hi ericgibbs


Could you please check if there's any problem with this circuit?
Is diode D1 protecting the gate correct or incorrect?
What is the value of R5?

 

hi AK,
The diode is not protecting the MOSFET Gate.
Look at this option.
E

 

hi AK,
The diode is not protecting the MOSFET Gate.
Look at this option.
E
View attachment 360694View attachment 360698

How to protect the gate?

 

Hi,
Use the circuit I posted, and check the Gate/Source voltage, you will see that it is limited to approx 11V.
E

 

hi ericgibbs
Can I replace a P-type MOSFET with an N-type MOSFET? I noticed the IR2110 controller circuit only uses N-type MOSFETs.

 

hi AK,
Please post a draft circuit showing how you see a NMOS replace the PMOS so that we can discuss it operation.
E

 

hi AK,
Please post a draft circuit showing how you see a NMOS replace the PMOS so that we can discuss it operation.
E

 

hi AK,
The problem when using a NMOS as a Source Follower circuit, is that the Vgs voltage is limited by the voltage drop across the Source Load, so the Vsource voltage can never be 24V.

E

 

Chào ericgibbs
Vậy là không còn cách nào khác để kết nối chúng, đúng không? Vậy thì chúng ta phải dùng MOSFET loại P, phải không?
Mod: translated.
Hi ericgibbs
So there's no other way to connect them, right? Then we have to use P-type MOSFETs, right?

 

hi AK,
If one end of the 8R load must be connected to 0V, then a PMOS is the best solution that will give a full 24V swing across the 8R load.
E

Nếu một đầu của tải 8R phải được nối với 0V, thì PMOS là giải pháp tốt nhất, nó sẽ cung cấp điện áp dao động đầy đủ 24V trên tải 8R.

 

hi ericgibbs
Does diode D1 have gate protection for the MOSFET? Is it okay to remove diode D1?
Because R4 and R1 divide the voltage to 12V.

 

hi AK,
That diode serves no purpose, remove it.
The MOS Vgs is limited to 11V.
E

 

hi ericgibbs
I tested turning off the input signal to 0V. I see the gate MOSFET P pulling up to 24V.
So, is there anything wrong with the P MOSFET? Is the P MOSFET damaged?

 

hi AK,
The VGate to VSource voltage is Zero volts, the PMOS is Off, non Conducting

E
Added: Is this project a Homework or College assignment.??

 

hi AK,
This simulation uses a 0V through +5V voltage input, note switch On voltage for the NMOS Vgs, it is OK.
E

 

hi ericgibbs
So my circuit is safe, right? Should diode D1 be removed?

 

YES!

Added: Is this project a Homework or College assignment.??

 

YES!

Added: Is this project a Homework or College assignment.??

I am not a student.

 

hi ericgibbs
Is there something wrong with my circuit?
Does diode D2 have gate protection?