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电源正常时PG脚输出高电平还是低电平？用ＰＧ脚控制ＤＣ TO DC的EN脚，EN脚是高电平开启，那么PG脚是直接通过电阻串接到EN脚还是通过NMOS管做电平转换后接到EN脚？
HI
PG正常高电平输出, 使得DC/DC EN高电平启动工作。PG是芯片内部MOS接口，需要外部上拉，然后PG可连接到EN脚。
