AL5801 Datasheet, PDF (1/11 Pages) Diodes Incorporated – 100V, ADJUSTABLE CURRENT SINK LINEAR LED DRIVER

AL5801
100V, ADJUSTABLE CURRENT SINK LINEAR LED DRIVER
Description
The AL5801 combines a 100V N-channel MOSFET with a pre-
biased NPN transistor to make a simple, small footprint LED driver.
The LED current is set by an external resistor connected from R_EXT
pin (4) to GND pin (6). The internal pre-biased transistor develops
approximately 0.56V across the external resistor.
The AL5801 open-drain output can operate from 1.1V to 100V
enabling it to operate 5V to 100V power supplies without additional
components.
PWM dimming of the LED current can be achieved by driving the
BIAS pin (1) with an external, open-collector NPN transistor or
open-drain N-channel MOSFET.
The AL5801 is available in a SOT26 package and is ideal for driving
LED currents up to 350mA.
Features
• Feedback Pin Reference Voltage V_RSET = 0.56V at +25°C
• -40°C to +125°C Temperature Range
• 1.1V to 100V Open-Drain Output
• Negative temperature V_RSET co-efficient automatically reduces
the LED current at high temperatures
• Low thermal impedance SOT26 package with copper lead
frame
• Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
• Halogen and Antimony Free. “Green” Device (Note 3)
• Qualified to AEC-Q101 Standards for High Reliability
Pin Assignments
(Top View)
SOT26
Applications
• Linear LED Drivers
• LED Signs
• Offline LED Luminaries
Notes:
1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
2. See http://www.diodes.com for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
Typical Applications Circuit
AL5801
Document number: DS35555 Rev. 3 - 2
1 of 11
www.diodes.com
July 2012
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