Configurations

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Test Procedure

Line/Load Regulation and Efficiency Measurement Procedure

1. Set up EVM as described in the Test Setup section and Figure 3.

2. Ensure Load is set to constant resistance mode and to sink 0 A

3. Ensure all jumpers set per the Configurations section.

4. Ensure the jumper provided in the EVM shorts on J2 before V

5. Increase V

6. Remove the jumper on J2 to enable the controller.

7. Use V2 to measure V

8. Vary load from 0 A

9. Vary V

10. Put the jumper on J2 to disable the converter.

11. Decrease load to 0 A.

12. Decrease V

Control Loop Gain and Phase Measurement Procedure

TPS53513EVM-PWR587 contains a 10-

Ω series resistor in the feedback loop for loop response analysis.

1. Set up EVM as described in the Test Setup section and Figure 3.

2. Connect isolation transformer to test points marked TP5 and TP8.

3. Connect input signal amplitude measurement probe (channel A) to TP10. Connect 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 isolation transformer from bode plot test points before making other measurements (Signal

injection into feedback may interfere with accuracy of other measurements).

8

High Performance 8-A Single Synchronous Step-Down Converter Using the

SLUUAQ0B – October 2013 – Revised February 2014

TPS53513EVM-PWR587

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