Troubleshooting P-Channel MOSFET Switching in Electrical Power Systems

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The discussion centers on troubleshooting an issue with P-channel MOSFETs in an electrical power system where all seven MOSFETs turn on simultaneously when one is activated. The circuit design includes gates connected to ground and sources linked to a microcontroller. The user suspects that the microcontroller may be sending high signals (1s) to the sources of the P-channel MOSFETs, which keeps them all turned on. There is a request for a schematic to better understand the setup and diagnose the problem. Clarification on the signals being sent from the microcontroller is crucial for resolving the issue.
urb
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Hi all,

I'm using 7 P-channel mosfets to switch different loads using 1 microcontroller on an electrical power and distribution system. My circuit is as follows for each of the 7 Mosfets.

Gate: through a resistor to ground on microcontroller and through a High value (600 kilaohms)
Drain: to load
Source: I/O line from microcontroller and input power

So all the gates are interconnected to the ground on the cpu

The problem I'm having is that when I turn one mosfet on all the mosfets turn on and I can't figure out why. I am unable to use N-Channel mosfets. Any help on this matter would be very very appreciated
 
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Are you sending 0s or 1s from microcontroller to source of PMOSs when all of them gets turned on ?

if the gate is connected to gnd, sending 0 to PMOS's source will turn it off, but sending 1 keeps it turned on all the time. I suspect that your microcontrollers are sending 1s to all the PMOSs.
 
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I don't understand what you have from your description. Can you post a schematic?
 

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