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AL5802
30V, ADJUSTABLE CURRENT SINK LINEAR LED DRIVER
Description
The AL5802 combines a high gain NPN transistor 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 REXT
pin (6) to GND pin (4), the internal high gain transistor develops
Pin Assignments
(Top View)
approximately 0.6V across the external resistor.
6
5
4
The AL5802 open-collector output can operate from 0.8V to 30V
enabling it to operate from 5V to 24V power supplies without
additional components.
PWM dimming of the LED current can be achieved by either driving
the BIAS pin (2) with a low impedance voltage source, or driving the
Q2
Q1
EN pin (3) with an external open-collector NPN transistor or open-
1
2
3
drain N-channel MOSFET.
The AL5802 is available in a SOT26 package and is ideal for driving
20mA to 120mA LED currents.
Features
Applications
SOT26
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Reference voltage VRSET = 0.65V
-40 to +125°C temperature range
0.8V to 30V open-collector output
Negative temperature co-efficient – automatically reduces the
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Linear LED driver
LED signs
Offline LED luminaries
LED current at high temperatures
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Low thermal impedance SOT26 with copper leadframe
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Qualified to AEC-Q101 Standards for High Reliability
Typical Application Circuit
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html 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.
AL5802
Document number: DS35516 Rev. 9 - 2
1 of 11
www.diodes.com
March 2014
? Diodes Incorporated
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