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AL5811 Datasheet

LINEAR 75mA ADJUSTABLE CURRENT LED DRIVER

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AL5811 pdf
AL5811
60V, LINEAR 75mA ADJUSTABLE CURRENT LED DRIVER
Description
The AL5811 is a Linear LED driver with an adjustable LED current up
to 75mA offering excellent temperature stability and output handling
capability. The AL5811 simplifies the design of linear and isolated or
non-isolated LED drivers by setting the LED current with standard
value resistors.
The AL5811 has an open drain output that can swing from 1V up to
60V enabling it drive long LED chains. Its low 0.5V RSET pin is
outside of the LED current path and so accuracy is maintained while
minimizing the required overhead to regulate the LED current. This
reduces its power dissipation when compared to traditional linear
LED drivers. This makes it ideal for driving LEDs up to 75mA.
Longer LED chains can be driven by tapping VCC from the chain,
where the chain voltage may exceed 60V.
The AL5811 is available in the exposed pad MSOP-8EP and
U-DFN3030-6 packages.
Pin Assignments
VCC 1
NC 2
NC 3
RSET 4
(Top View)
MSOP-8EP
(Top View)
8 LED
7 NC
6 NC
5 GND
VCC 1
NC 2
RSET 3
Exposed
Pad
6 LED
5 NC
4 GND
U-DFN3030-6
Features
Low Reference Voltage (VRSET = 0.5V)
-40°C to +125°C Temperature Range
±6% Typical LED Current Tolerance
Low Temperature Drift
1.0V to 60V Open-Drain Output
High Power Supply Rejection
MSOP-8EP and U-DFN3030-6
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
Isolated Offline LED Converters
Linear LED Driver
LED Signs
Instrumentation Illumination
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.
Typical Applications Circuit
AL5811
Document number: DS35255 Rev. 2 - 2
1 of 13
www.diodes.com
March 2014
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL5811 Datasheet

LINEAR 75mA ADJUSTABLE CURRENT LED DRIVER

No Preview Available !

AL5811 pdf
AL5811
Pin Descriptions
Pin
Name
VCC
RSET
GND
LED
NC
EP
Pin Number
MSOP-8EP U-DFN3030-6
11
43
5
8
2, 3, 6, 7
4
6
2, 5
Exposed Pad Exposed Pad
Function
Supply Input.
Connect a 0.1μF ceramic capacitor between VCC and GND as close as possible to the device.
LED Current Setting Pin.
Connect a resistor from this pin to GND:
ILED = 750/RSET
May also be used to provide PWM dimming functionality
Ground Reference Point of Device.
LED Current Sink Connection.
Unused
Exposed Pad (bottom).
Used to improve thermal impedance of package.
It must be connected to GND directly underneath the package.
Functional Block Diagram
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol
VCC
VLED
VRSET
ILED
ESD HBM
ESD CDM
TJ
TST
Parameters
Supply Voltage Relative to GND Pin (Note 4)
LED Voltage Relative to GND Pin (Note 4)
RSET Voltage Relative to GND Pin
LED Pin Current Sink Current Range
Human Body Model ESD Protection
Charged Device Model ESD protection
Operating Junction Temperature
Storage Temperature
Ratings
-0.3 to +66
-0.3 to +66
-0.3 to +6
85
1
1.2
-40 to +150
-55 to +150
Unit
V
V
V
mA
kV
kV
°C
°C
Notes:
Caution:
4. VCC pin can be greater or smaller than VLED; neither should go below GND.
Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only;
functional operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be
affected by exposure to absolute maximum rating conditions for extended periods of time.
Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when
handling and transporting these devices
AL5811
Document number: DS35255 Rev. 2 - 2
2 of 13
www.diodes.com
March 2014
© Diodes Incorporated



Diodes Semiconductor Electronic Components Datasheet

AL5811 Datasheet

LINEAR 75mA ADJUSTABLE CURRENT LED DRIVER

No Preview Available !

AL5811 pdf
AL5811
Package Thermal Data
Package
MSOP-8EP
U-DFN3030-6
θJC
Thermal Resistance
Junction-to-case
(Note 5)
37
13
θJA
Thermal Resistance
Junction-to-Ambient
(Note 5)
85°C/W (Note 6)
71°C/W (Note 7)
PDIS
TA = +25°C,
TJ = +125°C
1.2W
1.40W
Notes:
5. Dominant conduction path via exposed pad.
6. Test condition for MSOP-8EP: Device mounted on FR-4 PCB (51mm x 51mm 2oz copper, minimum recommended pad layout on top layer and
thermal vias to bottom layer ground plane. For better thermal performance, larger copper pad for heat-sink is needed.
7. Test condition for U-DFN3030-6: Device mounted on FR-4 PCB (51mm x 51mm 2oz copper, minimum recommended pad layout on top layer and
thermal vias to bottom layer with maximum area ground plane. For better thermal performance, larger copper pad for heat-sink is needed
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Min Max Unit
VCC
VLED
ILED
TA
Supply Voltage Range Relative to GND Pin
OUT Voltage Range Relative to GND Pin
LED Pin Current (Note 8)
Operating Ambient Temperature Range
3.5 60
1.0 60
10 75
-40 +125
V
mA
°C
Note:
8. Maximum LED current is also limited by ambient temperature and power dissipation such that junction temperature should
be kept less than or equal +125°C.
Electrical Characteristics (@TA = +25°C, VCC = 3.5V, VLED = 1.0 (Note 9), RSET = 15k, unless otherwise specified.)
Symbol
Parameter
Conditions
VRSET
RSET Voltage
ILED ILED Current Accuracy
REGLINE
ICC
LED Current Line Regulation
Supply Current
ILEAK
LED Pin Leakage Current
RSET = 37.5k
RSET = 10k
RSET = 15k
VCC = 3.5V to 60V
3.5V VCC 60V
VCC = 60V; VLED = 60V
RSET = Open Circuit
TA = -40°C to +125°C
TA = +25°C
TA = -40°C to +125°C
TA = +25°C
TA = +25°C
TA = -40°C to +125°C
TA = +125°C
TSHDN
THYS
Thermal Shutdown
Thermal Shutdown Hysteresis
Note:
9. All voltages unless otherwise stated are measured with respect to GND pin.
Min Typ Max
— 0.5 —
18 20 22
70 75 80
47 50 53
46 — 54
— 0.25 —
— 200 300
— — 350
——
1
— +155 —
— +20 —
Unit
V
mA
%
µA
µA
°C
°C
AL5811
Document number: DS35255 Rev. 2 - 2
3 of 13
www.diodes.com
March 2014
© Diodes Incorporated




Part Number AL5811
Description LINEAR 75mA ADJUSTABLE CURRENT LED DRIVER
Maker Diodes
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