| umut1001 |
| hi..i am from uludag university electronic engineering student from Turkey..i need a 250-350watts class d schematic..i couldnt find i want..do you have any schematics..if you help i will be happy...:smash: |
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| Netlist |
This website may contain an unwanted script:
/Hugo |
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| umut1001 |
| sorry but it is not i want.. |
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| richie00boy |
| quote: | Originally posted by Netlist
This website may contain an unwanted script: |
Appreciate the warning, but opur systems detect nothing. What software do you use? Some can give false positives.
| quote: | Originally posted by umut1001
sorry but it is not i want.. |
Surely for a university project you should be designing something yourself, not copying from a schematic. Even if you just make a basic low frequency amp yourself, that would be good if you explain how it worked and why you had to do it like that.
Hoscakal :) |
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| Netlist |
| quote: | Originally posted by richie00boy
Appreciate the warning, but opur systems detect nothing. What software do you use? Some can give false positives.
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Antivir, but well known among many other scan engines.
http://www.google.be/search?sourcei...GGLG:nl&q=psyme
The devil is in the popup.
/Hugo |
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| richie00boy |
| OK, we have popup blocker. |
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| umut1001 |
| hey richiboy have u ever been to istanbul Turkey?i am from istanbul..you say right it is okey..i am working on class d amplifier on electronic workbench..but there is no low and high side drivers in tihis program..i cant use it..thd is 8per cent minimum..do you know a better program..thank u..hoscakal byeeee:) |
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| Whortless |
Hi, Umut
I am from GYTE department of Chemistry. Although my profession is PhD in Chemistry I am interested with electronics as hobby. Any way, Workbench is not a good simulation program and it always fails( not doing the simulations correctly). If you would like to simulate some switching circuits , i suggest you to free linear's LT spice. You can simulate Philips' UCD or RX-5's versions in LT spice. I do not know, if LT spice has drivers or others in it. What kind of driver you would like to use? IR2110,2113,2104,2105 or other drivers supplied from other manufacturers like intersil HIP4080,4081,2111 etc. I suggest you to use intersil's HIP series. They also have a class-d amp eval board with shematic. I have some shematics also. If you want please contact me.
Regards
Ferda |
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| umut1001 |
| we can meet on msn ..my mail is umut1001@hotmail.com ..lets speak Turkish then:)bana 250 watt amfi devresi lazım..20hz 20khz arası ses verebilecek bir devre olması lazım..şu anda elimde 4tane ir2110 var ama bu driverlar sanırım audio icin tasarlanmamis..dedigin entegrelere bakacagim..ben irs209555 dusunuyordum ama senin dediklerinden de olabilir..beni eklersen konusuruz.. |
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| Cal Weldon |
Hi umut,
We would appreciate it if you stuck to English when posting here. It makes it easier for others to join in.
Thank you. |
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| Whortless |
| quote: | Originally posted by Cal Weldon
Hi umut,
We would appreciate it if you stuck to English when posting here. It makes it easier for others to join in.
Thank you. |
Hi Cal Weldon,
I am not an attorney and you are true. He should write in English. Any way, He says; "I need a 250W class-D amplifier shematic, it should work in full audio band. I have 4*IR2110 to make the circuit but, I think they are not desined for audio application. If you add me to MSN we can speak on the subject." ...
I think this translation is OK for everybody.
Regards |
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| Whortless |
Hi Umut,
As Cal Weldon said you should always write in English here.
Hıım, I am now desinging a class-d amp with HIP4081. Although it is similar with IR2110 but including two drivers and also delay adjusment, my desing is not working with IR2113(2110). The reason may be the dead time. The output mosfets IRF540 mostly used in class-d amps here. I also desined some smps with IR 2113 but i did not like the output wave form( it was like a sinus instead of square). Therefore i won't suggest you to IR2110.
I added you to my MSN, we can speak tomorrow if I have time for you.
Regards |
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| umut1001 |
| i bought 8 pieces of irf540n 1month ago..i looked at the datasheets of mosfets..because of technical reasons i think irf540n is better than irf 540 ..we will talk on msn..see u soon |
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| Whortless |
Yes U can be right.
But, please pay attention to your mosfets. If writing "CHINA" on them, i suggest you to put them into dustbin :). Pay attention to ST vs IR. ST's IRF540 is more suitable for a class-D amp from IR's IRF540N. I think your prefrence on RDSon. But you should consider; Qg,input capacitance,Tr,Tf ,etc.values. Then, if you buy ST's IRF540 you can use it in an IRaud amp. And another note, IRF540 Vds is 100V. Therefore, your total supply voltage mus not exceed 100V with spikes.Probably +-40V will be quite and you can calculate what will be the max output power of your amplifier (based on the speaker impedance).
see u |
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| umut1001 |
| hi my friend Ferda..thanks..of course i always pay attention on electronic devices..i bought it from ozdisan electronic karakoy:)it is a big saler and sells original parts..my mosfets are ir..also gate drivers are original ir..q values and rds values are important.. but i think to use smps mos to get more power..because i need 250watts rms..whatever..see u soon |
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| umut1001 |
| i bought many pieces of ir2110 1n4007 1n4148 bc546 and uf4007..and i want to buy a fast opamp to be a comparator..i found lm311 lm319..i couldnt find lt1016..which one i must buy? |
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| richie00boy |
| If you want 250 watts you will need to make a fully bridged output, or change to MOSFETs that can take higher voltage. |
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| luka |
Hi
For 250w into 4 ohmes, 100v ones are enough |
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| kikikaka |
hello Umut!
i'm in the same shoes.... i'm in a graduation project of class-d, so i built a reconstructed version if international rectifier's iraudamp1.
i used almost only SMD components.
TLC072 as an integrator, LM311 as a comparator, 74HC132 for a start-up circuit (schmitt-trigger nand), IR2110 as driver, and IRF540N (irf) mosfets. i also added an RCD circuit for deadtime control (R is a trimmer) the level shifter transistor is the cheapest :), BC856.
most of the transistors (for protection, and latch) are BC856 and BC846.
the amp is ready, and in box, sounds good, but i've smaller distorsion problems.
i can help you, if You've questions, but i wouldn't like to give out my schematics and PCB-s, i worked for them a lot... |
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| richie00boy |
| quote: | Originally posted by luka
Hi
For 250w into 4 ohmes, 100v ones are enough |
Ahoj,
100v devices are on the absolute limit, as the DC rails needed are 49 volts. At idle the supply may be higher than 50 volts. Certainly, if you use a 40 volt transformer then you will need 100+ volt devices. |
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| umut1001 |
| hi..no problem..i worked a lot too..i am looking it for 2 months..to get lower distorstion i prefer you to use irf540 st mosfet instead of irf540 n..because it has lower input capacitance..best regards |
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| kikikaka |
| Thanks a lot! Maybe it's a good idea. But I'm afraid it's impossible to purchase IRF540 here. 540N is sold everywhere... |
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| umut1001 |
| thanks hahahaaa...do not help anyone.do not share anything..everybody helps you:devilr: |
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| kikikaka |
No, no no!
I'm sorry. I think I was too raw few post earlier, and this caused a kind of misunderstanding...
I didn't say, that I won't help, just only that I don't want to share my whole project (including PCB, detaliled schematics, etc....)
I have a reason for that: I'm in the middle of my graduation process, and I don't want anyone to have suspicions about me of stoling my whole project from this forum.
Regards,
kikikaka |
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| luka |
Hi
That's ok, but still you can post some pictures of it. Always great too see new things |
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| kikikaka |
After taking this picture i had a smaller modification: decoupling protecting and signal ground.
Instead of shorting them together i put parallel R and antiparalel diodes to avoid hum and other noises came from earth-loop. |
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| luka |
Hi
Wow. Thats my response. Next thing would be to replace toroid with smps. How powerfull is it, the amp? |
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| kikikaka |
It's only 2*90W @ 4 Ohm @ about 1% THD. But it's far enough for my room...
But the problem: about at 25% power some distorsion can be seen on a scope. It' like on the attached image (that is from irf's class-d tutorial), but only on the lower halfwave. And it's seems to be independent from frequency.
I can hardly imagine how dead-time causes a distorsion like that....
As Umut said, i purchased four IRF540 (st) instead of IRF540N (irf), but they have a text 'CHINA' on them. Someone wrote that these are good only for the dustbin. What's the problem with them?
(sorry for the picture, but in the original document text and arrows are in the wrong place too) |
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| luka |
Hi
They are probably right. I have bought few 2n3055 from toshiba. I had 4 of them in parrallel for current sharing in supply. They are 15A each, but when I went with output current to 5A one of them got "smoked". So I had to replace them with the same from SGS. They worked well over 10A without problem.
So here is probably the same.But note that that "N" is there for a reason. N version has lower Rds-on, bigger current,...
Yea 2x100 is more then enough for normal room |
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| Whortless |
Hi Kikikaka,
As Umut said, i purchased four IRF540 (st) instead of IRF540N (irf), but they have a text 'CHINA' on them. Someone wrote that these are good only for the dustbin. What's the problem with them?
If you would like to damage your drivers, U can use "China" marked IRF540s. I agree with Luka, yes 540N has lower Rds on. But St's 540 has lower input capacitance and lower Qg. But, usually Rds on value has a reverse balance with Qg.
Hıımm, China marked mosfets may be IRF510 or other lighter mosfet than 540. They could be celaning the original mark and then marking them as IRF540 or so. I tested them on my desings, they can only work for 5-10 seconds while original IRF540 can run for several hours without damage. I got china marked ones for 0.5$ while the original is on the same price and finnaly two fake 540 damaged my HIP4081's one channel.
Kind regards |
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