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LM25088带负载输出电压跌落问题

用TI工具设计出来的参考原理图设计和元件参数(22~30v输入、12V输出),

产品电路板上有3路DC-DC电路,其中2路带上负载时候可以正常输出12V,另外一路接的负载越重输出电压跌落的越厉害。3路DC-DC元件参数和设计相同、负载相同。

请问其中一路输出电压电路是什么原因谢谢?