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tps65217c的sys输出为方波

Other Parts Discussed in Thread: AM3354

焊了5块板子,发现给AM3354供电的pmic TPS65217C无输出电压,用示波器发现4块TPS65217C的SYS输出变现为10hz的方波,另一块TPS65217C输出为窄脉冲方波。测试了 TPS65217C所有输入和输出电,没有发现有短路的。

测试波形如下:

 TPS65217C原理如下

请各位大侠帮助分析问题。

谢谢!