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GigaFrog · 12-16-2001, 01:08 AM

After doing some research, I found out that most power supplies use the TL494 PWM controller that suits well this application. My PowerTronic uses it too.

Its datasheet can be found here: http://www-s.ti.com/sc/ds/tl494.pdf

This links shows some schematics on how the TL494 is used. http://www.nutsvolts.com/PDF_Files/PSRepair.pdf

Not much.
I think the error amps are where the feedback is sent.
I'll have to re-open the PSU, and this time, measure signals at the pins of the TL494.

I processed another MBM log file that was logged while various applications were runing (Sandra, mpeg4 and toast). More fluctuation is shown, with still a clear pattern between 5V and Vcore. http://www.geocities.com/alochin/temp/log1b.gif

I hope I'll figure out hot to remote sense the 5V, I am sure it would stabilize the Vcore.

12-16-2001, 01:08 AM	#3
GigaFrog Cooling Neophyte Join Date: Nov 2001 Location: NorthWest (French & US) Posts: 88	After doing some research, I found out that most power supplies use the TL494 PWM controller that suits well this application. My PowerTronic uses it too. Its datasheet can be found here: http://www-s.ti.com/sc/ds/tl494.pdf This links shows some schematics on how the TL494 is used. http://www.nutsvolts.com/PDF_Files/PSRepair.pdf Not much. I think the error amps are where the feedback is sent. I'll have to re-open the PSU, and this time, measure signals at the pins of the TL494. I processed another MBM log file that was logged while various applications were runing (Sandra, mpeg4 and toast). More fluctuation is shown, with still a clear pattern between 5V and Vcore. http://www.geocities.com/alochin/temp/log1b.gif I hope I'll figure out hot to remote sense the 5V, I am sure it would stabilize the Vcore. __________________ Got water? Water cooled for 3 years. Safe with thermal switch. Now silent with fan thermostat.