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TPS5430烧坏

Other Parts Discussed in Thread: TPS5430

新做了一批板子,电源使用的是TPS5430; 24V转5V(5V输出电流不会超过0.2A);  芯片底下的焊盘已经接地散热;烤机的时候很多TPS5430都炸了(200pcs大概有20pcs炸了),烧的是24V输入管脚,击穿了。咋回事?