Microchip MIC4812 Handleiding

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MIC4812

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 MIC4812 is a high efficiency linear White LED

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

WLEDs for signage lighting. The MIC4812 provides the

highest possible efficiency as this architecture has no

switching losses present in traditional charge pumps or

inductive boost circuits. The MIC4812 provides six linear

drivers which maintain constant current for up to six

WLEDs. It features a typical dropout of 190mV at 100mA.

The MIC4812 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 MIC4812 is available in an 10-pin MSOP ePad

package with a junction temperature range of -40°C to

+125°C.

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 100mA per channel

•Programmable LED current with external resistor

•Dropout of 190mV at 100mA

•Matching better than ±1% (typical)

•Current Accuracy better than ±1% (typical)

•Maintains proper regulation regardless of how many

channels are utilized

•10-pin MSOP with ePadpackage

Applications

•Billboard displays

•Marquee displays

•Instrument displays

•LCD display modules

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Typical Application

High Current Lighting (Six WLEDs)

April 2011M9999-041911-B

Product specificaties