Suited for both automotive and consumer backlighting LCD displays, the A8513 single-output white LED (WLED) driver integrates a current-mode boost converter with an internal power switch and one current sink. The device can operate from a single power supply from 4.5 to 40 V, to accommodate start/stop, cold crank, and load dump requirements.
A 2-MHz boost converter switching frequency allows the A8513 to operate above the AM radio band. If required, the fault flag can be used as part of a circuit to drive an external P-FET to disconnect the input supply from the system in the event of a fault.
The driver provides protection against output short and overvoltage, open or shorted diode, open or shorted LED pin, shorted boost switch or inductor, shorted ISET resistor, and IC overtemperature. A dual level cycle-by cycle current limit function provides soft start and protects the internal current switch against high current overloads. It is housed in both eMSOP-10 and eTSSOP-16 packages.(ea/1,000, A8513KYLTR-T,$1.18; A8513KLPTR-T, $1.25 — available now)
By Christina Nickolas
Allegro MicroSystems , Worcester , MA
Sales 508-853-5000
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