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pnp做开关管有什么设计技巧？

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pnp做开关管有什么设计技巧？

浏览：48次 | 提问时间： 07-29 05:40

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3个答案

删除我的孤单 07-29 05:41

你好，设计技巧：为了防止烧坏三极管，基极是应该加电阻的，如果基极前面的数字电路输出电流很小就不需要了。Pnp开关电路这种拓扑结构只能是低通高断。

不毒枉为女人 07-29 05:49

对于PNP来说，使UebUon，三极管导通，其中一般Uc接地，所以要使三极管导通既要控制Ue又要控制Ub使Ueb>Uon才行。所以一般是Ue为某个固定电压值，只通过控制Ub来就可以控制三极管的导通与断开。对比NPN与PNP可知：NPN做开关时，适合放在电路的接地端使用，如图2里面Q6；PNP做开关时，适合放在电路的电源端使用，如图3。我们一般使用芯片I/O口来控制LED灯，I/O口的逻辑电平一般为高电平3V左右，低电平为0.3V左右。因此可以直接控制NPN管开关，如图2里面的Q6；一般不直接控制PNP管，如图3。我们前控板设计LED的控制电路采用如下图2的NPN三极管对地较为合适，并且双色灯最好是使用共阳双色灯。

太深的依靠 07-29 05:58

PNP是用E—B的电流（IB）控制E—C的电流（IC），E极电位最高，且正常放大时通常C极电位最低，即VC

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