SilverStone SST-ZM1200M [4/12] En zm1200m manual 04
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SilverStone SST-ZM1200M [4/12] En zm1200m manual 04

SilverStone SST-ZM1200M [4/12] En zm1200m manual 04
03
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, -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.
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.
Item Description
Tvout_rise
Output voltage rise time from each main output.(+5Vsb < 70mS)
Tvout_on All main output must be within regulation of each other within this time.
MIN
570ms
ms
ms
50
400
MAX Units
Tvout_off
All main output must leave regulation within this time
Table 10 - Output Voltage Timing
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 (Tvout_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 (Tvout_on) of each other during turn on of the power supply. Each output
voltage shall fall out of regulation within 400 mS (Tvout_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 PSON# controlling the On/Off of the power supply..
Table 7 - Regulation, ripple and noise
Output Voltage +5V
Load Reg. +/-1% +/-1% +/-1% +/-1% +/-1% +/-1% +/-1% +/-1% +/-5%
Line Reg.
Ripple & Noise 50mV 50mV 50mV 50mV 50mV 50mV 50mV 120mV50mV
+3.3V +12V1 +12V2 +12V3 +12V4 +12V5 +12V6 -12V +5VSB
+/-5%
50mV
1% 1% 1% 1% 1% 1% 1% 1% 1% 1%

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