Diodes AL8807Q User Manual download pdf

AL8807Q

Document number: DS36904 Rev. 1 - 2

1 of 16

www.diodes.com

March 2014

L8807Q

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

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

CTRL

N/C

1 2 3 4 5 6 ... 15 16

Summary of Contents

Page 1 - HIGH EFFICIENCY LOW 30V 1.3A

AL8807Q Document number: DS36904 Rev. 1 - 2 1 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807QHIGH EFFICIENCY LOW 30V 1.3A AUTOMOTIVE G

Page 2

AL8807Q Document number: DS36904 Rev. 1 - 2 10 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Application Information (cont.) PWM Di

Page 3

AL8807Q Document number: DS36904 Rev. 1 - 2 11 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Application Information (cont.) Soft S

Page 4 - V = V= 12V

AL8807Q Document number: DS36904 Rev. 1 - 2 12 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Application Information (cont.) Diode

Page 5

AL8807Q Document number: DS36904 Rev. 1 - 2 13 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Application Information (cont.) Induct

Page 6

AL8807Q Document number: DS36904 Rev. 1 - 2 14 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Application Information (cont.) EMI an

Page 7 - A LED Current (cont.) (@T

AL8807Q Document number: DS36904 Rev. 1 - 2 15 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Ordering Information Part Number Pa

Page 8

AL8807Q Document number: DS36904 Rev. 1 - 2 16 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Suggested Pad Layout Please see AP0200

Page 9

AL8807Q Document number: DS36904 Rev. 1 - 2 2 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Pin Descriptions Pin Name Pin Number

Page 10 - Application Information

AL8807Q Document number: DS36904 Rev. 1 - 2 3 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Recommended Operating Conditions (@TA =

Page 11 - Capacitor Selection

AL8807Q Document number: DS36904 Rev. 1 - 2 4 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Typical Performance Characteristics (@T

Page 12

AL8807Q Document number: DS36904 Rev. 1 - 2 5 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Typical Performance Characteristics (co

Page 13 - Thermal Considerations

AL8807Q Document number: DS36904 Rev. 1 - 2 6 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Typical Performance Characteristics 670

Page 14

AL8807Q Document number: DS36904 Rev. 1 - 2 7 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Typical Performance Characteristics 1A

AL8807Q Document number: DS36904 Rev. 1 - 2 8 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Typical Performance Characteristics 1.3

Page 16

AL8807Q Document number: DS36904 Rev. 1 - 2 9 of 16 www.diodes.com March 2014© Diodes Incorporated AL8807Q Application Information The AL8807Q is

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Diodes AL8807Q User Manual

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