AL9910EV4

Issue 4 – June 2011

www.diodes.com

© Diodes Incorporated 2011

2

DESCRIPTION

The AL9910EV4 is an offline non-isolated LED driver Evaluaton board designed to work on both 115V and

230V AC line voltages. It provides a constant LED current output which drives a single string of between14

and 18 LEDs, with a LED current of 180mA.

The evalution board is designed with a footprint to fit iinside a T8 LED fluorescent replacement lamp tube. It

will provide a total LED power ranging from 7W to 10W.

AL9910EV4 SETUP AND TESTING PROCEDURE

Prerequiste

1.

AL9910EV4 evaluation board.

2.

A set of 180mA LEDs strings with 14 to 18 series-connected LEDs. The LEDs should be mounted on a

heatsink capable of a power dissipation of 7 to 10W.

3.

For safety reasons during testing, please use an isolated 115V or 230V 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 115VAC or 230VAC.

2.

ENSURE THAT THE AC SOURCE IS SWITCHED OFF OR DISCONNECTED.

3.

Connect the anode wire of the LED string to the LED+ terminal which is located at the right hand side of

the evaluation board.

4.

Connect the cathode wire of the LED string to the LED - terminal which is located at the right hand side of

the evaluation board.

5.

Connect a voltmeter & ammeter according to the connection diagram in Figure 1, if LED current and

voltage measurements are required.

6.

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

evaluation board.

7.

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.

8.

Turn on the mains switch. LED string should light up with LED current of 180mA +/-15%. DO NOT TOUCH

THE BOARD, LEDs OR BARE WIRING.

Caution: The AL9910EV4 is a non-isolated design. All

terminals carry high voltage during operation!