September 2018
www.diodes.com
© Diodes Incorporated, 2018
AL8400QEV1 EVALUATION BOARD USER GUIDE
DESCRIPTION
The AL8400QEV1, Figure 1, is a double sided evaluation board for the AL8400Q linear LED driver.
The evaluation board is preset to drive 150mA through the LED string, the maximum number of which
depends on their total forward voltage drop.
The operating voltage is between 4 and 18 volts, depending on the LED string to be driven. Higher
voltages for longer LED strings can be used by tapping off the board Vin from an intermediate point in
the LED string.
Note: The evaluation board does not have reverse supply protection.
The sense resistor R2 of 300m
Ω sets the LEDs nominal current at 150mA.
Figure 1: AL8400QEV1 evaluation board and connection diagram
AL8400QEV1 Connection Point Definition
Name
Description
Vin
Positive supply voltage. 4 to 18V
GND
Supply Ground (0V)
LED A
LED A connects to the external LED string anode
LED K
LED K connects to the external LED string cathode
4-18VDC
LEDs
V
V
