5 EVM Configuration Using the Fusion GUI
The TPSM8D6C24 leaves the factory pre-configured. The factory default settings for the parameters can be
found in the data sheet. If configuring the EVM to settings other than the factory defaults, use the software
described in
. It is necessary to have the input voltage applied to the EVM prior to launching the
software so that the TPSM8D6C24 can respond to the GUI and the GUI can recognize the device. The default
configuration for the EVM to stop converting is set by the EN/UVLO resistor divider to a nominal input voltage of
3.5 V, therefore, if it is necessary to avoid any converter activity during configuration, an input voltage less than
3.5 V should be applied. TI recommends an input voltage of 3.3 V.
5.1 Configuration Procedure
1. Adjust the input supply to provide 3.3 VDC, current limited to 1 A.
2. Apply the input voltage to the EVM. See
for connections and test setup.
3. Launch the Fusion GUI software. See the screen shots in
4. Configure the EVM operating parameters as desired.
6 Test Procedure
6.1 Line and Load Regulation and Efficiency Measurement Procedure
1. Set up the EVM as
describe.
2. Set the electronic load to draw 0 A
DC
.
3. Increase V
IN
from 0 V to 12 V using a voltage meter to measure input voltage.
4. Use the other voltage meter to measure output voltage, V
OUT
.
5. Vary the load from 0 to 35 A
DC
. V
OUT
should remain in regulation as defined in
6. Vary V
IN
from 5 V to 16 V. V
OUT
should remain in regulation as defined in
.
7. Decrease the load to 0 A.
8. Decrease V
IN
to 0 V.
6.2 Efficiency Measurement Test Points
To evaluate the efficiency of the power train (device and inductor), it is important to measure the voltages at
the correct location. This is necessary because otherwise the measurements will include losses 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, which should not be included in efficiency
measurements.
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.
shows the measurement points for input voltage and output voltage. VIN and VOUT are measured
to calculate the efficiency. Using these measurement points will result in efficiency measurements that excluded
losses due to the wires and connectors.
Table 6-1. Test Points for Efficiency Measurements
Test Point
Node Name
Description
Comment
VOUT_A
TP1
PVIN
Input voltage measurement point
for VIN+
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.
TP3
PGND
Input voltage measurement point
for VIN– (GND)
TP6
VOUT_A
Output voltage measurement
point for VOUT+
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.
TP10
PGND
Output voltage measurement
point for VOUT– (GND)
VOUT_B
TP1
PVIN
Input voltage measurement point
for VIN+
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.
TP2
PGND
Input voltage measurement point
for VIN– (GND)
EVM Configuration Using the Fusion GUI
SLUUCK6 – DECEMBER 2021
TPSM8D6C24EVM-2V0 User's Guide
9
Copyright © 2021 Texas Instruments Incorporated
