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8
Test Procedure
8.1
Efficiency Measurement Procedure
Danger
measurement!
Do not leave the EVM powered when unattended.
Danger of heat burn from high temperature.
1. See
Figure 4
for basic setup to measure power-conversion efficiency. The required equipment for this
measurement is listed in
2. Check the boards visually before making electrical connections to ensure that no shipping damage
occurred.
3. Use the UCD3138PSFBEVM-027 and UCD3138CC64EVM-030 for this measurement which are
included this EVM package along with the USB-TO-GPIO.
4. Install the UCD3138CC64EVM-030 board onto the UCD3138PSFBEVM-027 first. Take care with the
alignment and orientation of the two boards to avoid damage.
•
See
Figure 6
5. Connect the DC-voltage source to J1 (+) and J11 (–). The DC-voltage source should be isolated and
meet IEC61010 requirements.
•
Set up the DC-output voltage in the range specified in
set the DC-source current limit at 1.2 A.
NOTE: A fuse is not installed on the board and, therefore, the board relies on the current limit of the
external voltage source for circuit protection.
6. Connect an electronic load with either a constant-current mode or constant-resistance mode. The load
range is from 0 to 30 A.
7. Ensure a jumper is installed on J6 of the UCD3138CC64EVM-030
8. Use the switch S1 to turn on the board output after the input voltage is applied to the board. Before
applying input voltage, ensure that the switch, S1, is in the OFF position.
9. Use a current meter or low-ohmic shunt and DMM between the load and the board for current
measurements if the load does not have a current or a power display.
10. Connect a volt-meter across the output connector and set the volt-meter scale at 0 to 15 V (DC).
11. Turn on the DC-voltage source output. Flip S1 to ON and vary the load.
12. Record output voltage and current measurements.
8.2
Equipment Shutdown Procedure
1. Shut down the DC-voltage source
2. Shut down the electronic load.
SLUUAK4 – August 2013
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WARNING
of
electrical
shock!
Figure
5.
for the UCD3138PFCEVM-030 board orientation.
Copyright © 2013, Texas Instruments Incorporated
High
voltage
CAUTION
CAUTION
Table
1, between 370 VDC and 400V DC;
Using the UCD3138PSFBEVM-027
Test Procedure
present
during
13
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