TPS63020提供3.8V给3G模块供电，原理图参考的是TI官方的“中间电压较低的汽车紧急呼叫电源参考设计”，如附件；
出于提高轻载效率的考虑，设定TPS63020进入power save模式，既将PIN13(PS/SYNC)拉低，随后电感产生了尖锐的啸叫声，
正常模式下没有这种情况，不知什么原因，请指教，谢谢！
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