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AL8807A

HIGH EFFICIENCY LOW EMI WIDE ANALOG DIMMING RANGE 36V 1A/1.3A BUCK LED DRIVER



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AL8807A pdf
Description
The AL8807A is a step-down DC/DC converter designed to drive
LEDs with a constant current. The device can drive up to 9 white high
brightness LEDs in series from a voltage source of 6V to 36V.
The AL8807A has an extended CTRL pin voltage range; increasing
its analog dimming range to greater than 10:1. The improved analog
dimming range makes it suitable for a variety of lighting applications
requiring wide analog dimming ranges.
The AL8807A switches at frequency up to 1MHz with controlled rise
and fall times to reduce EMI. This allows the use of small size
external components, hence minimizing the PCB area needed.
Maximum output current of AL8807A is set via an external resistor
connected between the VIN and SET input pins.
Over Temperature Protection is incorporated so that should a fault
occur the device will automatically shut-down and only restart when
its junction temperature has cooled down,
Features
LED Driving Current up to 1A/1.3A
Better than 5% Accuracy
High Efficiency Up to 96%
Optimally Controlled Switching Speeds
Operating Input Voltage from 6V to 36V
Wide Analog Input Range for Dimming Control (>10:1)
Built-in Protection Features:
Open-Circuit LED protection
LED Chain Short Circuited
Over-Temperature Protection
MSOP-8EP and SOT25: 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)
AL8807A
HIGH EFFICIENCY LOW EMI WIDE ANALOG
DIMMING RANGE 36V 1A/1.3A BUCK LED DRIVER
Pin Assignments
(Top View)
SOT25
(Top View)
SET 1
GND 2
GND 3
CTRL 4
8 VIN
7 N/C
6 SW
5 SW
MSOP-8EP
Applications
General Illumination Lamps
12V Powered LED Lamps
Wide Analog Dimming Range LED 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
AL8807A
Document number: DS35990 Rev. 2 - 2
1 of 20
www.diodes.com
March 2013
© Diodes Incorporated



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AL8807A pdf
AL8807A
Pin Descriptions
Pin Name
SW
GND
CTRL
SET
VIN
EP
N/C
Pin Number
SOT25 MSOP-8EP
Function
1 5, 6 Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI.
2 2, 3 GND Pin
LED current Analog Dimming Control Input. – No PWM dimming function.
Connected to internal 2.5V VREF via 50kresistor. So if left open circuit VCTRL = VREF = 2.5V and 100%
LED current is achieved - giving nominal average output current IOUTnom = 0.1/RS
3 4 For Analog dimming drive with analog voltage < 2.5V
(0.25V < VCTRL< 2.5V adjusts output current from 10% to 100% of IOUTnom. Device will dim the LED current
lower than this level but at reduced accuracy. Some devices will not totally turn off the LED current.
Soft-start can be implemented by connecting a capacitor to CTRL pin. The amount of soft-start is
dependent on ramp-up of input supply voltage and capacitor on CTRL pin. See apps section.
4 1 Set Nominal Output Current Pin. Configure the output current of the device.
5
8
Input Supply Pin. Must be locally decoupled to GND with > 2.2µF X7R ceramic capacitor – see
applications section for more information.
Exposed pad/TAB.
— EP It should be connected to GND and thermal mass for enhanced thermal impedance.
It should not be used as electrical ground conduction path.
— 7 No connection – may be connected to GND.
Functional Block Diagram
AL8807A
Document number: DS35990 Rev. 2 - 2
2 of 20
www.diodes.com
March 2013
© Diodes Incorporated



Part Number AL8807A
Description HIGH EFFICIENCY LOW EMI WIDE ANALOG DIMMING RANGE 36V 1A/1.3A BUCK LED DRIVER
Maker Diodes - Diodes
Total Page 20 Pages
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