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UC2625 问题

Other Parts Discussed in Thread: UC2625

Hi

      我在使用TI的无刷直流电机控制芯片UC2625时出现控制逻辑异常情况,具体情况表现为:三相霍尔电平正常情况下,应导通的上桥及下桥功率器件出现无规律性关断情况,造成电机反电势波形异常,检测为UC2625输出的栅极驱动信号异常;此时检测TACH-OUT引脚波形,发现在三相霍尔状态未发生跳变的情况下,TACH-OUT引脚有脉宽电平输出,且该电平频率与反电势波形异常处相对应。

     由以上现象是否可以推测芯片内部逻辑混乱?造成这种情况的原因可能有哪些?是否有较好的解决措施?