UCD 25 watts to 1200 watts using 2 mosfets

[manojtm]

Manoj, Please do not post password protected materials to the forum - anything posted here must be available to all members without exception. Attachments here are not available to non members.

In the future please ask people to PM you for files you are unwilling to share at large.

Let's get back on topic, people please do not post requests for passwords here, PM Manoj directly.

Sir,

i can't give any schematics without protection on open forum. many of them watching and downloading without any effort. I will give only those who are hardly trying/making the subject.
PM there is no attaching icon so pls provide it

Regards
MANOJ

 

[CPX]

manojtm , you still made no distorsion tests , it seems no one it is willing to make the effort, so i ask you to make it since you want it from others...

 

[red_zone003]

Thank for the reply Manoj. You could give me a proper full bridge amp schematic? I have very large speakers and is very hard to drive them, even with my 600w/8ohm amplifier.

 

[andrewlebon]

ocp feedback

Hi
greetings how does OCP work in detex audio amp the one with LM311 NE555 and 10K preset i mean is it effective and working good feedback needed
warm regards
andrew lebon

 

[manojtm]

Hi CPX

my old design test result was i feel bad (THD 2.5%@mid level).I dn't check new design
i will post you shortly.
Regards
MANOJ

 

[Pafi]

Hi red_zone003,

That will not work. IR2110 high and low input change it will not switch. so don't go

Regards
MANOJ

??? I haven't check everything, but that part is correct. I have no idea what do you think to be wrong.

 

[CPX]

MANOJ,
Use my testing methodology to be able to compare results.
2.5% is normal for clipping only.

 

[red_zone003]

Pafi, maybe you can help me with a better amp? I don't need protection scheme or something else, only a good and tested full bridge desing with ir2110/2113. Thanks.

 

[stewin]

hi mano will your old design work comfortably with irfp250 at +/- 75vlts with 2ohms load

 

[Pafi]

red_zone003!
Sorry, I don't have an easy-to-build one.

 

[red_zone003]

I will give it a try with this one next week...hope it will work at 100v. What do you think?

 

[exflaco]

Pafi your request

 

[exflaco]

Bridge

Another choice

 

[ionutzxpo]

hi exflaco,post the LAY if you have it

 

[stewin]

Another choice

which fets are being used for output and can it do 2ohms in bridge mode?

 

[Pafi]

Pafi your request

Not mine. red_zone003 asked. And he asked a good and tested design. Did you test it?

stewin!

FDP2532, it's on the schematic. In my first bridged amp I used 8 pcs of FDP2552 (2552 is the half of a 2532), and it worked on 2 ohms, so there is a chance.

 

[stewin]

Not mine. red_zone003 asked. And he asked a good and tested design. Did you test it?

stewin!

FDP2532, it's on the schematic. In my first bridged amp I used 8 pcs of FDP2552 (2552 is the half of a 2532), and it worked on 2 ohms, so there is a chance.

thanks paffi .

i have seen FDP2552 datasheet it is similar to irf540n. meaning at +/- 40vlts with bjt buffer irf540n can used eight pieces per channel at bridge mode with a 2ohms load... please correct me if i am wrong.

>>>>can i take my chances with 8 pieces irfp250n per channel using output buffer at +/-75vlts?
>>>>if it cannot work how many pieces of irfb4227 do i need per channel to make it work full bridge +/- 85vlts 2ohms of course with a bjt buffer to parallel the output fets?

 

[CPX]

Calculate maximum needed peak current, add at least 30% for safety and divide it to 100 degrees current of each mosfet.

In this case:75 volt peak in 1 ohm(2 ohm bridge)= 75 amp peak=>98 amp peak(with safety) =>irfb4227 has 46A at 100 degrees so you need 2.13 pairs, it will work with 2, but for short circuit protection(or +-85 supply) you will need 3 pairs..

 

[stewin]

thanks a lot cpx . in that case irfp250n/260n have to be like five pairs per channel t +/-75vlts and 2ohms bridge for irf540n at+/-40vlts 4pairs is that correct? and also

>>>which are the best pairs for output fet buffers among the below
2n5551/5401 , 2s/c2655/a1020 ,2s/a1013/c2229 , bc327/337 , bc368/369 , bc546/556 , bd139/140, mje 340/350

thanking you in advance

 

[CPX]

The ones with highest gain and current, but personally i would use dedicated drivers like tc4420