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5V-3.3V给ADS1271供电，上电后就发出叫声，是因为117带负载能力不强吗？手册上给出最大能输出1A的电流。
1117只是个普通的LDO，还没见过1117发出叫声的，你的输入输出电容是多大的，负载多大。
另外AMS1117不是TI的产品。建议您咨询相关生产商。
