本帖最后由 QQ1530670 于 2017-3-4 08:55 编辑
工程上选用了一款宽压输入(5~36V)芯片RT8279,5V5A输出,其中使能EN脚看芯片手册说可以悬空,有人告诉我使能脚要上拉到电源;请各位大师给看看,EN脚到底上拉不上拉呢?谢谢,附件为RT8279datasheet。
关于芯片管脚的介绍:
芯片使能引脚原话:
ChipEnable Operation
TheEN pin is the chip enable input. Pull the EN pin low(<0.4V) will shutdownthe device. During shutdown mode,the RT8279 quiescent current drops to lowerthan 25μA.Drive the EN pinto high (>1.4V, <5.5V) will turn on the device again. If the EN pin is open, it will bepulled to high by internal circuit.
For external timing control (e.g.RC),the EN pin can also be externally pulled to High by adding a100k
Ωor greater resistor from the VIN pin (seeFigure 3)
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