Test Procedure; Line And Load Regulation Measurement Procedure; Efficiency - Texas Instruments TPS543C20AEVM-054 User Manual

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8

Test Procedure

8.1

Line and Load Regulation Measurement Procedure

1. Connect VOUT to J2 and VOUT_GND to J2
2. Ensure that the electronic load is set to draw 0 A
3. Ensure the jumper provided on the EVM shorts on J3 before V
4. Connect VIN to J1 and VIN_GND to J1
5. Increase V from 0 V to 12 V using the digital multimeter to measure input voltage.
IN
6. Remove the jumper on J3 to enable the controller.
7. Use the other digital multimeter or the oscilloscope to measure output voltage V
Test Point Node Name
TP3
TP10
TP1
TP4
8. Vary the load from 0 A
Table 1.
9. Vary V from 5 V to 16 V. V
IN
10. Decrease the load to 0 A.
11. Put the jumper back on JP3 to disable the converter.
12. Decrease V to 0 V or turn off the supply.
IN
8.2

Efficiency

To measure the efficiency of the power train on the EVM, it is important to measure the voltages at the
correct location. This is necessary because otherwise the measurements will include losses in efficiency
that are not related to the power train itself. Losses incurred by the voltage drop in the copper traces and
in the input and output connectors are not related to the efficiency of the power train, and they must not be
included in efficiency measurements.
Test Point Node Name
TP3
TP10
TP1
TP4
Input current can be measured at any point in the input wires, and output current can be measured
anywhere in the output wires of the output being measured. Using these measurement points result in
efficiency measurements that do not include losses due to the connectors and PCB traces.
SLUUBZ2 – December 2018
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Figure
Table 3. List of Test Points for Line and Load Measurements
LocS+ Sense VOUT + locally across C11. Use for efficiency and ripple measurements
LocS- Sense VOUT - locally across C11. Use for efficiency and ripple measurements
PVIN Sense VIN + across C8
PGND Sense VIN - across C8
to maximum rated output 40 A
DC
must remain in regulation as defined in
OUT
Table 4. List of Test Points for Efficiency Measurements
LocS+ Sense VOUT + locally across C11. Use for efficiency and ripple measurements
LocS- Sense VOUT - locally across C11. Use for efficiency and ripple measurements
PVIN Sense VIN + across C8
PGND Sense VIN - across C8
Copyright © 2018, Texas Instruments Incorporated
Figure 2.
.
DC
is applied
IN
2.
Description
. V must remain in regulation as defined in
DC OUT
Description
TPS543C20AEVM-054 40-A Single Phase Synchronous Step-Down
Test Procedure
at TP3 and TP10.
OUT
Table 1.
Converter
9