LT3590 Просмотр технического описания (PDF) - Linear Technology

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LT3590

48V Buck Mode LED Driver in SC70 and 2mm x 2mm DFN

Linear Technology 

FEATURES

■ 4.5V to 55V Input Voltage Range

■ Up to 50mA LED Current

■ 80mA, 55V Switch

■ Internal Schottky Diode

■ 15μA Supply Current in Shutdown

■ 500μA Supply Current Operating, Not Switching

■ Switching Frequency: 850kHz

■ 200mV Feedback Voltage with ±5% Accuracy

■ CTRL Input Performs Dimming and Shutdown

■ 91% Efficiency (10 LEDs, 50mA)

■ Requires Only 1μF Output Capacitor

■ 8-Lead SC70 Package

■ 6-Lead 2mm × 2mm DFN Package

APPLICATIONS

■ LED Fixed Signage

■ Traffic Signs

■ Neon Sign Replacement

LT3590

48V Buck Mode

LED Driver in SC70

and 2mm x 2mm DFN

DESCRIPTION

The LT®3590 is a fixed frequency buck mode converter

specifically designed to drive up to 10 LEDs in series from

a 48V DC source. Series connection of the LEDs provides

identical LED currents of up to 50mA, resulting in uniform

brightness and eliminating the need for ballast resistors.

A fixed frequency, current mode architecture results in

stable operation over a wide range of input voltage and

output voltage.

The high switching frequency of 850kHz permits the use

of tiny, low profile inductors and capacitors. A single pin

performs both shutdown and accurate LED dimming

control. The power switch, Schottky diode and control

circuitry are all contained inside a space saving SC70

package or 2mm × 2mm DFN package to allow a small

converter footprint and lower parts cost.

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATION

VIN

48V

CONTROL

Buck Mode Driver for Ten White LEDs

1μF

50mA

4Ω

1μF

0.1μF

VIN

LED

CTRL

LT3590

VREG

SW

GND

470μH

3590 TA01a

Conversion Efficiency

100

90

80

70

60

50

40

0

10

20

30

40

50

LED CURRENT (mA)

3590 TA01b

3590f

1

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