AL8807BQ LED DRIVER Datasheet

AL8807BQ Datasheet, PDF, Equivalent


Part Number

AL8807BQ

Description

AUTOMOTIVE GRADE 30V 1.3A PWM DIMMABLE BUCK LED DRIVER

Manufacture

Diodes

Total Page 18 Pages
Datasheet
Download AL8807BQ Datasheet


AL8807BQ
AL8807BQ
AUTOMOTIVE GRADE 30V 1.3A PWM DIMMABLE BUCK LED DRIVER
Description
The AL8807BQ 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 30V. Series connection of the LEDs provides
identical LED currents resulting in uniform brightness and eliminating
the need for ballast resistors. The AL8807BQ 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 AL8807BQ 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
Applications
Automotive Lamps
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 30V
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)
Automotive Grade
Qualified to AEC-Q100 Standards for High Reliability
PPAP Capable (Note 4)
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.
4. Automotive products are AEC-Q100 qualified and are PPAP capable. Automotive, AEC-Q100 and standard products are electrically and thermally the
same, except where specified. For more information, please refer to http://www.diodes.com/quality/product_compliance_definitions/.
Typical Application Circuit
AL8807BQ
Document number: DS37011 Rev. 1 - 2
1 of 18
www.diodes.com
October 2014
© Diodes Incorporated

AL8807BQ
AL8807BQ
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
AL8807BQ
Document number: DS37011 Rev. 1 - 2
2 of 18
www.diodes.com
October 2014
© Diodes Incorporated


Features NEW PRODUCT AL8807BQ AUTOMOTIVE GRADE 3 0V 1.3A PWM DIMMABLE BUCK LED DRIVER D escription The AL8807BQ 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 f orward voltage of the LEDs, in series f rom a voltage source of 6V to 30V. Seri es connection of the LEDs provides iden tical LED currents resulting in uniform brightness and eliminating the need fo r ballast resistors. The AL8807BQ switc hes at frequency up to 1MHz with contro lled rise and fall times to reduce EMI. This allows the use of small size exte rnal components, hence minimizing the P CB area needed. Maximum output current of AL8807BQ is set via an external resi stor connected between the VIN and SET input pins. Dimming is achieved by appl ying a PWM signal at the CTRL input pin . An input voltage of 0.4V or lower at CTRL switches off the output MOSFET sim plifying PWM dimming. Pin Assignments SET GND GND CTRL (Top View) MSOP-8EP Applications  Automoti.
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