AL5802EV1
Issue 1 – October 2011
www.diodes.com
© Diodes Incorporated
2
Quick Start Guide
Required Test Equipment
20V 1A adjustable power supply, Digital Multi-Meter (DMM) and low current LEDs
Constant Current LED Driving Operation
1. Set the power supply to 20V for a string of 5 LEDs.
2. Set the current limit to 200mA.
3. Connect up the AL5802EV1 to the equipment as in Figure 1 above.
4. Set DMM to measure the LED current.
5. Set jumper to JP1 position. Only one jumper should be fitted at any time.
6. Switch on the power supply and check that the LED lights up.
7. Check that the current measured on DMM is 100mA +/- 10mA.
8. Switch off the power supply and set jumper to JP2 position.
9. Switch on the power supply and check that the LED lights up.
10. Check that the current measured on DMM is 50mA +/- 5mA.
11. Switch off the power supply and set jumper to JP3 position.
12. Switch on the power supply and check that the LED lights up.
13. Check that the current measured on DMM is 20mA +/- 2mA.
AL5802EV1 Schematic
1nF
C1
GND
Vin
ENABLE
LED A
LED K
3R
R1
11R5
R2
28R
R3
1
2
JP1
1
2
JP2
1
2
JP3
VCC
GND
CATHODE
Anode
1
OUT
OUT
2
BIAS
BIAS
4
GND
GND
3
EN
EN
5
REXT
REXT
6
REXT
REXT
U1
AL5802
Figure 2. Evaluation board schematic diagram
