ATX12VO (12V Only) Desktop Power Supply
Design Guide
Timing, Housekeeping, and Control (Required)
Figure 4-2: Power on Timing
Table 4-8: Power Supply Timing
Parameter | Description | Value | |
Required | Recommended | ||
T0 | AC power on time4 | <2s | |
T1 | Power-on time3 | <150ms1 | <100 ms |
T2 | Rise time | 0.2–20 ms | |
T3 | PWR_OK delay3 | 1ms – 150ms1 | 1–100 ms |
T4 | PWR_OK rise time | < 10 ms | |
T5 | AC loss to PWR_OK hold-up time3 | > 16 ms2 | |
T6 | PWR_OK inactive to DC loss delay | > 1 ms | |
- T1 and T3 required values are set to meet timing requirement for computers that use ALPM.
- T5 to be defined for both max/min load condition.
- PSUs are recommended to label or indicate the timing value for system designer and integrator reference for T1 and T3. This allows system designers to optimize “turn on” time within the system.
- T0 is shown in Section 4.3.3, Figure 4-4.