How does Motherboard VRM/PWM works - video presentation by Sin0822 - Page 3

thanks! I will have another one up hopefully later tonight on IR3550.

Hmmm. Don't take me wrong, I have contacted ASRock because I wanted to know if they are "Liars",
and as far as I know - they are right - PWM on Z77 ASRock MBO's is DIGITAL.

http://www.intersil.com/content/intersil/en/products/power-management/computing-power-vrm-imvp/multiphase-controllers/ISL6367.html

hybrid digital isn't digital. I am sorry. You need a PID processing core, as well as your signals being digital inside the PWm in the error feedback loop.

ASRock is lieing, they actually had intersil write hybrid digital=basically is analog.

Intersil does make Digital PWMs, under the name Ziker Labs.
http://www.intersil.com/en/products/power-management/zilker-labs-digital-power.html

However that isn't what this is, and no one uses those Ziker lab PWMs.

ASRock is a liar, and Intersil wont release a datasheet on ISl6367 because it is a copy of ISL6366.

Why don't you educate yourself from some other articles:

http://www-03.ibm.com/procurement/proweb.nsf/objectdocswebview/file8+-+bob+white+digital+control+concepts+presentation/$file/8+-+bob+white+digital+control+concepts+presentation+20060829.pdf

ISL6367 uses all analog PWm components as seen as traditional analog in the IBM thing above, however it has a digital PWm generator which allows them to do transient schemes like turn off all phases and align them.

Then read this:
http://www.radio-electronics.com/articles/power-management/digital-control-for-power-converters-redefines-24

Then read this:
http://electronicdesign.com/article/embedded/digital-versus-analog-power-control-a-fight-to-the

Then look at the ISl6366 datasheet below. I am sorry but I am correct, ASRock is lieing, no matter what they say.

http://pdf1.alldatasheet.com/datasheet-pdf/view/398938/INTERSIL/ISL6366.html

it can be called hybrid digital sure, i am okay with that, but it isn't digital, it isn't as accurate as digital either.

Analog PWms can use PMBus as well, ISL6367 is a analog PWM by definition, lol there is no PID, no ADC for voltage or current, there is no digital pulse width modulator, no NVM, no PID algorithm, no internal processor.

They just updated some specs and added PMBus through an DAC like they do SVID, and then they

ASROCK is lieing. You notice the trend in those articles is the way the error is processed, right? And the fact that digital PWms have some sort on on-board memory, which Intersil explicitly states it doesn't have.

I have 0 issue with MSI because they say hybrid, but that doesn't make them digital.

ASRock's definition of digital is their same definition of a de-humidifier, which I will let you find out what that means lol.

Thank you for sharing that though, great that is what they are basing digital on, i will blast them even harder. Stupid asrock idiots, i feel bad for intersil because until now they were quiet and truthful, now asrock is turning them into liars.

ISL6366 is hybrid digital IMO, as is ISL6367, but it is by no means digital. Just some parts of it qualify it has part digital, but still the MOST important parts are missing. PID, NVM, and ADC for current sensing and voltage sensing in particular.

IMO why don't you ask ASUS what they think? Or perhaps ask Intersil if they feel their hybrid-digital shodul be marketed as fully digital?
Edited by Sin0822 - 8/9/12 at 5:14pm

I see it as this: if You program it digital - it works digital.

For comparing to this.

If You have an hybrid TV tuner in Your PC, and You use it only for digital signal, You cant say "It is not digital" because it is.
OK, Its hybrid, it has booth of the worlds, so it don't make that product worse, it can just be better.

No dude you do not understand. lol first of all all PWMs are programmed, usually at the factory, however Digital PWMs have NVM(non volatile memory) so that they can be reprogrammed if needed by the manufacturer. That is how GIGABYTE was able to solve the issue with the X79-UD3, that is not possible with these intersil PWMs(Inclusing ISL6367).

Please man either goto college and become an EE like I am doing, or just believe marketing from a company who lies. Also what about the ASRock Pro3?
http://www.asrock.com/mb/Intel/Z77%20Pro3/

It says Digi Power, OH BTW IT USES AN STMicro PWM!!!! LOL that can never be considered digital, please email ASRock about that!

Also PMBus is a power management bus, it is required for CPUs with high TDPs(130W+), google on that chinese wite, wakibui or whatever it is called, VRD12 and it will be listed. It is REQUIRED for Ivy Bridge-E(130W+) and thus that is why it has to be added for VRD12.5.

PMBus has been around for a very long time, it doesn't mean anything.

Also let me put it this way, beucase you clearly do not understand analog and digital differences, digital refers to 1s and 0s, basically binary code, inside a digital PWM you have a processor which uses a PID algorithm to determine load transients, you don't see any PID in any Intersil PWM used. or any type of processing just straight error comparison and then a saw-tooth waveform is used, and that can be altered by different external busses to compare against. That isn't the same as a real processor with memory which can be programmed through a BIOS updated and which can automatically think for itself.

Also look at your Z77 ASRock boards, do you see any of the options for PWm control you see in modern ASUS and GIGABYTe boards? i am talking about a full page worth of OVP, OCP, OTP(this one is key), phase speed control, phase temperature ver current modes, and complex LLC? How about switching frequency in fine increments like 50khz?

ASRock is lieing, they are not based in the USA, and thus don't give a damn about US regulations. So they can lie through their front teeth, like asrock thinks they make it so that their boards turn on for 1 minute every hour that it can be considered a dehumidifier tech. LOL

Intersil ISL6366 and ISL6367 can both be considered hybrid digital PWMs.

The huge difference between analog and digital is the fact that the error loop is able to give the PWm the information to figure out how long to keep each phase on as well as the duty cycle and other characteristics so that it can go and turn on stuff for that period of time.

An analog PWM will increase and decrease the duty cycle once the error goes out of the range it wishes, however a digital PWM will figure out exactly how long to move the duty cycle so that it wont overshoot or undershoot and so that it can be more precise. Also voltage setting was more accurate but Intersil was finally able to get ISl6366 down to 5mv as that is VRD12 standard.

Intersil ISl6367 is just another analog PWM which has been pushed far and been given the ability to use the digital buses which the new VRD specs require. Just like ISl6366 was. There becomes a point where they can just switch.

If what you say is true, then why doesn't Intersil call their PWm a digital PWM? Because it isn't digital man.

I am sorry man, i don't mean to offend you but ASRock lies a lot. I feel like actually filing a class action lawsuit. Can I ask how do you think they controlled their PWms in the past? They have always used DVID or SVID, and those two are digital busses. You can see they are converted to analog by a DAC as soon as they enter the PWm as well. Same for PMBus i bet you and that is why Intersil wont share a block diagram let alone a datasheet.
Edited by Sin0822 - 8/9/12 at 7:13pm

here man IR3550 versus other MOSFETs
http://www.youtube.com/watch?v=6Fl1iFtOLKU&feature=youtu.be

yea man I will have more coming soon as well. On different things such as analog versus digital in real terms, not PMBus lol. I mean seriously ASRock just carried over their Digi marketing from their X79 and Z68 boards, which doesn't apply to these boards. Also some of their X79 boards, like X79 fatality champion and X79 Extreme11 are also using the analog PWM.

Now while it doesn't make so much difference to a lot of you, to me i hate when manufacturers lie and no one calls them out on it.