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Diodes Semiconductor Electronic Components Datasheet

AL8807B Datasheet

HIGH EFFICIENCY 36V 1.3A PWM DIMMABLE BUCK LED DRIVER

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AL8807B pdf
AL8807B
HIGH EFFICIENCY 36V 1.3A PWM DIMMABLE BUCK LED DRIVER
Description
The AL8807B 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 AL8807B 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 AL8807B is set via an external resistor
connected between the VIN and SET input pins. Dimming is
achieved by applying 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
SET
GND
GND
CTRL
(Top View)
MSOP-8EP
VIN
N/C
SW
SW
Features
LED driving current up to 1.3A
Better than 5% accuracy
High efficiency up to 96%
Optimally controlled switching speeds
Operating input voltage from 6V to 36V
PWM input for dimming control
Open-Circuit LED protection
LED Chain Short Circuited
Over-Temperature Protection
MSOP-8EP 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)
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 Application Circuit
D1 R1
VIN:
6 ~ 36V
C1 AL8807B
PWM Dimming
Input:
C2
L1
AL88070B
Document number: DS36191 Rev. 1 - 2
1 of 18
www.diodes.com
March 2014
© Diodes Incorporated
Free Datasheet http://www.0PDF.com



Diodes Semiconductor Electronic Components Datasheet

AL8807B Datasheet

HIGH EFFICIENCY 36V 1.3A PWM DIMMABLE BUCK LED DRIVER

No Preview Available !

AL8807B pdf
AL8807B
Pin Descriptions
Pin Name
SET
GND
CTRL
SW
N/C
VIN
EP
Pin
Number
1
2, 3
4
5, 6
7
8
EP
Function
Set Nominal Output Current Pin. Configure the output current of the device.
GND Pins
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
A PWM signal (2.5V) allows the output current to be adjusted below the level set by the resistor
connected to SET input pin.
Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to reduce EMI.
no connection
Input Supply Pin. Must be locally decoupled to GND with > 2.2µF X7R ceramic capacitor – see
applications section for more information.
Exposed pad/TAB connects to GND and thermal mass for enhanced thermal impedance. Should not be
used as electrical ground conduction path.
Functional Block Diagram
AL88070B
Document number: DS36191 Rev. 1 - 2
2 of 18
www.diodes.com
March 2014
© Diodes Incorporated
F
r
e



Diodes Semiconductor Electronic Components Datasheet

AL8807B Datasheet

HIGH EFFICIENCY 36V 1.3A PWM DIMMABLE BUCK LED DRIVER

No Preview Available !

AL8807B pdf
AL8807B
Absolute Maximum Ratings
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
Peak Switch Current (<10%)
Junction Temperature
Lead Temperature Soldering
Storage Temperature Range
MSOP-8EP
Ratings
2.5
200
-0.3 to +40
-0.3 to +40
-0.3 to +6
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
Symbol
VIN
VCTRLH
VCTRLL
fSW
ISW
TJ
Parameter
Operating Input Voltage Relative to GND
Voltage High for PWM Dimming Relative to GND
Voltage Low for PWM Dimming Relative to GND
Maximum Switching Frequency
Continuous Switch Current
Junction Temperature Range
MSOP-8EP
Min Max
6.0 36
2.5 5.5
0 0.4
1
1.3
-40 +125
Unit
V
V
V
MHz
A
°C
Electrical Characteristics (VIN = 12V, @TA = +25°C, unless otherwise specified.)
Symbol
VINSU
VINSH
IQ
IS
VTH
VTH-H
ISET
RCTRL
VREF
RDS(ON)
tR
tF
TOTP
TOTP-Hyst
ISW_Leakage
θJA
θJC
Parameter
Conditions
Internal Regulator Start Up Threshold VIN rising
Internal Regulator Hysteresis Threshold VIN falling
Quiescent Current
Output not switching (Note 4)
Input Supply Current
CTRL pin floating f = 250kHz
Set Current Threshold Voltage
Set Threshold Hysteresis
SET Pin Input Current
CTRL Pin Input Resistance
VSET = VIN-0.1
Referred to internal reference
Internal Reference Voltage
On Resistance of SW MOSFET
SW Rise Time
SW Fall Time
Over-Temperature Shutdown
Over-Temperature Hysteresis
Switch Leakage Current
Thermal Resistance Junction-to-
Ambient (Note 5)
Thermal Resistance Junction-to-case
(Note 7)
ISW = 1A
VSENSE = 100 ±20mV fSW = 250kHz
VSW = 0.1V~12V~0.1V CL = 15pF
VIN =36V
(Note 6)
(Note 6)
Min
100
95
Typ
1.8
100
±15
16
50
2.5
0.25
12
20
155
55
69
4.3
Max Unit
5.9 V
300 mV
350 µA
5 mA
105 mV
— mV
22 µA
— k
—V
0.4
— ns
— ns
— °C
— °C
0.5 μA
— °C/W
——
Notes:
4. AL8807B 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 39 for the device derating curve.
6. Test condition for MSOP-8EP: Device mounted on FR-4 PCB (51mm x 51mm 2oz copper, minimum recommended pad layout on top layer and
thermal vias to bottom layer with maximum area ground plane. For better thermal performance, larger copper pad for heat-sink is needed.
7. Dominant conduction path is via exposed pad.
AL88070B
Document number: DS36191 Rev. 1 - 2
3 of 18
www.diodes.com
March 2014
© Diodes Incorporated
Free Datasheet http://www.0PDF.com




Part Number AL8807B
Description HIGH EFFICIENCY 36V 1.3A PWM DIMMABLE BUCK LED DRIVER
Maker Diodes
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