Intel TFX12V manual 2.3.3 +5 VSB, Power-on Time, PSON# Signal Characteristics, Parameter, Minimum

Table 14. PS_ON# Signal Characteristics

Parameter

VIL, Input Low Voltage

IIL, Input Low Current (Vin = 0.4 V)

VIH, Input High Voltage (Iin = -200 µA)

VIH open circuit, Iin = 0

TFX12V Power Supply Design Guide

Thin Form Factor with 12-V Connector

Version 2.0

Minimum	Maximum
0.0 V	0.8 V

-1.6 mA

2.0 V

5.25 V

Disable

≤ 0.8 V

PS is

enabled

Enable

Hysteresis ≥ 0.3 V

≥ 2.0 V

PS is

disabled

0.82.0

5.25= Maximum Open- Circuit Voltage

PS_ON# Voltage

Figure 8. PS_ON# Signal Characteristics

2.3.3+5 VSB

+5 VSB is a standby supply output that is active whenever the AC power is present. This output provides a power source for circuits that must remain operational when the five main DC output rails are in a disabled state. Example uses include soft power control, Wake on LAN, wake-on-modem, intrusion detection, or suspend state activities.

The +5 VSB output should be capable of delivering a minimum of 2.0 A. at +5 V ± 5% to external circuits. The power supply must be able to provide the required power during a "wake up" event. If an external USB device generates the event, there may be peak currents as high as 2.5 A., lasting no more than 500 ms.

Over current protection is required on the +5 VSB output regardless of the output current rating. This ensures the power supply will not be damaged if external circuits draw more current than the supply can provide.

2.3.4Power-on Time

The power-on time is defined as the time from when PS_ON# is pulled low to when the +12 VDC, +5 VDC, and +3.3 VDC outputs are within the regulation ranges specified in Section 2.2.1. The power-on time shall be less than 500 ms (T1 < 500 ms).

+5 VSB shall have a power-on time of two seconds maximum after application of valid AC voltages.