Electrical
38 613768
Figure 4-4: +12VSB Power on Timing versus VAC
4.3.4 Power-On Time (Required)
The power-on time is defined as the time from when PS_ON# is pulled low to when
the +12 VDC output is within the regulation ranges specified in Table 4-2
. The power-
on time shall be less than 150 ms (T1 < 150 ms).
+12VSB shall have a power-on time of two second maximum after application of valid
AC voltages as shown in the above figure. The 12VSB power on time is T0 as listed in
Section 4.3.3.
4.3.5 Rise Time (Required)
The output voltages shall rise from 10% of nominal to within the regulation ranges
specified in Table 4-2
within 0.2 ms to 20 ms (0.2 ms ≤ T2 ≤ 20 ms). The total time
for Rise time of each voltage is listed in Table 4-8: Power Supply Timing as T2.
There must be a smooth and continuous ramp of each DC output voltage from 10% to
95% of its final set point within the regulation band, while loaded as specified.
The smooth turn-on requires that, during the 10% to 95% portion of the rise time, the
slope of the turn-on waveform must be positive and have a value of between 0 V/ms
and [Vout, nominal / 0.2] V/ms. Also, for any 5 ms segment of the 10% to 95% rise
time waveform, a straight line drawn between the endpoints of the waveform segment
must have a slope ≥ [Vout, nominal / 20] V/ms.
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