Issue 2 – October 2012

www.diodes.com

© Diodes Incorporated, 2012

AL8807AEV3 EVALUATION BOARD USER GUIDE

DESCRIPTION

The AL8807AEV3, 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 1A into a single LED, or

multiple LEDs, the maximum number of which depends on their total forward voltage drop and the

supply voltage.

The operating voltage is between 6 and 36 volts, but it must be greater than the voltage drop across

the LED chain. 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 output current, 1A, is set with the 0R1 sense resistor, R1.

Terminal CTRL provides a connection point for DC dimming.

Warning: At 36V nominal operation with 1A output, the LED will be hot and very bright

Figure 1: AL8807AEV3 evaluation board and connection diagram

1-8

LEDs

6-36VDC

V

+