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AL8807

HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER



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AL8807 pdf
AL8807
HIGH EFFICIENCY LOW 36V 1A BUCK LED DRIVER
Description
The AL8807 is a step-down DC/DC converter designed to drive LEDs
with a constant current. The device can drive up to 9 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 AL8807 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 AL8807 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.
Features
LED Driving Current up to 1.3A (MSOP-8EP)
Better Than 5% Accuracy
High Efficiency up to 96%
Optimally Controlled Switching Speeds
Operating Input Voltage from 6V to 36V
PWM/DC Input for Dimming Control
Built-In Output Open-Circuit Protection
SOT25, MSOP-8EP: Available in “Green” Molding Compound
(No Br, Sb)
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
(Top View)
SW VIN
GND
CTRL
SOT25
(Top View)
SET
SET
GND
GND
CTRL
VIN
N/C
SW
SW
MSOP-8EP
Applications
MR16 Lamps
General Illumination Lamps
12V Powered LED Lamps
24V Powered 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/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
 
D3
DFLS 2100
P1
P2
D4
DFLS 2100 D2
C5 100nF
D5
C2
150µF
DFLS 2100 DFLS 2100
C3
150 µF
D1
DFLS 2100
R1
0 R15
U1
C1
CTRL
SW
100 nF
GND
AL8807
L1
33µH
ANODE
C4
1µF
CATHODE
GND
AL8807
Document number: DS35281 Rev. 5 - 2
1 of 20
www.diodes.com
March 2013
© Diodes Incorporated



No Preview Available !

AL8807 pdf
AL8807
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
Dimming and On/Off Control Input.
Leave floating for normal operation.
(VCTRL = VREF = 2.5V giving nominal average output current IOUTnom = 0.1/RS)
3 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.
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.
EP
Exposed pad/TAB connect to GND and thermal mass for enhanced thermal impedance. Should not be
used as electrical ground conduction path.
— 7 No Connection
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
SOT25
MSOP-8EP
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
1.25
1.6
2.5
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
fSW
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
Maximum Switching Frequency
Continuous Switch Current
SOT25
MSOP-8EP
Junction Temperature Range
Min
6.0
2.6
0.5
0
-40
Max
36
5.5
2.5
0.4
1
1
1.3
+125
Unit
V
V
V
V
MHz
A
°C
AL8807
Document number: DS35281 Rev. 5 - 2
2 of 20
www.diodes.com
March 2013
© Diodes Incorporated



Part Number AL8807
Description HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER
Maker Diodes Incorporated - Diodes Incorporated
Total Page 20 Pages
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