Issue 1 – December 2011

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© Diodes Incorporated, 2011

AL8807EV3 EVALUATION BOARD USER GUIDE

DESCRIPTION

The AL8807EV3, Figure 1, is a double sided evaluation board for the AL8807 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 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, 1A, is set with the 0R1 sense resistor, R1.

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

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

Figure 1: AL8807EV3 evaluation board and connection diagram

1-8

LEDs

6-36VDC

V

+