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AL8806 Datasheet

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



Diodes Semiconductor Electronic Components Datasheet

AL8806 Datasheet

HIGH EFFICIENCY 30V 1.5A BUCK LED DRIVER

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



Diodes Semiconductor Electronic Components Datasheet

AL8806 Datasheet

HIGH EFFICIENCY 30V 1.5A BUCK LED DRIVER

No Preview Available !

AL8806 pdf
AL8806
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol
ESD HBM
ESD MM
VIN
VSW
VCTRL
ISW-RMS
ISW-PK
TJ
TLEAD
TST
Parameter
Human Body Model ESD Protection
Machine Model ESD Protection
Continuous VIN pin voltage relative to GND
SW voltage relative to GND
CTRL pin input voltage
DC or RMS switch current
Peak switch current (<10%)
Junction Temperature
Lead Temperature Soldering
Storage Temperature Range
Ratings
2.5
200
-0.3 to +40
-0.3 to +40
-0.3 to +6
1.65
3
150
300
-65 to +150
Unit
kV
V
V
V
V
A
A
°C
°C
°C
Caution:
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.
Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol
VIN
VCTRLH
VCTRLDC
VCTRLL
ISW
fOSC
TJ
Parameter
Operating Input Voltage relative to GND
Voltage High for PWM dimming relative to GND
Voltage range for 20% to 100% DC dimming relative to GND
Voltage Low for PWM dimming relative to GND
DC or RMS switch current
Switching Frequency
Junction Temperature Range
Min
6.0
2.6
0.5
0
-40
Max
36
5.5
2.5
0.4
1.5
1
+125
Unit
V
V
V
V
A
MHz
°C
Electrical Characteristics (@VIN = 12V, TA = +25°C, unless otherwise specified.)
Symbol
VINSU
VINSH
IQ
IS
VTH
VTH-H
ISET
RCTRL
VREF
RDS(on)
ISW_Leakage
JA
JC
Parameter
Internal regulator start up threshold
Internal regulator hysteresis threshold
Quiescent current
Input supply Current
Set current Threshold Voltage
Set threshold hysteresis
SET pin input current
CTRL pin input resistance
Internal Reference Voltage
On Resistance of SW MOSFET
Switch leakage current
Thermal Resistance Junction-to-Ambient (Note 5)
Thermal Resistance Junction-to-Case (Note 5)
Conditions
VIN rising
VIN falling
Output not switching (Note 4)
CTRL pin floating f = 250kHz
VCTRL 2.6V or floating.
VSET = VIN-0.1
Referred to internal reference
ISW = 1A
VIN =36V
MSOP-8EP (Note 6)
MSOP-8EP (Note 6)
Min Typ Max Unit
5.9 V
100 300 mV
350 µA
1.8 5 mA
95 100 105 mV
±20 mV
16 22 µA
50 k
2.5 V
0.18 0.35
0.5 μA
69
C/W
4.3
Notes:
4. AL8806 does not have a low power standby mode but current consumption is reduced when output switch is inhibited: VSENSE = 0V. Parameter is
tested with VCTRL 2.5V
5. Dominant conduction path via exposed pad. Refer to figure 5 for the device derating curve.
6. Measured on an FR4 51x51mm PCB with 2oz copper standing in still air with minimum recommended pad layout on top layer and thermal vias to
bottom layer maximum area ground plane. For better thermal performance, larger copper pad for heat-sink is needed.
AL8806
Document number: DS35144 Rev. 5 - 2
3 of 15
www.diodes.com
July 2013
© Diodes Incorporated




Part Number AL8806
Description HIGH EFFICIENCY 30V 1.5A BUCK LED DRIVER
Maker Diodes Incorporated
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