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20th June 2012, 01:38 AM
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#1 |
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diyAudio Member
Join Date: Jun 2010
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smps for car audio with TL494
hi guys
i make this threads for car audio smps please help to your friends to make smps for car i have TL494 IC and ETD39 and IRFZ44n mosfet. is this good? can you help me please? 
Last edited by Hadighorbani; 20th June 2012 at 08:26 AM. |
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20th June 2012, 08:32 AM
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#2 |
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diyAudio Member
Join Date: Jun 2010
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20th June 2012, 08:40 AM
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#3 |
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diyAudio Member
Join Date: Feb 2008
Location: Jackson,michigan
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20th June 2012, 07:42 PM
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#4 | |
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diyAudio Member
Join Date: Jun 2010
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Quote:
i have about 800 number of TL494 and 1000 number of IRFZ44N and 300 number of ETD39. please help me to make smps with input 13.8 volt and output + - 25V AC thank you  sorry for my bad english |
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20th June 2012, 10:34 PM
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#5 |
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diyAudio Member
Join Date: Feb 2008
Location: Jackson,michigan
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Basically the recipe is in that thread.
You will have to reduce the amount of turns on the secondary to about 8 to 10 turns. And change the voltage divider ratio of R112+R104 and R105 from 20:1 to 10:1. Follow that the pins are connected for the same functions. I haven't messed with these types of circuits yet but it is pretty straight forward from what I can see. As I mentioned before you can simply add a small trimmer pot in the voltage divider in order to have a fine adjustment of the output voltage. That is the best as far as I can tell you since I have not made one myself yet. The only thing stopping me from trying it is that I don't have any ETD cores. But I do have an idea to use a larger toroidal power transformer in order to get a higher power capability out of it due to the higher than 60Hz switching frequency. Here is the data sheet for the ETD34, http://www.epcos.com/inf/80/db/fer_07/etd_34_17_11.pdf And here is the data sheet for the ETD39, http://www.ferroxcube.com/prod/assets/etd39.pdf According to the data sheets the ETD39 is only slightly larger in size and has about a 10% higher Al value as well, this is good. You shouldn't have any issues with core saturation with the same amount of primary turns because of this. As long as the switching frequency is the same as that for the SG3526 layout. Good Luck !! jer
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21st June 2012, 03:46 AM
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#6 |
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diyAudio Member
Join Date: Jun 2010
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Meny thanks to you
I put a link of PDF file in this thread It is shematic of one smps That work with TL494 and IRFZR44 and ETD39 Can you see that and sey to me your opinion please.? Thanks my friend to take your time to me Sorry for my bad english |
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21st June 2012, 06:22 AM
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#7 |
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diyAudio Member
Join Date: Feb 2008
Location: Jackson,michigan
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Your link goes to a site that requires me to install a downloader or something and it does not take me to the actual PDF for viewing.
Please post the actual url to the PDF so that it can be seen. jer
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21st June 2012, 07:13 AM
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#8 | |
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diyAudio Member
Join Date: Jun 2010
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Quote:
is this ok? |
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21st June 2012, 07:17 AM
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#9 |
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diyAudio Member
Join Date: Jun 2010
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wich one of this shematic can help me?
can i recive + - 32VDC 15A ? please help to do that with TL494 and IRFZ44N. i can buy another core like ETD 54 is this core good for 850w? |
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21st June 2012, 07:23 AM
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#10 | |
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diyAudio Member
Join Date: Jun 2010
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Quote:
thanks |
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