4
3. DC Output Specification
3.1 Output Current / Loading
The following table defines power and current rating. The power supply shall meet both static and
dynamic voltage regulation requirements for minimum load condition.
Output
Voltage
+5V +3.3V +12V -5V -12V +5VSB
Min. Load 1A 1A 2A 0A 0A 0.1A
Max. Combined
440W
Total Output
Table 2– Output Loads Range 1:
Note 1: Maximum continuous total DC output power should not exceed 1800 W.
3.2 DC Voltage Regulation, Ripple and Noise
The power supply output voltages must stay within the following voltage limits when operating at
steady state and dynamic loading conditions. All outputs are measured with reference to the return
remote sense (ReturnS) signal. The +5V,+3.3V, +12V, -5V,-12V and +5VSB outputs are measure at
the power supply connectors references to ReturnS. The +5V and +3.3V is measured at its remote
sense signal (+5VS, +3.3VS) located at the signal connector.
Output Voltage +5V +3.3V +12V -5V -12V +5VSB
Load Reg. +/-5% +/-5% +/-5% +/-10% +/-5% +/-5%
Line Reg. ±1% ±1% ±1%
±1%
±1% ±1%
Ripple & Noise 50mV 50mV 120mV 100mV 120mV 50mV
Table 3 – Regulation, ripple and noise
Ripple and Noise shall be measured using the following methods:
a) Measurements made differentially to eliminate common-mode noise
b) Ground lead length of oscilloscope probe shall be 0.25 inch.
c) Measurements made where the cable connectors attach to the load.
d) Outputs bypassed at the point of measurement with a parallel combination of
10uF tantalum capacitor in parallel with a 0.1uF ceramic capacitors.
e) Oscilloscope bandwidth of 0 Hz to 20MHz.
f) Measurements measured at locations where remote sense wires are connected.
g) Regulation tolerance shall include temperature change, warm up drift and dynamic load
3.3 Timing Requirements
These are the timing requirements for the power assembly operation. The output voltages must rise
from 10% to within regulation limits (T
vout_rise) within 5 to 70mS. The +5V, +3.3V and +12V output
voltages should start to rise at about the same time. All outputs must rise monotonically. The +5V
output needs to be greater than the +3.3V output during any point of the voltage rise. The +5V output
must never be greater than the +3.3V output by more than 2.25V. Each output voltage shall reach
regulation within 50 mS (T
vout_on) of each other during turn on of the power supply. Each output voltage
shall fall out of regulation within 400 mS (T
vout_off) of each other during turn off. Figure 1 and figure 2
show the turn On and turn Off timing requirement. In Figure 2, the timing is shown with both AC
and
Max. Load
60A 60A 140A
0.5A
0.8A
3A
1775W
2.5W 9.6W 15W
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