MOSFET ORing circuit simulation (LTspice)

Status
Not open for further replies.

udhay_cit

Full Member level 6
Joined
May 16, 2008
Messages
346
Helped
37
Reputation
74
Reaction score
37
Trophy points
1,318
Visit site
Activity points
3,895
Hi,
My LTspice circuit simulation for MOSFET power supply ORing circuit is blocking the reverse conduction?
Still I didn't tried this circuit practically. Now I need to use this circuit for one of my project and I did the simulation first.
Unfortunately the MOSFETs are conducting in reverse direction and not working as per my expectation.

Any one used this type of circuit in real time application? Why the MOSFETs are conducting in simulation? Am I doing anything wrong?

Udhay
 

Attachments

  • MOSFET ORing.rar
    545 bytes · Views: 198
  • MOSFET OR.png
    42.3 KB · Views: 274

Sort by date Sort by votes
Hi,

Why do you think there is a reverse current protection? I can´t see.

Both MOSFETS are ON, because both V_GS is beyond the threshold level.

My recommendation:
Look for "ideal diode" circuits.

Klaus
 

Upvote 0 Downvote
Hi,

To me, it looks like two parallel PMOS, and that seem to be backwards wrt their respective power supplies, so they'd always conduct. Could be pesky body diodes.
 

Upvote 0 Downvote
udhay_cit said:
the MOSFETs are conducting in reverse direction and not working as per my expectation.
Click to expand...
What is your "expectation" of the circuit.

That circuit will protect against reverse polarity of the input source, but will not provide a power-OR function.
 

Upvote 0 Downvote
Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…