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AL5802 Datasheet

ADJUSTABLE CURRENT SINK LINEAR LED DRIVER

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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
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)
654
Q1
Q2
123
SOT26
Features
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
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
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/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


Diodes Semiconductor Electronic Components Datasheet

AL5802 Datasheet

ADJUSTABLE CURRENT SINK LINEAR LED DRIVER

No Preview Available !

AL5802
Pin Descriptions
Pin Number
1
2
3
4
5
6
Name
OUT
BIAS
EN
GND
FB
REXT
Function
Open-collector LED driver output
Biases the open collector output transistor
Enable pin for PWM dimming. Provides access to the base of Q2 and collector of Q1
Ground reference point for setting LED current
Feedback pin.
Should be connected to pin 6.
Current sense pin. LED current sensing resistor should be connected from here to GND.
Functional Block Diagram
Fig. 1 Block Diagram
Absolute Maximum Ratings
Symbol
VOUT
VBIAS
VFB
VEN
VREXT
IOUT
TJ
TST
Characteristics
Output voltage relative to GND
BIAS voltage relative to GND (Note 4)
LED voltage relative to GND
EN voltage relative to GND
REXT voltage relative to GND
Output current
Operating junction temperature
Storage temperature
These are stress ratings only. Operation outside the absolute maximum ratings may cause device failure.
Operation at the absolute maximum rating for extended periods may reduce device reliability.
Note: 4. With pins 5 and 6 connected together.
Values
30
30
6
6
6
150
-40 to +150
-55 to +150
Unit
V
V
V
V
V
mA
°C
°C
AL5802
Document number: DS35516 Rev. 9 - 2
2 of 11
www.diodes.com
March 2014
© Diodes Incorporated


Part Number AL5802
Description ADJUSTABLE CURRENT SINK LINEAR LED DRIVER
Maker Diodes
Total Page 11 Pages
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