Texas Instruments TPS53313EVM-078, User Manual

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7 Test Procedure
7.1 Line/Load Regulation and Efficiency Measurement Procedure
1. Set up EVM as described in Section 5 and Figure 5-2 .
2. Ensure Load is set to constant resistance mode and to sink 0 A
DC
.
3. Ensure all jumpers set per Section 6 .
4. Increase VIN from 0 V to 12 V. Using V1 to measure VIN voltage.
5. Open jumper J1 to enable the controller.
6. Use V2 to measure VOUT voltage, A1 to measure VIN current.
7. Vary load from 0 A
DC
to 6 A
DC
, VOUT should remain in load regulation.
8. Vary VIN from 8.0 V to 14 V, VOUT should remain in line regulation.
9. Short jumper J1 to disable the controller.
10. Decrease load to 0 A.
11. Decrease VIN to 0 V.
7.2 Control Loop Gain and Phase Measurement Procedure
TPS53313EVM-078 contains a 10-Ω series resistor in the feedback loop for loop response analysis.
1. Set up EVM as described in Section 5 and Figure 5-2 .
2. Connect isolation transformer to test points marked TP12 and TP11.
3. Connect input signal amplitude measurement probe (channel A) to TP12. Connect output signal amplitude
measurement probe (channel B) to TP11.
4. Connect ground lead of channel A and channel B to TP13.
5. Inject around 10-mV or less signal through the isolation transformer.
6. Sweep the frequency from 500 Hz to 500 kHz 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).
7.3 List of Test Points
Table 7-1. Test Point Functions
TEST POINTS NAME DESCRIPTION
TP1 EN Enable pin
TP2 GND GND
TP3 VIN Input voltage
TP4 PG Power good output
TP5 SYNC Input of external clock for synchronization
TP6 GND GND
TP7 GND GND
TP8 GND GND
TP9 SW Switching node
TP10 VOUT Output voltage
TP11 CHB Input B for loop injection
TP12 CHA Input A for loop injection
TP13 GND GND
TP14 GND GND
7.4 Equipment Shutdown
1. Shut down VIN
2. Shut down Load
3. Shut down FAN
Test Procedure www.ti.com
8 TPS53313 Step-Down Converter Evaluation Module User's Guide SLUU819A – DECEMBER 2011 – REVISED DECEMBER 2021
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