LTSPICE advice

Status
Not open for further replies.

Mosaic

Well-Known Member
Hi all:
I am simulating this NFET polarity protector for a battery operated circuit.
Somehow the spice shows current conducting with the battery (voltage source) in reverse polarity, can anyone clear this up?

The sim does both configs , the left sim. is fine, the right confuses me by conducting.


thx!
 

Attachments

  • batt_polarity.asc
    1.3 KB · Views: 147
In the right-hand circuit there is conduction through the FET body diode (from source to drain).
Google 'fet body diode' for images showing that.
 
Ok, I made a mistake , the Drain/Source was swapped.
Works now
 

Attachments

  • batt_polarity.asc
    1.4 KB · Views: 133
Status
Not open for further replies.
Cookies are required to use this site. You must accept them to continue using the site. Learn more…