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TPS55340电压升不上去、

Other Parts Discussed in Thread: TPS55340

你好,

输入:3.5V-4.2V

输出:5.1V

参考了WEBENCH设计了原理图:

原理图:

PCB:

焊接好以后,发现的问题是,

不接负载时,输入3.91V,输出5.05V

接上3.3欧姆的电阻后,输入变为3.7V,输出也变为3.7V,并且电感吱吱响。

二极管选用的是推荐的型号的二极管。阻容值也都是推荐值。