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LP8861 pin SD工作模式

求助,LP8861 在正常动作时,pin SD的电压理论上是多少?有没有用过的伙伴给个答案。

说一下我的理解

SD端子是一个恒流源,datasheet中给出的例子中,Rgs的电阻决定了SD端子对地电压,Vin减去(Rgs的阻值乘以SD的电流),

不知道这样计算对不对。

现在希望降低成本,选择更合适的mos,特来提问。

望各位大神提供帮助啊。

  • Hi
    看起来是的,230uA在20k电阻上的压降4.6V.
    对于mos的选择如下:
    A pFET transistor with necessary voltage rating (VDS at least 5 V higher than max input voltage) should be used.
    Current rating for the FET should be the same as input peak current or greater. Transfer characteristic is very
    important for pFET. VGS for open transistor must be less than VIN. A 20-kΩ resistor between pFET gate and
    source is sufficient.