Single-string white LED driver IC for LCD screens
20 March 2012
A new single-output white LED driver IC has been developed by Allegro Micro Systems Europe.
The device is designed for backlighting applications in LCD displays for automotive and consumer applications.
The chip integrates a current-mode boost converter with an internal power switch and one current sink 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 4.5 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 & 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 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 a variety of potential problems such as output short-circuit and overvoltage.
Allegro MicroSystems Europe