Stone HA1200 - Инструкция по эксплуатации - Страница 6

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2.3.1. PWR_OK (Power Good Signal)

PWR_OK is a “power good” signal. It will be asserted high by the power supply 
to indicate that the +5V output is above the under voltage threshold listed in 
Table 2. of Section 2.2. PWR_OK will be de-asserted to a low state when  
+5V output voltage falls below under voltage threshold, or when AC power has 
been removed for a time sufficiently such that power supply operation cannot 
work normally. The electrical and timing characteristics of the PWR_OK signal 
are given in Table 10. and in figure 1.

2.3.2. PS_ON (DC Soft Start)

PS_ON# is an active-low, TTL-compatible signal that allows a motherboard to 
remotely control the power supply in conjunction with features such as soft on/off, 
Wake on LAN*, or wake-on-modem. When PS_ON# is pulled to TTL low, 
the power supply should turn on the four main DC output rails: +12 VDC, +5 VDC, 
+3.3 VDC, and -12 VDC. When PS_ON# is pulled to TTL high or open-circuited, 
the DC output rails should not deliver current and should be held at zero 
potential with respect to ground. PS_ON# has no effect on the +5VSB output, 
which is always enabled whenever the AC power is present. Table 11 lists 
PS_ON signal characteristics.

Signal type 

+5V TTL compatible 

Logic level low 

< 0.4 V while sinking 4 mA 

Logic level high 

Between 2.4 V and 5 V output while sourcing 200 

μ

A 

High-state output impedance 

1 k

Ω

 from output to common 

      Max Ripple/Noise   

400 mV p-p 

Table 10. PWR_OK Signal Characteristics 

Parameter

Description

Value

Required

Recommended for

Alternative Sleep Mode

T0 AC 

power 

on 

time 

<2s 

T1 Power-on 

time 

< 

150ms 

T2 Rise 

time  0.2 

– 

20 

ms 

T3 

PWR_OK delay 

100 – 150 ms 

T4 

PWR_OK rise time 

< 10 ms 

T5 

AC loss to PWR_OK hold-up time 

> 12 ms 

80% load   

T6 

PWR_OK inactive to DC loss delay 

> 1 ms