http://www.www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf



Diodes Semiconductor Electronic Components Datasheet

AL8805 Datasheet

HIGH EFFICIENCY 30V 1A BUCK LED DRIVER

No Preview Available !

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



Diodes Semiconductor Electronic Components Datasheet

AL8805 Datasheet

HIGH EFFICIENCY 30V 1A BUCK LED DRIVER

No Preview Available !

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



Diodes Semiconductor Electronic Components Datasheet

AL8805 Datasheet

HIGH EFFICIENCY 30V 1A BUCK LED DRIVER

No Preview Available !

AL8805 pdf
AL8805
Electrical Characteristics (VIN = 12, @TA = +25°C, unless otherwise specified.)
Symbol
Parameter
Conditions
Min Typ Max Unit
VINSU
Internal Regulator Start Up Threshold VIN rising
5.9 V
VINSH
Internal Regulator Hysteresis Threshold VIN falling
100 300 mV
IQ Quiescent Current
IS Input Supply Current
VTH Set Current Threshold Voltage
Output not switching (Note 4)
CTRL pin floating f = 250kHz
350 µA
1.8 5 mA
95 100 105 mV
VTH-H
Set Threshold Hysteresis
±20 mV
ISET
RCTRL
VREF
RDS(on)
ISW_Leakage
SET Pin Input Current
CTRL Pin Input Resistance
Internal Reference Voltage
On Resistance of SW MOSFET
Switch Leakage Current
VSET = VIN-0.1
Referred to internal reference
ISW = 1A
VIN = 30V
16 22
50
2.5
0.25 0.4
0.5
µA
k
V
μA
fOSC Switching Frequency
Thermal Resistance Junction-to-
θJA Ambient (Note 5)
SOT25 (Note 6)
Thermal Resistance Junction-to-Lead
ΨJB (Note 7)
SOT25
1 MHz
250
°C/W
50
Notes:
4. AL8805 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. Refer to figure 34 for the device derating curve.
6. Test condition for SOT25: Device mounted on FR-4 PCB (25mm x 25mm 1oz copper, minimum recommended pad layout on top layer and thermal
vias to bottom layer ground plane. For better thermal performance, larger copper pad for heat-sink is needed.
7. As SOT25 doesn’t have an exposed tab or exposed pad the majority of heat flow is though pin 2 down to ground.
AL8805
Document number: DS35030 Rev. 4 - 2
3 of 16
www.diodes.com
July 2012
© Diodes Incorporated




Part Number AL8805
Description HIGH EFFICIENCY 30V 1A BUCK LED DRIVER
Maker Diodes Incorporated
Total Page 16 Pages
PDF Download
AL8805 pdf
Download PDF File
AL8805 pdf
View for Mobile






Related Datasheet

1 AL8805 HIGH EFFICIENCY 30V 1A BUCK LED DRIVER Diodes Incorporated
Diodes Incorporated
AL8805 pdf
2 AL8806 HIGH EFFICIENCY 30V 1.5A BUCK LED DRIVER Diodes Incorporated
Diodes Incorporated
AL8806 pdf
3 AL8806Q AUTOMOTIVE GRADE BUCK LED DRIVER Diodes
Diodes
AL8806Q pdf
4 AL8807 HIGH EFFICIENCY LOW EMI 36V 1A BUCK LED DRIVER Diodes Incorporated
Diodes Incorporated
AL8807 pdf
5 AL8807A HIGH EFFICIENCY LOW EMI WIDE ANALOG DIMMING RANGE 36V 1A/1.3A BUCK LED DRIVER Diodes
Diodes
AL8807A pdf
6 AL8807B HIGH EFFICIENCY 36V 1.3A PWM DIMMABLE BUCK LED DRIVER Diodes
Diodes
AL8807B pdf
7 AL8807BQ AUTOMOTIVE GRADE 30V 1.3A PWM DIMMABLE BUCK LED DRIVER Diodes
Diodes
AL8807BQ pdf
8 AL8807Q HIGH EFFICIENCY LOW 30V 1.3A AUTOMOTIVE GRADE BUCK LED DRIVER Diodes
Diodes
AL8807Q pdf
9 AL8808 COST EFFECTIVE LOW EMI 30V 1A BUCK LED DRIVER Diodes
Diodes
AL8808 pdf




Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

site map

webmaste! click here

contact us

Buy Components