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Bruce Grenade
03/26/06 09:16
Read: 408 times

#113132 - Good Good
Responding to: Bruce Grenade's previous message
Thanks for the explanation Russell. I did a quick simulation with a PNP and it works perfectly and I understand why the PNP is a better choice in this situation..

Why do I never see engineers use BJT's for switching off supplies? I've seen many times where an engineer specs an expensive MOSFET in situations where the "On resistance" doesn't matter and the circuit they are switching off is well below general purpose current levels.


List of 7 messages in thread
Switching an IC off using BJT?      Bruce Grenade      03/25/06 21:36      
   Try using a PNP        Russell Bull      03/26/06 00:49      
   Good Good      Bruce Grenade      03/26/06 09:16      
      "expensive" is relative      Erik Malund      03/26/06 10:55      
         Of course      Bruce Grenade      03/26/06 11:47      
   Using a MOSFET makes sense        Kai Klaas      03/26/06 16:28      
      Good Info      Bruce Grenade      03/26/06 17:03      

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