AL5802-7 Datasheet, PDF (1/11 Pages) Diodes Incorporated – 30V, ADJUSTABLE CURRENT SINK LINEAR LED DRIVER

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 to from
REXT pin (6) to GND pin (4), the internal high gain transistor
develops approximately 0.6V across the external resistor.
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
EN pin (3) with an external open-collector NPN transistor or open-
drain N-channel MOSFET.
The AL5802 is available in a SOT26 package and is ideal for driving
20mA to 120mA LED currents.
Features
• Reference voltage VRSET = 0.65V
• -40 to 125ºC temperature range
• 0.8V to 30V open-collector output
• Negative temperature co-efficient – automatically reduce the
LED current at high temperatures
• 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
Pin Assignments
(Top View)
6
5
4
Q1
Q2
1
2
3
SOT26
Applications
• Linear LED driver
• LED signs
• Offline LED luminaries
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 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. 6 - 2
1 of 11
www.diodes.com
December 2012
© Diodes Incorporated