SilverStone ST46F [5/12] St46gf

ST46GF

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 (Tvout_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 (Tvout_on) of each other during turn on of the power supply.

Each output voltage shall fall out of regulation within 400 mS (Tvout_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.

Table 4 – Output Voltage Timing

Figure 1 : Output Voltage Timing

Item

Tvout_rise

Tvout_on

Tvout_off

Description

Output voltage rise time from each main output.(+5Vsb < 70mS)

All main output must be within regulation of each other within this time.

All main output must leave regulation within this time

MIN

MAX

400

Units