Unknow mosfet

[Perry Babin]

I don't understand. When you listed the 'p' version have you been too lazy to type out PBF?

 

[picco76]

I don't understand. When you listed the 'p' version have you been too lazy to type out PBF?

Now i understand! PBF= Pb free?

 

[Perry Babin]

That doesn't answer my question.

 

[picco76]

That doesn't answer my question.

Yes i mean IRF540PBF, sorry

 

[picco76]

Now with IRF540 seems to be ok. Oscillator problem remain but i think to solve with change.

 

[picco76]

Now with IRF540 seems to be ok. Oscillator problem remain but i think to solve with change.

Hi, i have changed pwm generator but i have the same problem

 

[Perry Babin]

What is the DC voltage on pins 1 and 2 of the PS driver board.

 

[picco76]

What is the DC voltage on pins 1 and 2 of the PS driver board.

106vpp, is strange, with original sg3525 is better, with st version this problem is bigger..

 

[Perry Babin]

See attached.

 

[picco76]

See attached.

Sorry
I will check and let you know

 

[picco76]

See attached.

I have 0,0175V, now i have assembled this ampli with all frames, i don't have the istability problem... this is strange

 

[Perry Babin]

Are you saying that both terminals 1 AND 2 have precisely the same voltage and it's less than 0.02v?

 

[picco76]

Are you saying that both terminals 1 AND 2 have precisely the same voltage and it's less than 0.02v?

Yes, i have misured between 1 and 2 pins. With black probe to gnd i have 2.8V and 2.7V

 

[Perry Babin]

The question was:
What is the DC voltage on pins 1 and 2 of the PS driver board.

Not across pins 1 and 2.

Looking at the 2 terminals with a scope, is either noisy?

 

[picco76]

The question was:
What is the DC voltage on pins 1 and 2 of the PS driver board.

Not across pins 1 and 2.

Looking at the 2 terminals with a scope, is either noisy?

This is the situation.