EMZA500ADA470MF80G datasheet(1/17 Pages) ALLEGRO

Part #	EMZA500ADA470MF80G

Description	Constant-Current 3-Ampere PWM Dimmable Buck Regulator LED Driver

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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Description

The A6211 is a single IC switching regulator that provides

constant-current output to drive high-power LEDs. It integrates

a high-side N-channel DMOS switch for DC-to-DC step- down

(buck) conversion. A true average current is output using a

cycle-by-cycle, controlled on-time method.

Output current is user-selectable by an external current sense

resistor. Output voltage is automatically adjusted to drive

various numbers of LEDs in a single string. This ensures the

optimal system efficiency.

LED dimming is accomplished by a direct logic input pulse

width modulation (PWM) signal at the enable pin.

Thedeviceisprovidedinacompact8-pinnarrowSOICpackage

(suffix LJ) with exposed pad for enhanced thermal dissipation.

It is lead (Pb) free, with 100% matte tin leadframe plating.

A6211-DS

Features and Benefits

• Supply voltage 6 to 48 V

• True average output current control

• 3.0 A maximum output over operating temperature range

• Cycle-by-cycle current limit

• Integrated MOSFET switch

• Dimming via direct logic input or power supply voltage

• Internal control loop compensation

• Undervoltage lockout (UVLO) and thermal shutdown

protection

• Low power shutdown (1 μA typical)

• Robust protection against:

▫ Adjacent pin-to-pin short

▫ Pin-to-GND short

▫ Component open/short faults

Constant-Current 3-Ampere PWM Dimmable

Buck Regulator LED Driver

Package 8-pin SOICN with exposed

thermal pad (suffix LJ):

Applications:

• General Illumination

• Scanners and multi-function printers (light bars)

• Architectural lighting

• Industrial Lighting

• Display case lighting / MR16

Typical Application Circuit

Not to scale

A6211

C1

R1

GND

VIN

VIN (6 to 48 V)

1

2

3

4

8

7

6

5

SW

GND

VCC

A6211

BOOT

TON

EN

CS

C5

C4

D1

L1

LED+

LED–

RSENSE

EN

Enable/PWM Dimming

(100 Hz to 2 kHz)

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