| Created by |
|
| Created | May 02, 2012 |
| Last modified | May 07, 2012 |
| Tags | No tags. |
Simulate the use of a Pmosfet as a perfect diode.
I needed a diode in a power supply protection circuit, but wanted to reduce the power lost in the diode. I have read that a Pmosfet could be used as an ideal diode, so I wanted to check this and determine the actual effective resistance of the device when it is conducting in the forward direction.
As well as verifying that it does indeed act as a near perfect diode, the simulation also calculates the effective resistance (V/I).
Using a cycle of a sine wave as a sample waveform which goes positive then negative, the simulation shows the diode action, and that when conducting in the forward direction, the resistance is close to 100mOhms.
A simple but very useful simulation.
|
Hi Gary, Good thinking but depending on how you want to use the idea, there may be a couple of things to watch out for ... F5 to run a time domain simulation. It's also worth looking closely at what happens when Vin is small, i.e. before the PMOSFET actually turns on. You can just see it on your original circuit at the start and end of the conduction half cycle. :) |
May 09, 2012 |
Please sign in or create an account to comment.
Only the circuit's creator can access stored revision history.
