LED5000 datasheet(1/52 Pages) STMICROELECTRONICS

部件名	LED5000

功能描述	3 A monolithic step-down current source with dimming capability

PDF	52 Pages

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制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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1 / 52 page

This is information on a product in full production.

January 2013

Doc ID 023951 Rev 1

1/51

51

LED5000

3 A monolithic step-down current source with dimming capability

Datasheet

− production data

Features

■ 5.5 V to 48 V operating input voltage range

■ 850 kHz fixed switching frequency

■ 200 mV typ. current sense voltage drop

■ buck / buck-boost / floating boost topologies

■ PWM dimming

■ ±3% output current accuracy over temperature

■ 200 mW typical RDSON

■ Peak current mode architecture

■ Short-circuit protection

■ Compliant with ceramic output capacitors

■ Inhibit for zero current consumption

■ Thermal shutdown

Applications

■ High brightness LED driving

■ Street lighting

■ Signage

■ Halogen bulb replacement

■ General lighting

Description

The LED5000 is an 850 kHz fixed switching

frequency monolithic step-down DC-DC converter

designed to operate as a precise constant current

source with an adjustable current capability up to

3 A DC. The embedded PWM dimming circuitry

features LED brightness control. The regulated

output current level is set by connecting a sensing

resistor to the feedback pin. The 200 mV typical

RSENSE voltage drop enhances performance in

terms of efficiency. The size of the overall

application is minimized thanks to the high

switching frequency and its compatibility with

ceramic output capacitors. The device is fully

protected against overheating, overcurrent and

output short-circuit. The LED5000 is available in

an HSOP8 package.

Figure 1.

Typical application circuit

HPSO8

CIN

CFLT

VIN

GND

DIM

RS

COUT

U1

LED5000

BOOT

1

DIM

2

INH

3

COMP

4

GND

6

SW

8

VIN

7

FB

5

L

AM13485v1

www.st.com

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