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Needs GA-G33M-DS2R VDroop mod (ISL6327) Needs GA-G33M-DS2R VDroop mod (ISL6327)
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Needs GA-G33M-DS2R VDroop mod (ISL6327)
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Old 23rd July 2007, 13:08   #11
fishton
 
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Yes

it s the 2.6k resistor that I ve measured between Vdiff and IDroop (so point 5 and 9 yes)

If I pencil this resistor, Rfb will be null right ? so Vdroop = Iavg x Rfb with Rfcb -> 0 will be null .?

Last edited by fishton : 23rd July 2007 at 13:11.
 
Old 24th July 2007, 12:04   #12
fishton
 
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Quote:
Originally Posted by fishton View Post
Yes

it s the 2.6k resistor that I ve measured between Vdiff and IDroop (so point 5 and 9 yes)

If I pencil this resistor, Rfb will be null right ? so Vdroop = Iavg x Rfb with Rfcb -> 0 will be null .?
Do you have an idea ?
 
Old 24th July 2007, 14:35   #13
fishton
 
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More information for you Massman.

From my measures, I ve identified the layout scheme used with the ISL6327




As you can see, the scheme seems to be the same as datasheet one for Regulation with Loadline. The scheme have much more sense for me and for you ?

What do you think about RFB (pin 5 to 9) ? Can I use pencil to reduct its value in order to reduc VDroop ?

Last edited by fishton : 24th July 2007 at 14:54.
 
Old 24th July 2007, 16:10   #14
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pin 5 to 9 was my first thought too. If it was my board, I would give it a shot, but be VERY careful!!!
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Old 24th July 2007, 16:18   #15
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Then the mod should look like this, right?

Last edited by Massman : 24th July 2007 at 17:17.
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Old 24th July 2007, 16:22   #16
fishton
 
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pin 5 to 9 was my first thought too. If it was my board, I would give it a shot, but be VERY careful!!!
How can I be very careful ? test with a very small line of pencil, measure new resistance, test and start again with a bigger line ?
 
Old 24th July 2007, 16:24   #17
fishton
 
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For me the VDroop mod is here :



but i m not sure

For the VDrop mod, i' dont know what i must do for it
 
Old 24th July 2007, 16:26   #18
fishton
 
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On your scheme, yellow dots are already connected, I think you make a mistake in your drawing.

For the Vcore, 1 is not connected to Ground i think (I ll verify tonigh), it s connected to COMP
 
Old 24th July 2007, 16:28   #19
fishton
 
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I forgot smthing :


THX FOR YOUR HELP
 
Old 24th July 2007, 17:16   #20
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Quote:
Originally Posted by fishton View Post
On your scheme, yellow dots are already connected, I think you make a mistake in your drawing.

For the Vcore, 1 is not connected to Ground i think (I ll verify tonigh), it s connected to COMP
My drawing is indeed wrong, sorry, yours is good
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