Issue 3 – August 2010

www.diodes.com

© Diodes Incorporated, 2010

AL8805EV1 EVALUATION BOARD USER GUIDE

DESCRIPTION

The AL8805EV1, Figure 1, is a double sided evaluation board for the AL8805 LED driver with internal

switch. The evaluation board is preset to drive 680mA into a single LED, or multiple LEDs, the

maximum number of which depends on their total forward voltage drop. (The maximum drive current

of the AL8805 is 1000mA)

The operating voltage is nominally 30 volts, but it can be reduced to a minimum of 6 volts. The 68uH

inductor used in the circuit is based on this nominal supply. The nominal voltage must be connected

across the +Vin and GND pins.

Note: The evaluation board does not have reverse supply protection.

The nominal current, 680mA, is set with the 0R15 sense resistor, R1.

Terminal CTRL provides a connection point for DC or PWM dimming and shutdown.

Warning: At 30V nominal operation with 680mA output, the LED will be hot and very bright

Figure 1: AL8805EV1 evaluation board and connection diagram

AL8805EV1 Connection Point Definition

Name

Description

Vin

Positive supply voltage. 6 to 30V

GND

Supply Ground (0V).

CTRL

Internal voltage ref. pin (2.5V). This pin can be used to achieve dimming and for

switching the output current off.

Leave floating for normal operation.

LED A

LED A

connects to the external LED anode

LED K

LED K

connects to the external LED cathode

6-30VDC

1-8

LEDs

V