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AL8805

HIGH EFFICIENCY 30V 1A BUCK LED DRIVER


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AL8805 pdf
AL8805
HIGH EFFICIENCY 36V 1A BUCK LED DRIVER
Description
The AL8805 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. Series connection of the LEDs provides
identical LED currents resulting in uniform brightness and eliminating
the need for ballast resistors. The AL8805 switches at frequency up to
1MHz. This allows the use of small size external components, hence
minimizing the PCB area needed.
Maximum output current of AL8805 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
(Top View)
SW 1
GND 2
CTRL 3
5 VIN
4 SET
SOT25
Features
• LED Driving Current up to 1A
• 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
• SOT25: Available in “Green” Molding Compound (No Br,Sb) with
lead Free Finish/ RoHS Compliant
ƒ Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
ƒ Halogen and Antimony Free. “Green” Device (Note 3)
Applications
• MR16 Lamps
• General Illumination Lamps
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
AL8805
Document number: DS35030 Rev. 4 - 2
1 of 16
www.diodes.com
July 2012
© Diodes Incorporated



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AL8805 pdf
AL8805
Pin Descriptions
Pin Number
1
2
3
4
5
Pin Name
SW
GND
CTRL
SET
VIN
Function
Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI.
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)
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.
Set Nominal Output Current Pin. Configure the output current of the device.
Input Supply Pin. Must be locally decoupled to GND with > 2.2µF X7R ceramic capacitor – see applications
section for more information.
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Ratings
Unit
ESD HBM Human Body Model ESD Protection
2.5 kV
ESD MM Machine Model ESD Protection
200 V
VIN
VSET
VSW
VCTRL
Continuous VIN Pin Voltage Relative to GND
SET Pin Voltage Relative to VIN Pin
SW Voltage Relative to GND
CTRL Pin Input Voltage
-0.3 to 40
-5 to +0.3
-0.3 to 40
-0.3 to 6
V
V
V
V
ISW-DC
DC or RMS Switch current
1.25 A
ISW-PK
TJ
TLEAD
Peak Switch Current (<10%)
Junction Temperature
Lead Temperature Soldering
2.5 A
150 °C
300 °C
TST Storage Temperature Range
-65 to +150
°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
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
Continuous Switch Current
Junction Temperature Range
Min Max Unit
6.0 36
V
2.6 5.5
V
0.5 2.5
V
0 0.4 V
—1 A
-40 125 °C
AL8805
Document number: DS35030 Rev. 4 - 2
2 of 16
www.diodes.com
July 2012
© Diodes Incorporated



Part Number AL8805
Description HIGH EFFICIENCY 30V 1A BUCK LED DRIVER
Maker Diodes Incorporated - Diodes Incorporated
Total Page 16 Pages
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