Használati útmutató Microchip MIC4811

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Oldal 1/12
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 +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 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
____________________________________________________________________________________________________________
Typical Application
High Current Lighting (Six WLEDs)
April 2011 M9999-041411-B

Termékspecifikációk

Márka: Microchip
Kategória: nincs kategorizálva
Modell: MIC4811

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