Test Procedure - Texas Instruments TPS546C25EVM-1PH User Manual

Implementation Results
4 Implementation Results

4.1 Test Procedure

4.1.1 Line and Load Regulation and Efficiency Measurement Procedure
1. Set up the EVM according to
2. Set the electronic load to draw 0A
3. Increase the V from 0V to 12V using a voltage meter to measure input voltage.
IN
4. Use the other voltage meter to measure output voltage V
5. Vary the load from 0 to 35A
6. Vary the V from 5V to 18V. V
IN
7. Decrease the load to 0A.
8. Decrease V to 0V.
IN
4.1.2 Efficiency Measurement Test Points
Measure the voltages at the correct location to evaluate the efficiency of the power train (device and inductor).
This action is necessary because otherwise the efficiency measurements include losses that are not related to
the power train. Losses incurred by the voltage drop in the copper traces and input and output connectors are
not related to the efficiency of the power train, which must not be included in efficiency measurements.
Input current is measured a between the input suppply and EVM input in the input wires, and output current is
measured in the output wires between the evm and load
Table 4-1 shows the measurement points for input and output voltage. VIN and VOUT are measured to calculate
the dc-dc converter efficiency. Using the VIN and VOUT measurement points results in efficiency measurements
that excluded losses due to the wires and connectors.
Test Point Node Name
Input voltage measurement point
TP3 PVIN_SNS
for PVIN
Input voltage measurement point
TP6 PGND_SNS
for PGND
Output voltage measurement
TP9 VOUT_REG
point for VOUT
Output voltage measurement
TP14 GND_REG
point for PGND
For more accurate efficiency measurements of the power train, remove the voltage drop between the power train
and the terminals from the measurement. Using the test points in
Test Point Node Name
Input voltage measurement point
TP3 PVIN_SNS
for PVIN
Input voltage measurement point
TP6 PGND_SNS
for PGND
Output voltage measurement
TP4 VOUT_EFF
point for VOUT
Output voltage measurement
TP16 GND_EFF
point for PGND
14 TPS546C25EVM-1PH 4V to 18V, 35A, Buck Converter with PMBus and
Telemetry Evaluation Module
Section 2.1.2 and
.
DC
. V must remain in regulation as defined in
DC OUT
must remain in regulation as defined in
OUT
Table 4-1. Test Points for Efficiency Measurements
Description
The pair of test points are connected to the PVIN/PGND pins of U1. The voltage drop between
input terminal to the device pins is included for efficiency measurement.
The pair of test points are connected near the output terminals. The voltage drop from the
output point of the inductor to the output terminals is included for efficiency measurement.
Table 4-2. Test Points for Better Efficiency Measurements
Description
The pair of test points are connected to the PVIN/PGND pins of U1. The voltage drop between
input terminal to the device pins is included for efficiency measurement.
This pair of test points are connected to VOUT and GND near the output inductor for U1 and
U1 PGND .
Copyright © 2024 Texas Instruments Incorporated
Section 4.1.2.
.
OUT
Comment
Table 4-2 reduces these losses.
Comment
Table 1-1.
Table 1-1.
SLUUCZ1 – JULY 2024
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