Reliability
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10 Reliability
10.1 Reliability (Recommended)
The de-rating process promotes quality and high reliability. All electronic components
should be designed with conservative device de-ratings for use in commercial and
industrial environments.
Electrolytic capacitor and fan lifetime and reliability should be considered in the design
as well.
10.2 Reliability – PS_ON# Toggle for S0ix Mode
(Required)
Computer can periodically wake from S0ix depending on operation system, installed
software, user interaction and other design implementation. Such wakes can have
impact not only to the PSU reliability, but also be a source of end user annoyance with
PSU fan spinning on then off again.
In order to optimize desktop platform power consumption, Intel provides design
recommendation to enable power supply PS_ON# toggle on/off during S0 idle power
mode (S0ix) to save both system and PSU power. The power supply PS_ON# signal
may toggle on/off every 180s (PSU to be on for up to 1s and off for 180s) when
customer desktop designs implement S0 idle which is different from the legacy
desktop platform design that PS_ON# only toggles once when turned on. The S0ix
mode is used in systems that use Alternative Low Power Modes. This on / off toggling
comes from scheduled OS maintenance tasks that occur in the background that
necessitate bringing the PC on in order to execute CPU instructions.
Although the periodicity for on/off toggling is non-deterministic, it can happen
regularly after the system has entered the S0ix idle mode with PS_ON# de-
asserted. If the computer turns on/off every 180 seconds, the worst-case scenario
would be 480 times in one day and 175,200 times in one year. The power supply
needs to be able to handle this many cycles for the life of the power supply.
To have a better user experience, and avoid PSU fan acoustic noise annoyance,
system and PSU designers should have at least two seconds delay time for the PSU
fan to spin up after PS_ON# assertion. PSU is expected to support running at full load
without any electrical, thermal components (i.e., IC, MOSFET, diode, transformer,
inductor, capacitor, relay, fan, etc.) damaged or degradations during the period of
time before the warranty expired. Due to the frequent PS_ON# toggle on/off, system
and PSU component’s reliability should be considered based on the days, months, or
years of claimed warranty listed on product specification. This is also mentioned in
Section 5.4.2
.
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