AL8805EV2

Issue 1 – August 2010

www.diodes.com

© Diodes Incorporated 2010

2

AL8805 DEVICE DESCRIPTION

The AL8805 is a continuous mode inductive driver in a SOT25 package, for driving one or more

series-connected LEDs efficiently from a voltage source higher than the LED voltage. The device

includes the output switch and a current sense circuit, which requires an external sense resistor to set

the nominal current up to 1000mA.

AL8805 DEVICE FEATURES

•

Drives one or more series-connected LEDs

•

LEDs up to 1000mA.

•

Internal 30V switch.

•

Wide input voltage: 6V to 30V.

•

Inherent open circuit LED protection.

•

Brightness control using DC or PWM.

DEVICE APPLICATIONS

•

Low-voltage halogen replacement LEDs

•

High Power LED driving.

•

Illuminated signs.

AL8805 Device Packages, Pin and Definitions

SOT25 pack

AL8805 Device Pin Definition

Name

Pin No

Description

SW

1

Drain of NDMOS switch.

GND

2

Ground (0V).

CTRL

3

Internal voltage ref. pin (2.5V) :

•

Leave floating for normal operation.

•

Connect to GND to turn off output current.

•

Drive with DC voltage (0.4V to 2.5V) or with PWM signal to

Adjust output current

SET

4

Connect a sense resistor, Rs, from the SET pin to VIN to sense the

VIN

5

Input voltage: 6V to 30V. Decouple to ground with a 4.7uF or higher

ceramic capacitor.

ORDERING INFORMATION

EVALBOARD ORDER

NUMBER

AL8805EV2

Please note: Evaluation boards are subject to

availability and qualified sales leads.

DEVICE ORDER NUMBER

AL8805E5TA