Specifications

3.3 Timing Requirements
These are the timing requirements for the power assembly operation. The output voltages must rise
from 10% to within regulation limits (T
vout_rise) within 5 to 70mS. The +5V, +3.3V and +12V output
voltages should start to rise at about the same time. All outputs must rise monotonically. The +5V
output needs to be greater than the +3.3V output during any point of the voltage rise. The +5V output
must never be greater than the +3.3V output by more than 2.25V. Each output voltage shall reach
regulation within 50 mS (T
vout_on) of each other during turn on of the power supply. Each output voltage
shall fall out of regulation within 400 mS (T
vout_off) of each other during turn off. Figure 1 and figure 2
show the turn On and turn Off timing
requirement. In Figure 2, the timing is shown with both AC and
PSON# controlling the On/Off of the power supply.
stinU XAM NIM noitpircseD metI
T vout_rise Output voltage rise time from each main output.(+5Vsb <
70mS)
5 70 mS
Tvout_on All main output must be within regulation of each other
within this time.
50 mS
Tvout_off All main output must leave regulation within this time 400 mS
Table 10 – Output Voltage Timing
Vout
V1
10% Vout
V2
V3
V4
T vout_on T vout_off
T v out_rise
Figure 1 : Output Voltage Timing
6