small ceramic

capacitors. Small components combined with the LT3592’s

10-pin DFN leadless surface mount package save space and

cost versus alternative solutions. The constant switching

frequency combined with low-impedance ceramic capaci-

tors result in low, predictable output ripple.

A wide input voltage range of 3.6V to 36V makes the

LT3592 useful in a variety of applications. Current mode

PWM architecture provides fast transient response and

cycle-by-cycle current limiting. Thermal shutdown provides

additional protection.

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

All other trademarks are the property of their respective owners.

3592 is a ﬁ xed frequency step-down DC/DC con-

Efﬁ ciency for 2 Red LEDs, L = 10μH, 900kHz

100

with 10:1 Dimming

INPUT VOLTAGE (V)

BRIGHT 500mA

3592 TA01b

LT3592

3592f

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