Test Procedure; Line/Load Regulation And Efficiency Measurement Procedure; Efficiency; Equipment Shutdown - Texas Instruments TPS544 20 Series User Manual

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6 Test Procedure

6.1 Line/Load Regulation and Efficiency Measurement Procedure

1. Set up the EVM as described in
2. Ensure that the electronic load is set to draw 0 A
3. Increase V from 0 V to 12 V using the DMM to measure input voltage.
IN
4. Use the other DMM to measure output voltage V
5. Vary the load from 0 A
must remain in regulation as defined in
6. Vary V from 8 V to 14 V. V
IN
7. Decrease the load to 0 A.
8. Decrease V to 0 V.
IN

6.2 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
TP8
TP9
TP7
TP11
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.

6.3 Equipment Shutdown

1. Reduce the load current on both outputs to 0 A.
2. Reduce input voltage to 0 V.
3. Shut down the external fan if in use.
4. Shut down equipment.
SLUUAY7B – MAY 2014 – REVISED AUGUST 2021
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Section 4.3 and
to maximum rated output A
DC
Table 2-1.
must remain in regulation as defined in
OUT
Table 6-1. List of Test Points for Efficiency Measurements
NODE NAME
VIN Measurement point for VIN +VE
PGND Measurement point for VIN –VE
VOUT Measurement point for VOUT +VE
PGND Measurement point for VOUT –VE
Copyright © 2021 Texas Instruments Incorporated
Figure 4-1.
.
DC
.
OUT
(TPS544B20 = 20 A, TPS544C20 = 30 A). V
DC
Table
DESCRIPTION
TPS544x20 Step-Down Converter Evaluation Module User's Guide
Test Procedure
OUT
2-1.
11