Allegromicro A4933三相马达控制方案
Allegromicro公司的A4933是和外接功率MOSFET一起使用的三相马达控制器.当电池电压低于7V时集成的电荷泵提供大于10V的栅极驱动.器件的电源电压5.5V-50V,并和3.3V与5V逻辑电平兼容.本文介绍了A4933主要特性和优势,方框图,典型应用电路以及电流检测放大器配置图.
The A4933 is a 3-phase controller for use with N-channel external power MOSFETs and is specifically designed for automotive applications.
A unique charge pump regulator provides full (>10 V) gate drive for battery voltages down to 7 V and allows the A4933 to operate with a reduced gate drive, down to 5.5 V. A bootstrap capacitor is used to provide the above-battery supply voltage required for N-channel MOSFETs. An internal charge pump for the high-side drive allows DC (100% duty cycle) operation.
Full control over all six power FETs in the 3-phase bridge is provided, allowing motors to be driven with block commutation or sinusoidal excitation. The power FETs are protected from shoot-through by integrated crossover control and resistor adjustable dead time.
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