Allegro – Single-string white LED driver IC for LCD backlighting applications (Allegro A8513 LED driver IC)

Feb 8 2012 - Power [More Power Articles]

The new A8513, from Allegro MicroSystems Europe, is a single-output white LED driver IC designed for backlighting applications in LCDs for automotive and consumer applications and their associated application, performance, and protection requirements.

The new device, which integrates a current-mode boost converter with an internal power switch and one current sink, is designed to provide a robust solution for applications such as automotive infotainment, cluster and centre-stack lighting, industrial LCD displays, portable DVD players, flatbed scanners, and LED lighting.

The A8513 can operate from a single power supply from 4.5V to 40V to accommodate start/stop, cold-crank and load-dump requirements. The 2MHz switching frequency of the boost converter allows the device to operate above the AM radio band.

The new device features robust FMEA (failure modes and effects analysis) performance, and constantly monitors the state of the system to determine if any fault conditions occur, with a fault flag pin alerting the controller to possible fault conditions. If required, the fault flag can be used as part of a circuit to drive an external p-type FET to disconnect the input supply from the system in the event of a fault.

Built-in protection is provided against output short-circuit and over-voltage, open or shorted diode, open or shorted LED pin, shorted boost switch or inductor, shorted current-setting resistor, and IC over-temperature. A dual-level cycle-by cycle current limit function provides soft-start and protects the internal current switch against high-current overloads.

The A8513 is supplied in both eMSOP-10 and eTSSOP-16 packages. Various oscillator frequencies are available says the company.

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