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SSI

EPS1U Power Supply Design Guide, V1.1

6.9 Timing Requirements

STATUS

Required

These are the timing requirements for the power supply operation. The output voltages must rise from 10% to

within regulation limits (T

vout_rise

) within 5 to 70 ms. The +3.3 V, +5 V and +12 V output voltages should start to

rise at about the same time. All outputs must rise monotonically. The +5 V output needs to be greater than the

+3.3 V output during any point of the voltage rise. The +5 V output must never be greater than the +3.3V output

by more than 2.25 V. 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 4 and Figure 5 show the turn ON and turn OFF timing requirements. In Figure 5 the timing

is shown with both AC and PSON# controlling the ON/OFF of the power supply.

Table 15: Output Voltage Timing

Item Description MIN MAX Units

vout_rise

Output voltage rise time from each main output. 5 70 ms

vout_on

All main outputs must be within regulation of each

other within this time.

50 ms

vout_off

All main outputs must leave regulation within this

time.

400 ms

Figure 4: Output Voltage Timing

Vout

10%

Vout

vout_rise

vout_on

vout_off

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 30 31

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