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TPS61288: 重负载输出电压不对

Part Number: TPS61288

TPS61288输入3.6V,输出12V.在PFM模式下一切正常,加大负载后,输出1A以上的电流发现电感啸叫(电感是数据手册里推荐的104CDMCCDS-2R2MC),输出电压被拉低,且随着负载电流越大拉低越多。且输入电压被拉高。请问是什么原因??