LED driver family kills PWM audible noise : Page 2 of 2

April 17, 2019 //By Christoph Hammerschmidt
LED driver family kills PWM audible noise
With a patended method, Allegro Microsystem has succeeded to eliminate the annoying noise generated through PWM modulation circuits in LED drivers. Its A8060x family of LED backlight drivers is designed with an innovative pre-emptive boost (PEB) control that eliminates this noise.

The A8060x device family is designed for all types of automotive backlighting, including Audio-Video systems as well as instrument clusters and heads-up display (HUD). These devices offer a wide input range from single power supply from 4.5 to 40 V - once started, it can continue to operate down to 3.9 V. This allows the parts to withstand stop/start, cold crank, double battery and load dump conditions encountered in automotive systems.

The A8060x is a robust family with safety and protection features required for automotive applications. The ALT80600 and A80603 feature four LED strings, each capable of up to 120 mA with total LED current of up to 480 mA. The A80601 and A80602 provide a total LED current of up to 840 mA, via 4 or 6 strings respectively.

More information on the ALT80600, A80601, A80602, A80603 datasheets.

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