Hi everyone,
I've read several threads but couldn't find the answer I'm looking for.
I'm trying to protect my circuit the same way the attached schema works (using PMOS)
I've read this one:
http://www.electro-tech-online.com/...ion-of-input-power-with-low-voltage-drop.664/
and this one
from other threads
However I'm having a specific question regarding the voltage of my own circuit.
I want to support 10-26v as VIN (in fact 12v to 24v but with some margin).
I plan to use either UA78M05CDCYR or LM2937IMP-5.0/NOPB to go from 12v-24v to 5v.
My problem is that Vgs using a P-channel in this case can theoretically be at some point 0 - 26v (-26v) or 5v - 26v (-21v) and most of the Pchannel I find in the package I want are max VGS -20v.
1) Do you believe the case Vgs (-26v is possible?)
2) In the case I have 25v supply, we will be @ Vgs -20v, do you think it's a safe practice to stay close to max limit?
What do you recommend me to protect from inverse polarity?
Thanks in advance for your help!
I've read several threads but couldn't find the answer I'm looking for.
I'm trying to protect my circuit the same way the attached schema works (using PMOS)
I've read this one:
http://www.electro-tech-online.com/...ion-of-input-power-with-low-voltage-drop.664/
and this one
However I'm having a specific question regarding the voltage of my own circuit.
I want to support 10-26v as VIN (in fact 12v to 24v but with some margin).
I plan to use either UA78M05CDCYR or LM2937IMP-5.0/NOPB to go from 12v-24v to 5v.
My problem is that Vgs using a P-channel in this case can theoretically be at some point 0 - 26v (-26v) or 5v - 26v (-21v) and most of the Pchannel I find in the package I want are max VGS -20v.
1) Do you believe the case Vgs (-26v is possible?)
2) In the case I have 25v supply, we will be @ Vgs -20v, do you think it's a safe practice to stay close to max limit?
What do you recommend me to protect from inverse polarity?
Thanks in advance for your help!
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