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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.
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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.
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