computer power supply round 2

fkuk said:

there is no green wire on my power supply
and all the wires colours match up

i seem to have it working now but i want to confirm it
i have connected grey to ground
and organge to red
now i am getting 11.98V on yellow
and i am getting 5.13V on red
voltage readings are good

but i want to know that i have done it corectly

thanks

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PWR_OK is a “power good” signal. It should be asserted high by the power supply to

indicate that the +12 VDC, +5VDC, and +3.3VDC outputs are above the under-voltage

thresholds listed in Section 3.2.1 and that sufficient mains energy is stored by the converter

to guarantee continuous power operation within specification for at least the duration

specified in Section 3.2.11, “Voltage Hold-up Time.” Conversely, PWR_OK should be deasserted

to a low state when any of the +12 VDC, +5 VDC, or +3.3 VDC output voltages

falls below its under-voltage threshold, or when mains power has been removed for a time

sufficiently long such that power supply operation cannot be guaranteed beyond the powerdown

warning time. The electrical and timing characteristics of the PWR_OK signal are

given in Table 13 and in Figure 6.

Table 13. PWR_OK Signal Characteristics

Signal Type +5 V 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 μA

High-state output impedance 1 kΩ from output to common

PWR_OK delay 100 ms < T3 < 500 ms

PWR_OK risetime T4 ≤ 10 ms

AC loss to PWR_OK hold-up time T5 ≥ 16 ms

Power-down warning T6 ≥ 1 ms

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