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TPS40195用来做BUCK，我设置过流点特别不稳，比如想设置5A过流，结果可以设置7A，4A，就是调不到5A。请指教
过流值除了靠ILIM上电阻设置外，还与MOSFET的Rdson有关。
要较精准的设置过流点需要知道MOSFET在过流点处的导通电阻，具体见数据手册17页的公式。
