03
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 must occur first 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 shows 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.
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
Table 4 – Output Voltage Timing
Item
Tvout_rise
Tvout_on
Tvout_off
Description
Output voltage rise time from each main output.(+5Vsb < 70mS)
All main output must be within regulation of each other within this time.
All main output must leave regulation within this time
MIN
5
N/A
N/A
MAX
70
50
400
Units
mS
mS
mS
Figure 1:Output Voltage Timing
Summary of Contents for Gemini GM500-G
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