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Old 21st March 2008, 12:13 AM   #511
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Looking at the second part of the schematic, I think it's probably a 15v. It's probably a over-voltage shutdown for the B+ input.

Try this...

Pull U2. Connect pin 14 of U1 to the pad for pin 14 of U2. This will restore Vref that's being lost when U2 is removed. If the voltage drops below ~4.8v, you may have to use a 5v reg to supply the Vref. The output of the 5v reg of the 494 is very limited. The regulation will be controlled by the deadtime pin on U1. Replace R42 with a 120k ohm resistor. This should give you something close to 44v.
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Old 21st March 2008, 12:32 AM   #512
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coooool.....i knew you have a solution...

i will check it and follow as you mentioned and post the results soon !

Thanks again Perry !
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Old 22nd March 2008, 09:24 AM   #513
anjing is offline anjing  Indonesia
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Does anyone know where can I just buy of this SMPS PCB ?
Looking for +/-30 Volts

thanks
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Old 24th March 2008, 03:34 AM   #514
anjing is offline anjing  Indonesia
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anyone ??

if so, pls send me email at indosq at gmail.com
(replace the at with @)

thanks
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Old 1st May 2008, 05:22 PM   #515
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Would either of these toroids be a good candidate for a SMPS core?

Steward 35T1417-10H

OD: 36mm
ID: 23mm
HT: 15mm
Permeability: 5000

Steward 40T1417-10H

OD: 36mm
ID: 23mm
HT: 15mm
Permeability: 10000

Thanks,
David
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Old 7th September 2008, 07:04 PM   #516
norazmi is offline norazmi  Malaysia
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Default Re: Commentable Thoughts

Quote:
Originally posted by Workhorse





ThanX for ur interest
here is schematics

Bro do you have PCB top and bottom for this smps schematics?
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Old 8th September 2008, 03:04 AM   #517
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Why using SG3525. TL494 is easily available from old PC ATX power supplies. Can you replace SG3525 with TL494 in the schamatics ?

Look at this page

Thanks
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Old 8th September 2008, 07:45 AM   #518
luka is offline luka  Slovenia
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Hi

Use whatevery you want...SG has push pull outputs, TL don't. You can replace anything with anything, so SG with TL = yes you can
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Old 8th September 2008, 09:00 AM   #519
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ah.. i see... then its better to use SG3525 !

I noticed that SG application is simpler as well. Worth the try.. thnx luka
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Old 8th September 2008, 09:07 AM   #520
luka is offline luka  Slovenia
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Hi

For PP I think it is better coz you can drive fets directly, but say in buck converter, TL would be easy to use coz you have E and C of transistor in pins and you can use them however you want, so that good...

But SG really is ic that needs only few components, and you can do a lot with it and has some features like dead time and shutdown which you can use really easy...

I don't know, I like SG better...
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