Test Procedure
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4.
Select the Monitor Page and the window in
Figure 7
will be displayed. The operating status of the
output voltage and other parameters for Rail #1 can be reviewed from this window, by default Rail #1
is always presented at the Fusion GUI startup. Rail #2 can be monitored by using the dropdown
selection in the upper right corner of the monitoring window and selecting UCD9224 @ Address xxx
Rail #2. The red horizontal lines that are present in most of the plots indicate the fault limits for this
parameter and the yellow lines are the warning levels.
In the V
OUT
Rail #1 plot shown in
Figure 7
, the voltage can be seen to shift down slightly and then up
slightly when referenced to the earlier section of the plot. This reflects the application of margining to
the output voltage with the Margin High setting still visible at the bottom of the column just to the left of
the plots.
Figure 7. Fusion Digital Power Designer Software – Monitor Page – Rail #1
NOTE:
A Low V
IN
alert may be present when monitoring is first accessed but it does not affect the
operation of the system. This is a typical alert condition during initial voltage application, as
V
IN
ramps above the voltage necessary to power the UCD9224 but has not reached the Turn
Controller On threshold before the first V
IN
sample is taken by the controller. This contrasts to
a V
IN
Under Voltage Warning which occurs when the unit is operating and the input voltage
falls below the V
IN
UV Warning level.
16
UCD9224EVM-464 Digitally Controlled Dual-Rail POL
SLUU443 – March 2011
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