Hold Up Time
The hold-up time indicates the length of time a power supply can maintain stable performance to the ATX specification without input power. This is very important when the quality of the power fluctuates and there are short dips in the supply (dips or brownouts). In the oscilloscope screenshots below, the blue line is the AC input line signal, the green line is the “Power Good” signal, and the yellow line is the +12V rail. The measured time variable is listed as ΔX. The hold-up time is much higher than 17 ms, and the power-ok signal is accurate.
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Timings for the alternative sleep mode (ASM)
Traditionally, sleep mode (S3) shuts down the system for a long time (minutes or hours) to reduce power consumption. However, this approach results in a delay of a few seconds when switching back on from standby mode. Microsoft recently introduced Modern Sleep, which brings the ability to turn on instantly to the PC – just as a phone, for example, turns on instantly with no noticeable delay. Modern Sleep builds on the alternate sleep mode capability that Intel has defined, but in order to support ASM, a power supply must be able to wake up quickly from sleep mode to ensure system stability, which is a type of power supply boot time.
Parameter | Description | Recommended Value |
---|---|---|
T0 | AC power-on time | < 2s |
T1 | Power-on time | < 150 ms |
T2 | Rise time | 0.2-20 ms |
T3 | PWR_OK delay | 100-150 ms |
T4 | PWR_OK rise time | < 10 ms |
T5 | AC loss to PWR_OK hold-up time | > 16 ms |
T6 | PWR_OK inactive to DC loss delay | > 1 ms |
We have now measured T1 and T3 at 20% and 100% load for this power supply (T1 (Power-on time) & T3 (PWR_OK delay)):
Load | T1 | T3 |
20% | 53 ms | 135 ms |
---|---|---|
100% | 53 ms | 135 ms |
The turn-on time is less than 100 ms and the PWR_OK delay is less than 150 ms. This power supply supports the alternative sleep mode.
- 1 - Unboxing, Vorstellung und technische Daten
- 2 - Anschluss-Kabel und Kabel-Management
- 3 - Innerer Aufbau und Komponenten
- 4 - Spannungsregulation und Restwelligkeit (Ripple)
- 5 - Effizienz
- 6 - Geräuschemission und Lüfterdrehzahlen
- 7 - Crossload im Detail
- 8 - Timing Tests
- 9 - Erweiterte Transienten-Tests
- 10 - Schutzfunktionen, Power Sequencing, EMV
- 11 - Zusammenfassung und Fazit
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