Issue 1 – October 2012

www.diodes.com

© Diodes Incorporated, 2012

AL8807AEV1 EVALUATION BOARD USER GUIDE

DESCRIPTION

The AL8807AEV1, Figure 1, is a double sided evaluation board for the AL8807A step-down, or ‘buck’,

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 and the

supply voltage. (The maximum drive current of the AL8807A is 1000mA)

The operating voltage of the board is nominally 36 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 evaluation board

should be connected as in Figure 1 below.

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 Analog dimming.

Warning: At 36V nominal operation with 680mA output, the LED will be hot and very bright

Figure 1: AL8807AEV1 evaluation board and connection diagram

AL8807AEV1 Connection Point Definition

Name

Description

Vin

Positive supply voltage. 6 to 36V

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

1-8

LEDs

6-36VDC

V

+