Diodes AL8807Q - Manual

AL8807Q
Document number: DS36904 Rev. 1 - 2
1 of 16
www.diodes.com
March 2014
© Diodes Incorporated
AL8807Q
HIGH EFFICIENCY LOW 30V 1.3A
AUTOMOTIVE GRADE BUCK LED DRIVER
Description
The AL8807Q 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 AL8807Q 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 AL8807Q is set via an external resistor
connected between the V
IN
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.
The AL8807Q
has been qualified to AEC-Q100 Grade 1 and is
Automotive Grade supporting PPAPs
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/DC input for dimming control
 Built-in output open-circuit protection
 Automotive Grade with AEC-Q100 Qualification
 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)
 Automotive Grade
 Qualified to AEC-Q100 Standards for High Reliability
 PPAP Capable (Note 4)
Pin Assignments
Applications
 Automotive Interior LED Lamps
 Automotive Exterior 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.
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 Applications Circuit
(Top View)
MSOP-8EP
SET
GND
GND
CTRL
V
IN
N/C
SW
SW