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AL8806

HIGH EFFICIENCY 30V 1.5A BUCK LED DRIVER



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AL8806 pdf
AL8806
HIGH EFFICIENCY 36V 1.5A BUCK LED DRIVER
Description
The AL8806 is a step-down DC/DC converter designed to drive LEDs
with a constant current. The device can drive up to 8 LEDs,
depending on the forward voltage of the LEDs, in series from a
voltage source of 6V to 36V. The AL8806 switches at frequencies up
to 1MHz. This allows the use of small size external components,
hence minimizing the PCB area needed.
Maximum output current of AL8806 is set via an external resistor
connected between the VIN and SET input pins. Dimming is achieved
by applying either a DC voltage or a PWM signal at the CTRL input
pin. An input voltage of 0.4V or lower at CTRL switches off the output
MOSFET simplifying PWM dimming.
Pin Assignments
SET 1
GND 2
GND 3
CTRL 4
8 VIN
AL8806 7 N/C
6 SW
5 SW
MSOP-8EP
Features
LED driving current up to 1.5A
Better than 5% accuracy
High efficiency up to 98%
Operating input voltage from 6V to 36V
High switching frequency up to 1MHz
PWM/DC input for dimming control
Built-in output open-circuit protection
MSOP-8EP: Available in “Green” Molding Compound (No Br,
Sb) with lead Free Finish/ RoHS Compliant
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
High Power MR16 Lamps
General Illumination Lamps
Multi-Die LED Driver
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.
Typical Applications Circuit
D2 D3
DFLS230LH
D1 RSET
0R089
~
12VAC
DFLS230LH
x4
C1
450µF
D4 D5
AL8806
C2
1µF
33µH L1
Multi-
die
LED
AL8806
Document number: DS35144 Rev. 5 - 2
1 of 15
www.diodes.com
July 2013
© Diodes Incorporated



No Preview Available !

AL8806 pdf
AL8806
Pin Descriptions
Pin
Name
SW
GND
CTRL
SET
VIN
EP
N/C
Pin Number
MSOP-8EP
Function
5, 6 Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI.
2, 3 GND Pin
Dimming and On/Off Control Input.
Leave floating for normal operation.
(VCTRL = VREF = 2.5V giving nominal average output current IOUTnom = 0.1/RS)
4 Drive to voltage below 0.4V to turn off output current
Drive with DC voltage (0.5V < VCTRL < 2.5V) to adjust output current from 20% to 100% of IOUTnom
A PWM signal (low level 0.4V and high level > 2.6; transition times less than 1us) allows the output current to be
adjusted below the level set by the resistor connected to SET input pin.
1 Set Nominal Output Current Pin. Configure the output current of the device.
8
Input Supply Pin. Must be locally decoupled to GND with > 2.2µF X7R ceramic capacitor – see applications section for
more information.
Exposed pad:
EP Connect to GND and thermal mass for enhanced thermal impedance. It should not be used as electrical ground
conduction path.
7 no connection
Functional Block Diagram
AL8806
Document number: DS35144 Rev. 5 - 2
2 of 15
www.diodes.com
July 2013
© Diodes Incorporated



Part Number AL8806
Description HIGH EFFICIENCY 30V 1.5A BUCK LED DRIVER
Maker Diodes Incorporated - Diodes Incorporated
Total Page 15 Pages
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