Microchip MIC4801 Manual

Microchip Ikke kategoriseret MIC4801

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MIC4801
High Efficiency 600mA Single Channel
Linear WLED Driver with
Ultra Fast PWM™ Control
Ultra Fast PWM is a 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
January 2011 M9999-011811-A
General Description
The MIC4801 is a high efficiency White LED (WLED)
driver designed to drive a single LED up to 600mA. The
MIC4801 constant current driver is designed to drive high
power LED’s in various lighting applications. The MIC4801
provides the highest possible efficiency as this architecture
has no switching losses present in traditional charge
pumps or inductive boost circuits. It features a typical
dropout of 130mV at 400mA. This allows the LEDs to be
driven directly from the voltage source eliminating
switching noise/losses present with the use of boost
circuitry. The high accuracy (±1% typical) current regulated
WLED channel ensures uniform display illumination under
all conditions. The brightness is controlled through an Ultra
Fast PWM™ Control interface operating down to less than
1% duty cycle.
The MIC4801 is available in an 8-pin SOIC 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
• Dropout of 130mV at 400mA
• Programmable LED current with external resistor
• Current accuracy of ±1% typical
Applications
• Bill board displays
• Marquee displays
• Instrument displays
• Architectural lighting
____________________________________________________________________________________________________________
Typical Application
High Current Lighting Schematic
Micrel Inc. MIC4801
January 2011 2 M9999-011811-A
Ordering Information
Part Number Temperature Range Package
MIC4801YM –40°C to +125°C 8-Pin SOIC
Pin Configuration
8-Pin SOIC (M)
(Top View)
Pin Description
Pin Number Pin Name Pin Function
1 VIN Voltage Input. Connect at least 2.2µF ceramic capacitor between VIN and GND.
2 EN Enable LED drivers. This pin can be used as a PWM input for dimming of WLEDs. Do not leave
floating.
3 RSET An internal 1.27V reference sets the nominal maximum WLED current. Example, apply a 12.1kΩ
resistor between RSET and GND to set LED current to 416mA at 100% duty cycle.
4 GND Ground.
5 D1 LED1 driver input. Connect LED anode to VIN and cathode to this pin. All D1 pins must be
connected to the LED.
6 D1 LED1 driver input. Connect LED anode to VIN and cathode to this pin. All D1 pins must be
connected to the LED.
7 D1 LED1 driver input. Connect LED anode to VIN and cathode to this pin. All D1 pins must be
connected to the LED.
8 D1 LED1 driver input. Connect LED anode to VIN and cathode to this pin. All D1 pins must be
connected to the LED.

Produkt Specifikationer

Mærke: Microchip
Kategori: Ikke kategoriseret
Model: MIC4801

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