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TPS55340芯片接负载后输出降低



芯片不接负载时输出电压正常,当接上负载后输出降低,正常输出为12v,用11欧功率电阻进行测试时,电压为7.4v,用33欧功率电阻进行测试时输出为10v,均到不到要求的12v,求解,急