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7 Test Procedure
7.1 Line and Load Regulation and Efficiency Measurement Procedure
1. Set up the EVM as described in
2. Ensure the load is set to constant-resistance mode and to sink at 0 ADC.
3. Ensure all jumper setting are configured as shown in
4. Ensure the jumper provided in the EVM shorts on J2 before VIN is applied.
5. Increase VIN from 0 to 12 V. Use V1 to measure input voltage.
6. Remove the jumper on J2 to enable the controller.
7. Use V2 to measure the VOUT voltage.
8. Vary the load from 0 to 10 ADC, VOUT must remain in load regulation.
9. Vary VIN from 8 to 14 V, VOUT must remain in line regulation.
10. To disable the converter, place the jumper on J2.
11. Decrease the load to 0 A
12. Decrease VIN to 0 V.
7.2 Control-Loop Gain and Phase-Measurement Procedure
The TPS53515EVM-PWR587 contains a 10-Ω series resistor in the feedback loop for loop response analysis.
1. Set up the EVM as described in
2. Connect the isolation transformer to the test points marked TP5 and TP8.
3. Connect the input-signal amplitude-measurement probe (channel A) to TP10. Connect the output-signal
amplitude-measurement probe (channel B) to TP11.
4. Connect the ground lead of channel A and channel B to TP15.
5. Inject around 20 mV or less signal through the isolation transformer.
6. To measure control-loop gain and phase margin, change the frequency from 100 Hz to 1 MHz using a 10-Hz
or less post filter.
7. Disconnect the isolation transformer from the bode-plot test points before making other measurements.
•
Signal injection into feedback can interfere with the accuracy of other measurements.
SLUUAS1C – OCTOBER 2013 – REVISED NOVEMBER 2021
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Section 5
and
Figure
5-2.
Section
Section 5
and
Figure
5-2.
TPS53515 Step-Down Converter Evaluation Module User's Guide
Copyright © 2021 Texas Instruments Incorporated
6.
Test Procedure
7
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