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Need some vdroop assistance (L6740L) - Page 2

post #11 of 31
1/5/11 at 11:07pm
Any progress yet?. I finaly got back home so im gonna dive into this also. Probably tonight
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post #12 of 31
1/6/11 at 6:17am
Thread Starter 
Not yet. I've been working on some other things. Still plan on it though.
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post #13 of 31
1/6/11 at 8:26am
Hi. Shouldn't just lowering the resistance between VDROOP and VSEN(Rfb) do the job?

According to the datasheet this resistor determines the voltage droop:

Vcore = VID - Idroop * Rfb
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post #14 of 31
1/6/11 at 8:51am
Thread Starter 
Quote:
Originally Posted by mAlkAv!An View Post
Hi. Shouldn't just lowering the resistance between VDROOP and VSEN(Rfb) do the job?

According to the datasheet this resistor determines the voltage droop:

Vcore = VID - Idroop * Rfb
This makes sense!! I will try it for sure
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post #15 of 31
1/10/11 at 10:49am
Thread Starter 
Offset pin didn't seem to do anything.

Can't seem to find a connecting resistor between vdroop and vsen.
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post #16 of 31
1/10/11 at 11:37am
Quote:
Originally Posted by PizzaMan View Post
Can't seem to find a connecting resistor between vdroop and vsen.
Pizza, take a look at this mod guide, it uses a similiar IC(L6714) and might help you too:
http://forums.vr-zone.com/the-overcl...ml#post4334225

Btw, do you have any pics of the IC area?
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post #17 of 31
1/10/11 at 4:31pm
Thread Starter 
Yea, looks like mine will be something similar.



Best pic I was to take ATM.
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post #18 of 31
2/6/11 at 6:44am
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Attachment 194257

Seems like its gonna be right in this area.. check and see if pin 4 and 5 are shorted together first.
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post #19 of 31
2/6/11 at 10:42am
Thread Starter 
4 and 5 are not shorted together. There's a .985K resistance between them.


Measured and labeled the area. Think I found it a bit to the right. Ran out of room so I used a 2nd pic. Should I shade th resisitor between 4 and 5?

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post #20 of 31
2/6/11 at 5:39pm
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Yes..the datasheet says to short 4->5 to implement vdroop function..I am assuming this means to disable droop. It may not be the fix you are looking for but may help at least show us whats next for this ...
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