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AL8805
Pin Descriptions
Pin Number
1
2
Pin Name
SW
GND
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.
(V CTRL = V REF = 2.5V giving nominal average output current I OUTnom = 0.1/R S )
3
CTRL
?
?
?
Drive to voltage below 0.4V to turn off output current
Drive with DC voltage (0.5V < V CTRL < 2.5V) to adjust output current from 20% to 100% of I OUTnom
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
5
SET
V IN
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 (@T A = +25°C, unless otherwise specified.)
Symbol
ESD HBM
ESD MM
V IN
V SET
V SW
V CTRL
I SW-DC
I SW-PK
T J
T LEAD
T ST
Parameter
Human Body Model ESD Protection
Machine Model ESD Protection
Continuous V IN Pin Voltage Relative to GND
SET Pin Voltage Relative to V IN Pin
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
-5 to +0.3
-0.3 to 40
-0.3 to 6
1.25
2.5
150
300
-65 to +150
Unit
kV
V
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 (@T A = +25°C, unless otherwise specified.)
Symbol
V IN
V CTRLH
V CTRLDC
V CTRLL
I SW
T J
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
6.0
2.6
0.5
0
—
-40
Max
36
5.5
2.5
0.4
1
125
Unit
V
V
V
V
A
°C
AL8805
Document number: DS35030 Rev. 4 - 2
2 of 16
www.diodes.com
July 2012
? Diodes Incorporated
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