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4.2.2 Power On for the First Time
1. Verify VIN is off/disabled and no voltage is applied to the UUT.
2. Connect oscilloscope probes to VIN (20 V/DIV), VDD (4 V/DIV), and COMP (2 V/DIV).
3. Connect the differential probe to VO and ISO_GND at low range, 1/20 (scaled to 4 V/DIV).
4. Set the oscilloscope to single-trigger on VIN rising at 25 V. Set a time base of 50 ms/DIV.
5. Verify that the load is set to 0.25 A and is still enabled.
6. Turn on the VIN supply at 50 V. The oscilloscope should trigger and produce the waveforms shown in figure
5-6. If your result is the same as figure 5-6 then your EVM is functioning correctly, thus far. If your result
does not resemble figure 5-6 then stop. Troubleshoot the EVM at 50 VIN. Do not increase VIN until after
troubleshooting.
7. When VIN is 50 V only and with 0.25 A load, verify the following DC measurements at the test points:
a. VOUT+ (yellow TP) to ISO_GND ≈ 16.4 Vdc
b. V_AUX (white TP) to GND ≈ 18.7 Vdc
c. VDD (white TP) to GND ≈ 18.6 Vdc
d. VREF (white TP) to GND = 5.0 Vdc
e. FB (white TP) to GND = 2.5 Vdc
8. Turn off the VIN supply.
9. Increase VIN to 400 V with 1.3 A load and repeat steps 4 to 8. Verify that VOUT is OK at this condition.
10. Turn off the VIN supply.
11. Increase VIN to 800 V. At 800 V and 0.25 A load [and 2.7 A load] your result should be similar to figure
5-7 [and figure 5-8]. If your results are the same as figure 5-7 and 5-8 at 800 V then your EVM is 100%
functioning correctly and you can proceed with other tests.
Lab HV
Digital
DC Power
Mul
m eter
¢
Supply
for Current
Measureme
nt
Figure 4-1. UCC28C56EVM-066, Recommended Efficiency and Typical Test Setup
SLUUCN1C – JUNE 2022 – REVISED DECEMBER 2022
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Digital
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VIN DMM
1000V Input
Capable
GND
TP
VIN+
GND
Copyright © 2022 Texas Instruments Incorporated
Digital
Mul meter
VO DMM
for Voltage
Measureme
nt
VIN
ISO_GND TP
TP
Using the UCC28C56EVM-066 High-Density 40-W Auxiliary Power Supply for
EVM Setup and Operation
VO TP
ISO_GND
Electronic
Digital
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VOUT
£
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Measureme
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800-V Traction Inverters
Load
7
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