Automotive-grade three-phase isolator MOSFET drivers
The A6861 is an N-channel power MOSFET driver capable of controlling MOSFETs connected as a three-phase solid-state relay in phase-isolated applications. The A6861 is intended for automotive systems that must meet ASIL requirements. In applications where safety is critical, motor isolation is a critical safety requirement that is currently addressed through discrete circuits or relays. Allegro A2-SILTM products include specific features that enable the correct system design, allowing users to achieve ASIL-D system ratings.
The A6861 has three independent floating gate drive outputs, allowing power MOSFETs that remain on (ON) beyond the full supply range in the presence of high phase voltage slew rates. The integrated charge pump regulator provides the voltage above the battery supply voltage necessary to keep the power MOSFET on when the phase voltage is equal to the battery voltage. The charge pump will provide ample gate drive (>7.5 V) for battery voltages as low as 4.5 V via a 100 kΩ gate resistor.
The three gate drivers can be controlled independently by using logic hierarchical control inputs. In a typical application, the MOSFET will start in 8 μ seconds and shut down in 1 μ seconds.
The undervoltage monitor checks that the pump supply voltage is high enough to ensure that the MOSFET remains in a safe conductive state.
The A6861 is available in a 16-pin TSSOP (LP) package with an exposed thermal panel for enhanced heat dissipation. The packages are lead-free and the pin frames are 100% matte tin plated.
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三相安全断开系统
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电子动力转向 (EPS)
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电子制动
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三相固态继电器驱动器
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3 浮动 N 通道 MOSFET 驱动
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通过 100 kΩ 栅级电阻器维持 VGS
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集成电荷泵控制器
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4.5 至 50 V 电源电压运行范围
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各个相有独立的 TTL 输入
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150°C 环境温度（165°C 焊点温度）条件
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A2-SILTM 产品 – 器件专为安全性至关重要的系统而打造