Texas Instruments TPS53513, User Manual

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7 Test Procedure
7.1 Line/Load Regulation and Efficiency Measurement Procedure
1. Set up the EVM as described in Section 5 and Figure 5-2 .
2. Ensure the load is set to constant resistance mode and to sink 0 A
DC
.
3. Ensure all jumpers set per Section 6 .
4. Ensure the jumper provided in the EVM shorts on J2 before V
IN
is applied.
5. Increase V
IN
from 0 V to 12 V. Using V1 to measure input voltage.
6. Remove the jumper on J2 to enable the controller.
7. Use V2 to measure V
OUT
voltage.
8. Vary load from 0 A
DC
to 10 A
DC
, V
OUT
must remain in load regulation.
9. Vary V
IN
from 8 V to 14 V, V
OUT
must remain in line regulation.
10. Put the jumper on J2 to disable the converter.
11. Decrease load to 0 A.
12. Decrease V
IN
to 0 V.
7.2 Control Loop Gain and Phase Measurement Procedure
The TPS53513EVM-PWR587 contains a 10-Ω series resistor in the feedback loop for loop response analysis.
1. Set up the EVM as described in Section 5 and Figure 5-2 .
2. Connect the isolation transformer to test points marked TP5 and TP8.
3. Connect input signal amplitude measurement probe (channel A) to TP10. Connect the output signal
amplitude measurement probe (channel B) to TP11.
4. Connect ground lead of channel A and channel B to TP15.
5. Inject around 20-mV or less signal through the isolation transformer.
6. Sweep the frequency from 100 Hz to 1 MHz with 10 Hz or lower post filter. The control loop gain and phase
margin can be measured.
7. Disconnect the isolation transformer from bode plot test points before making other measurements (signal
injection into feedback may interfere with accuracy of other measurements).
www.ti.com Test Procedure
SLUUAQ0C – OCTOBER 2013 – REVISED NOVEMBER 2021
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TPS53513 Step-Down Converter Evaluation Module User's Guide 7
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