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).