[原创] Allegro A6862汽车三相固态继电器MOSFET驱动方案

Allegro MicroSystems公司的A6862是N沟功率MOSFET驱动器,具有三个独立的浮置栅极驱动输出,集成的电荷泵控制器稳压器在电源电压降至4.5V时有足够的栅极驱动电压大于7.5V,电源电压4.5V-50V,两个单独的激励输入,单个相位使能输入,主要用在ASIL系统的三相断开,电动助力转向系统(EPS),电制动和三相固态继电器驱动器.本文介绍了A6862主要特性和优势,框图,典型应用框图,以及演示板电路图,材料清单和PCB设计图.

The A6862 is an n-channel power MOSFET driver capable of controlling MOSFETs connected as a 3-phase solid-state relay in phase-isolation applications. It has three independent floating gate drive outputs to maintain the power MOSFETs in the on-state over the full supply range with high phase-voltage slew rates. An integrated charge pump regulator provides the above battery supply voltage necessary to maintain the power
MOSFETs in the on-state continuously when the phase voltage is equal to the battery voltage. The charge pump will maintain sufficient gate drive (>7.5 V) for battery voltages down to 4.5 V with 100 kΩ gate source resistors.

The three gate drives can be controlled by a single logic-level input. In typical applications, the MOSFETs will be switched on within 8 μs and will switch off within 1 μs.
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