AL9910EV6

Issue 4 – June 2011

www.diodes.com

© Diodes Incorporated 2011

2

DESCRIPTION

The AL9910EV6 is an offline isolated LED driver evaluation board designed to work on 110V AC line voltage.

It provides four constant LED current outputs which drive four seperate strings of between 8 and 14 LEDs, with

a LED current of 75mA per string.

It will provide a total LED power ranging from 8W to 15W.

AL9910EV6 SETUP AND TESTING PROCEDURE

Prerequiste

1.

AL9910EV6 evaluation board.

2.

Four sets of LEDs strings with 8 to 14 series-connected LEDs. Please note that the number of LEDs in

each string must be equal. The LEDs should be mounted on a heatsink capable of a power dissipation of

8 to 15W.

3.

For safety reasons during testing, please use an isolated 110V AC source from the output of an isolation

tranformer. For public demonstration, the evaluation board and LEDs should be fitted into a transparent

case with sufficient insulation to meet the local safety requirements.

Connections and Power up

1.

Preset the isolated AC source to either 110VAC.

2.

ENSURE THAT THE AC SOURCE IS SWITCHED OFF OR DISCONNECTED.

3.

Solder the anode wires of all LED strings to the LED+ terminal.

4.

Solder the cathode wires of the four LED strings individually to the LED1-, LED2-, LED3- and LED4-

terminals. Connect ammeters in series with the cathode wires if LED current measurements are required.

5.

Connect the two AC line wires to the AC1 and AC2 terminals which are located at the bottom left hand

corner of the evaluation board.

6.

Ensure that the area around the board is clear and safe, and preferably that the board and LEDs are

enclosed in a transparent safety cover.

7.

Turn on the mains switch. LED string should light up. DO NOT TOUCH THE BOARD, LEDs OR BARE

WIRING.

Caution: The input terminals carry high voltage during

operation!