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Ask away! Your questions on current VRM(Voltage regulator module) Technology

post #1 of 30
Thread Starter 
Hey guys, I want your question on what you want to know about motherboard voltage regulator modules, mainly the CPU's voltage regulator circuit, the phases and all. Ask away!

Some questions like examples are:
What is switching frequency?
What is a PWM?
Whats the difference between analog and digital?
What is a DrMOS?
What is vdroop and vdrop for?

Ask away, because I will answer your questions, and this will be helpful to me in putting together my reviews. There will be no Bias no the answers, as in i might use examples, but facts only.
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post #2 of 30
I'll bite. What is a DrMOS? First time I've ever heard of it.
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post #3 of 30
Thread Starter 
DrMOS stands for Driver MOSFET. The MOSFET changes 12v from your PSu into 1.2v and then increase amperage proportionally(semi-proportional energy lost in heat also). Now the VRm is made up of a bunch of MOSFETs(2 MOSFETs per phase) and drivers and a PWM, not to mention inductors and capacitors.DrMOS allows the integration of the driver and the two MOSFETs into a single integrated circuit, allowing the VRM to become smaller and more efficient. in the end you have a smaller board footprint and a cooler running VRM.
Edited by Sin0822 - 4/11/11 at 8:44am
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post #4 of 30
What is the difference between analog and digital?
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post #5 of 30
Thread Starter 
well both are mix signal PWMs, but they are really different in the way that they control voltage output.

Voltage error correction is how a PWM controls the output voltage, the output voltage is compared to the voltage that it should be, and the a signal is sent to the drivers to either turn on or off the MOSFETs(or phase).

Analogue does this by comparing a measured voltage to a set votlage and powering MOSFETs to induce a votlage change.
Digital employees a method an algorithm calculates exactly how long to leave the MOSFET on or off. it is less guessing in that respect, but its slower because it uses an analogue to digital controller to interpret the output voltage.

Current sensing in both are relatively the same, and the inner works are mostly the same.
There are other differences as well, but they are very minor, the voltage error compensation mechanism for voltage and current really makes them different, but they end up working the same.

Digital also can be controlled by software, and LLC is integrated rather than off die.
Edited by Sin0822 - 4/11/11 at 8:45am
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post #6 of 30
Interesting thread... perhaps I'll learn a few things also probably merge some of this info into my article back in the AMD section
post #7 of 30
Nice thread Sin!

How about an explanation for others on how the new onboard PWM switches will help once the new OC board is available to the masses.
    
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post #8 of 30
how can a newb like me tell if thats possible lol
EDIT: not trolling if it seems like it. cool idea and nice of you to help out btw
Edited by Th0m0_202 - 4/10/11 at 11:09pm
post #9 of 30
Thread Starter 
Quote:
Originally Posted by xd_1771 View Post
Interesting thread... perhaps I'll learn a few things also probably merge some of this info into my article back in the AMD section
Well i was going to write a very large article encompassing everything. From duty cycle to transient responce, to different types of capcitors, to even how to do a vdroop mod. From electrical storage to everything. I am already in the process of already writing the whole article, its going to be pretty long. With examples of how things have changed. Like to different type of MOSFETs, to phase doublers. If you don't mind i wanted to use a lot of what I am saying in my reviews. If you want to link to my final thread that would be fine.
Quote:
Originally Posted by lsdmeasap View Post
Nice thread Sin!

How about an explanation for others on how the new onboard PWM switches will help once the new OC board is available to the masses.
hahai can show them how it works, I will becuase it controls teh switching frequency. I have seena lot about their new VRM for the OC board, and I am basiaclly writing all this as a pretense to that review, since i have written a lot of it. I was most shocked to learn that they custom ordered almost every part. The PWM is the same of course. lol.

Anyways they will have option for switching frequency of 400khz stock, 600khz switch 1, 800khz #2, and 1mhz #3.
Edited by Sin0822 - 4/11/11 at 8:46am
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post #10 of 30
What is vdroop and vdrop for?

How are they measured?
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