By Allegro MicroSystems, LLC 27
The A8060x family is Allegro’s latest generation of advanced LED backlight drivers. The device family is designed with an innovative and patented Pre-Emptive Boost (PEB) control, eliminating noise that is typically audible.
PEB control in the A8060x family substantially reduces VOUT ripple and eliminates the common problem of audible noise from ceramic output capacitors during PWM dimming, while also requiring less output capacitance overall. Systems can achieve an LED brightness contrast ratio of 15,000:1 using PWM-only dimming at 200 Hz. A higher ratio of 150,000:1 is possible when using a combination of PWM and analog dimming.
The A8060x device family is ideal for all types of automotive backlighting, including audio-video systems as well as instrument clusters and heads-up displays (HUD). These devices offer a wide input range from single power supply from 4.5 V 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, making this device ideal for HEV inverter, DC-to-DC converter, and electric power steering (EPS) applications.