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TPS51315的EN_PSV脚怎么接?

EN_PSV是做什么用的?该怎么接呢?

Enable/power-save pin.Connect to ground to disable switched-mode power supply (SMPS ).Connect to 3.3V or 5 V to turn on SMPS and enable skip mode. Float to turn on SMPS but disable skip mode (forced continuous conduction mode).

该接5V还是接地?还是悬空?