PassMark PM123 - DC Voltage Regulation Standards; Output Ripple and Noise Requirements; PSU Timing Parameters Overview

Inline PSU Tester – User’s Guide Page 8
Figure 4: 15-pin SATA connector
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Signal
+3.3 V
Ground
+5 V
Ground
+12 V
Table 5: 15-pin SATA connector pinout
DC Regulation range
The DC output voltages shall remain within the regulation ranges shown in Table 1.
PSU Output line
Range
Min.
Nom.
Max.
Unit
+12V1DC
±5%
+11.40
+12.00
+12.60
Volts
+12V2DC (12V CPU)
±5%
+11.40
+12.00
+12.60
Volts
+5V
±5%
+4.75
+5.00
+5.25
Volts
+3.3VDC
±5%
+3.14
+3.30
+3.47
Volts
-12VDC
±10%
-10.80
-12.00
-13.20
Volts
+5VSB
±5%
+4.75
+5.00
+5.25
Volts
Table 6
Output Ripple/Noise
The output ripple/noise requirements listed in Table 2.
Output
Max. Ripple & Noise (mVpp)
+12V1DC
120
+12V2DC (12V CPU)
120
+5VDC
50
+3.3VDC
50
-12VDC
120
+5VSB
50
Table 7
mVpp = Millivolts peak to peak
Timings
Below you can see the timing diagram for the power good signal as available on the
ATX12V specification. “VAC” is the input alternating voltage, i.e., the voltage from
the wall. PS_ON# is the “power on” signal (i.e., you pushed the “standby” button
from the computer case). “O/P’s” stand for “operating points.” And PWR_OK is the
power good signal.