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Description
•
Press and release the EVM RESET (S1) button and the on EVM temperature sensor will provide rail
#1 load temperature.
5.8
Input Current Monitoring
An onboard current monitor is provided to measure VR1 load current. MON3 can be used to monitor VR1
output current when the shunt on J28 is in the C1 position. When J26 (C1) is installed, VR1 output load
(R74) is connected causing an increase in current which can be measured by MON3 and at TP18.
•
Use TP18 (C1) to measure the current monitor output voltage.
•
Current (in amperes) = 0.5 × VC1 where VC1 is the voltage at TP18.
•
The voltage at TP18 is scaled by a factor of 2 prior to sampling at MON3.
•
Set the GUI Iout Cal Gain = 1000m
Ω
and the Iout Cal Offset = 0A.
5.8.1
Basic Process for Adding Current Monitoring to a Rail
A basic procedure to add current monitoring to rail #1, starting with the previously modified (adding
temperature) configuration will follow. Ensure that rail #1 is selected in the upper right corner.
21
SLVU347 – December 2009
Evaluation Module for UCD90120 and UCD90124
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