DVFS

By: David Hess (davidwhess.delete@this.gmail.com), September 13, 2021 2:21 pm
Room: Moderated Discussions
--- (---.delete@this.redheron.com) on September 13, 2021 2:06 pm wrote:
>
> I'm no expert at this low-level, but I think the primary issue is voltage droop.
> Obviously an ideal power source would maintain the exact (varying) current you need at the exact
> (unvarying) voltage you request, but the reality is that as load changes, voltage will droop.
> You can either deal with this by constantly operating at a higher voltage than absolutely necessary,
> or you can slide voltage up-and-down reactively, as I suggested -- but the closer you operate to
> the edge, the faster you need to be able to cope with an unexpected additional load.

One trick they use is voltage positioning where at low current draw, the voltage is deliberately raised to handle the droop caused by a sudden increase in current, and the reverse with the voltage lowered at high current to handle the sudden increase when current decreases. This considerably relaxes the transient response requirements of the regulator.

The required voltage accuracy is 10s of millivolts.
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                    DVFS---2021/09/13 01:06 PM
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                      Quick shutdown?Andrei F2021/09/17 01:35 AM
                        Quick shutdown?Andrei F2021/09/17 01:38 AM
            and weren't 'they' right?Daniel B2021/09/13 04:20 AM
              and weren't 'they' right?Andrei F2021/09/13 04:51 AM
                and weren't 'they' right?Daniel B2021/09/13 06:29 AM
              and weren't 'they' right?anon2021/09/13 05:07 AM
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                  and weren't 'they' right?anon2021/09/13 11:37 PM
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                  Alder Lake has no little coresHeikki Kultala2021/09/13 01:49 PM
                    Alder Lake has no little coresanon2021/09/13 11:42 PM
                why stop at two core sizes?hobold2021/09/14 05:47 AM
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                      Battery vs Performance---2021/09/13 05:08 PM
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                    Battery vs PerformanceAnon2021/09/14 06:42 AM
                and weren't 'they' right?Daniel B2021/09/13 12:57 PM
                  and weren't 'they' right?David Hess2021/09/13 02:11 PM
                    and weren't 'they' right?---2021/09/13 02:38 PM
                  and weren't 'they' right?---2021/09/13 02:32 PM
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                  and weren't 'they' right?Jukka Larja2021/09/14 04:31 AM
              and weren't 'they' right?Etienne Lorrain2021/09/14 12:29 AM
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