Diodes AL8400QEV1 User Manual

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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 300mΩ sets the LEDs nominal current at 150mA.
V
4-18VDC
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
LED K
LED K
September 2018
© Diodes Incorporated, 2018
connects to the external LED string anode
connects to the external LED string cathode
LEDs
www.diodes.com

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Summary of Contents for Diodes AL8400QEV1

  • Page 1 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.
  • Page 2 Output. Connect a capacitor close to device between OUT and GND. ORDERING INFORMATION EVALBOARD ORDER DEVICE ORDER NUMBER NUMBER AL8400QSE-7 AL8400QEV1 Please note: Evaluation boards are subject to availability and qualified sales leads. September 2018 www.diodes.com © Diodes Incorporated 2018...
  • Page 3 AL8400QEV1 AL8400QEV1 EVALUATION BOARD REFERENCE DESIGN Figure 2: AL8400QEV1 Schematic The AL8400Q provides a simple linear LED driver in the form of a constant current circuit. The device will drive the base of the external transistor, Q1, appropriately to maintain a voltage of 0.2V at the FB pin.
  • Page 4 For the circuit as set the nominal current is 154mA (0.2/1.3 = 0.15384…). The worst cases are 163mA (0.210/1.287 = 0.16317…) and 144mA (0.19/1.313 = 0.14470…). This gives approx 10mA possible variation over the nominal 154mA, about 6.5%. September 2018 www.diodes.com © Diodes Incorporated 2018...
  • Page 5 Diodes Incorporated convey any license under its patent or trademark rights, nor the rights of others. Any Customer...

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