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AL5801

ADJUSTABLE CURRENT SINK LINEAR LED DRIVER


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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 REXT
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.
Pin Assignments
(Top View)
REXT
SOT26
Features
Applications
Feedback pin reference voltage VRSET = 0.56V at +25ºC
Linear LED drivers
-40 to +125ºC temperature range
LED signs
1.1V to 100V open-drain output
Offline LED luminaries
Negative temperature VRSET co-efficient automatically reduces
the LED current at high temperatures
Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
www.DataSheet.net/
Halogen and Antimony Free. “Green” Device (Note 3)
Low thermal impedance SOT26 package with copper lead
frame
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 Application Circuit
AL5801
Document number: DS35555 Rev. 2 - 2
1 of 12
www.diodes.com
June 2012
© Diodes Incorporated
Datasheet pdf - http://www.DataSheet4U.co.kr/



No Preview Available !

AL5801 pdf
AL5801
100V, ADJUSTABLE CURRENT SINK LINEAR LED DRIVER
Pin Description
Pin
Number
1
2
3
4
5
6
Name
BIAS
FB
OUT
REXT
COMP
GND
Function
Biases the open-Drain output MOSFET
Feedback pin
Open-Drain LED driver output
Current sense pin. LED current sensing resistor should be connected from here to GND
Compensation pin. Connect COMP pin to REXT pin and insert a 1nF ceramic capacitor from COMP
pin to FB pin for improved transient stability
Ground reference point for setting the LED current
Functional Block Diagram
www.DataSheet.net/
Figure 1 Block Diagram
Absolute Maximum Ratings
Symbol
Characteristics
Values
VOUT
Output voltage relative to GND
100
VBIAS
BIAS voltage relative to GND (Note 4)
20
VFB FB voltage relative to GND
6
VCOMP
COMP voltage relative to GND
6
VREXT
REXT voltage relative to GND
6
IOUT
Output current
350
TJ Operating junction temperature
-40 to +150
TST Storage temperature
-55 to +150
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.
Notes: 4. With pins 5 and 6 connected together
Unit
V
V
V
V
V
mA
°C
°C
AL5801
Document number: DS35555 Rev. 2 - 2
2 of 12
www.diodes.com
June 2012
© Diodes Incorporated
Datasheet pdf - http://www.DataSheet4U.co.kr/



Part Number AL5801
Description ADJUSTABLE CURRENT SINK LINEAR LED DRIVER
Maker Diodes - Diodes
Total Page 12 Pages
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