AL5802 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.
Pin Assignments
(Top View)
6
5
4
Q1
Q2
1
2
3
SOT26
Features
• Reference voltage V_RSET = 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
• SOT26: Available in “Green” Molding Compound (No Br, Sb)
• Qualified to AEC-Q101 Standards for High Reliability
Applications
• Linear LED driver
• LED signs
• Offline LED luminaries
Typical Application Circuit
AL5802
Document number: DS35516 Rev.4 - 2
1 of 11
www.diodes.com
November 2011
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