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post #701 of 1336
Quote:
Originally Posted by Patch View Post
That's actually my question. I don't know because I don't have any frame of reference for this parameter.

Is a bump from 200 to 202 kHz significant, or do you need to go up to 300 kHz? Then I can pick a resistor size.

Thanks for the ground answer.
Sorry Man I wish I had a definitive answer for you on the switching frequency but I have never chartered that territory before. Anything I would say would just be speculation on my part as of now but I will see if I can find some info about it

EDIT:What is the IC in particular that we are dealing with here?
Edited by Voltage_Drop - 1/9/10 at 11:13am
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post #702 of 1336
As I understand it, as you increase voltage, the capacitance lowers and the freq increases. The additional caps you added should help keep the freq down. I'm thinking you will want to shoot closer to 300K to give yourself enough 'headroom'. Just a slightly educated guess from what I've seen in other data sheets. Can you post a link to the data sheet your using Patch?
    
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post #703 of 1336
Thanks guys, here's the data sheet.

I think I'll put on a 100K VR. That would increase the frequency from 200 to 203, and I can dial it down to 25-30K to get a frequency of 300. Seems like a good range.
Edited by Patch - 1/9/10 at 11:56am
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post #704 of 1336
Attached is a graph showing the resistance value vs the Oscillator freq. This should help you figure out what freq limitation you are changing with said resistances. 300kHz might not even be enough, but your VR should work well.
    
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post #705 of 1336
Thread Starter 
you guys are talking about some real deep stuff, I'm not even going to pretend I understand.. Instead i'll get back to volt modding my new project:

tri-sli watercooled 8800GTX's with full vmem, vgpu and OCP along with vmeasure all on switches.



I'm in this one for the llong haul and it wont be done for a few days because of hose clamps I ordered and a lack of TIM (also on the way). unfortunately one of the full cover waterblocks is going to waste because I just can't get to correct spacing of the cards in the bloodrage my 3-way sli bridge isn't going to do any good either so I have to try w/o a bridge or just link both cards to the primary

did that block end up arriving patch? I have yet to check the tracking

that new
Edited by tha d0ctor - 1/9/10 at 1:55pm
post #706 of 1336
Quote:
Originally Posted by Patch View Post
Thanks guys, here's the data sheet.

I think I'll put on a 100K VR. That would increase the frequency from 200 to 203, and I can dial it down to 25-30K to get a frequency of 300 [OSC is rated at max of 250khz..circuitry is rated for max of 800khz..]. Seems like a good range.

For the switching freq mod..you will want to try to nail your OSC at 250-300khz..this will increase the dynamic response of the Pulse..

*In short, the OSC is the 'high-hat' ...everything in the mosfet circuit keeps time with it...raising the OSC freq will in effect, raise the response time for the entire PMW circuit...this should minimize vdroop and increase stability of the power..'buffering' out some of the micro-stutters or spikes in the supply chain.

Pin#1 is SS or OSC..connect this to VR -> ground and lower resistance to raise switching freq.
post #707 of 1336
Quote:
Originally Posted by CL3P20 View Post
For the switching freq mod..you will want to try to nail your OSC at 250-300khz..this will increase the dynamic response of the Pulse..

*In short, the OSC is the 'high-hat' ...everything in the mosfet circuit keeps time with it...raising the OSC freq will in effect, raise the response time for the entire PMW circuit...this should minimize vdroop and increase stability of the power..'buffering' out some of the micro-stutters or spikes in the supply chain.

Pin#1 is SS or OSC..connect this to VR -> ground and lower resistance to raise switching freq.
Hmm....now I'm confused. Should I be putting a VR on the RT pin or the SS pin? Or one on each?

Heck, I could do both and put em on switches to flip back and forth for comparison.......too bad I don't have any way to directly measure the frequency.

@Doc: I don't have the foggiest idea what all this means, either. I'm just always up for soldering stuff trying for more speed. These are the perfect cards for tinkering. They really suck at stock and overclock like dogs. And they cost me $30 for the pair on ebay. I considered just randomly slapping another capacitor on every reachable cap on the card......except I don't really know the polarity on most...
Edited by Patch - 1/9/10 at 6:04pm
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post #708 of 1336
I meant it right..just said it wrong ..rofl

Pin1 is what you should be using for switching freq mod..it is indeed RT

*I havent bothered with switching mod since the 7900 series..helped break a lot of misconceptions about the capability of the cores speed potential though. Most folks will tell you core cap for 7900gt is ~730-750mhz...switching mod made 800+ a reality.
post #709 of 1336
Quote:
Originally Posted by Patch View Post
Hmm....now I'm confused. Should I be putting a VR on the RT pin or the SS pin? Or one on each?

Heck, I could do both and put em on switches to flip back and forth for comparison.......too bad I don't have any way to directly measure the frequency.

@Doc: I don't have the foggiest idea what all this means, either. I'm just always up for soldering stuff trying for more speed. These are the perfect cards for tinkering. They really suck at stock and overclock like dogs. And they cost me $30 for the pair on ebay. I considered just randomly slapping another capacitor on every reachable cap on the card......except I don't really know the polarity on most...
The RT and SS look as if they are in parallel with each other from the typical app. from the data sheet. I would put the resistor off of the RT pin cause it looks like there should be capacitance which comes out of the SS which is in parallel with RT. The max frequency(as specified from the data sheet is 230kHz which is +20%. Is there a resistor already coming out of RT already? The reason I ask this is because Its Oscillating frequency is 200kHz already with RT open. There should not be a need to measure the frequency directly because we already have the formula and we know that 200kHz is what comes out of the chip with no resistance to manipulate it. You would want to reach a little under 100 ohms (series or parallel to nail 230kHz). Though if you really wanted to measure the frequency then that would be done with an Oscilloscope. Though if CL3P20 states that the max of 230kHz can be broken then I would be inclined to follow his guidance as he is the VMod Master!
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post #710 of 1336
*SS is 'soft start' which has an input cap and resistor attached to it...it provide a "ramping" effect in start-up voltage, once the input cap is charged.

..the 'Rrt vs. Osc freq graph' [pg6] indicates the the frequencies that the circuit is capable of dealing with...I think its funny they start with their listed "max" of the Osc' capable freq..230khz. I think its safe to say, the Osc is capable of more than what they are quoting here..but I would be hesitant to push too much past 300khz right away.
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