Intel ERP2U manual Timing Requirements, Output Voltage Timing, Description

SSI

ERP2U Power Supply Design Guide, V1.0

6.11 Timing Requirements

STATUS

Required

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 200ms. 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 +5V 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 (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 2 and Figure 3 show the turn ON and turn OFF timing requirements. In Figure 3, the timing is shown with both AC and PSON# controlling the ON/OFF of the power supply.

Table 18: Output Voltage Timing

Item		Description		MIN		MAX	Units
Tvout_rise		Output voltage rise time from each main output.		5		200	ms
Tvout_on		All main outputs must be within regulation of each				50	ms
		other within this time.
Tvout_off		All main outputs must leave regulation within this				400	ms
		time.
	Vout
	V1	10% Vout
	V2
	V3
	V4
			Tvout_rise		Tvout_off
			Tvout_on

Figure 2: Output Voltage Timing

- 21 -