Microchip MIC4811 Handleiding

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MIC4811

High Current 6 Channel Linear WLED

Driver with DAM™ and Ultra Fast

PWM™ Control

Ultra Fast PWM, DAM and Dynamic Average Matching are trademark of Micrel, Inc.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

General Description

The MIC4811 is a high efficiency linear White LED

(WLED) driver designed to drive up to six high current

WLEDs for signage lighting. The MIC4811 provides the

highest possible efficiency as this architecture has no

switching losses present in traditional charge pumps or

inductive boost circuits. The MIC4811 provides six linear

drivers which maintain constant current for up to six

WLEDs. It features a typical dropout of 100mV at 50mA.

The MIC4811 features Dynamic Average Matching™

(DAM™) which is specifically designed to provide optimum

matching across all WLEDs. The high accuracy (±1%

typical) current regulated WLED channels ensure uniform

display illumination under all conditions. The brightness is

controlled through an Ultra Fast PWM™ interface

operating down to less than 1% duty cycle.

The MIC4811 is available in an 10-pin MSOP package

with a junction temperature range of -40° °C to +125C.

Datasheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

•High Efficiency (no Voltage Boost losses)

•Ultra Fast PWM™ control (200Hz to 500kHz)

•Input voltage range: 3.0V to 5.5V

•LED current range up to 50mA per channel

•Programmable LED current with external resistor

•Dropout of 100mV at 50mA

•Matching better than ±1% (typical)

•Current Accuracy better than ±1% (typical)

•Maintains proper regulation regardless of how many

channels are utilized

•10-pin MSOP package

Applications

•Billboard displays

•Marquee displays

•Instrument displays

•LCD display modules

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Typical Application

High Current Lighting (Six WLEDs)

April 2011M9999-041411-B

Product specificaties