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芯片TPS55288不工作

Other Parts Discussed in Thread: TPS55288

应用TPS55288做BUCK-BOOST电源,输入9-16V,输出12V/1.6A 用的外部反馈,固定12V输出,芯片有供电,也没有欠压保护,但是不发驱动,输出也没有,不知道原因是什么?