Test Procedure; Line/Load Regulation And Efficiency Measurement Procedure; Control Loop Gain And Phase Measurement Procedure; List Of Test Points - Texas Instruments TPS53313EVM-078 User Manual

Test Procedure

7 Test Procedure

7.1 Line/Load Regulation and Efficiency Measurement Procedure

1. Set up EVM as described in
2. Ensure Load is set to constant resistance mode and to sink 0 A
3. Ensure all jumpers set per
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
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
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

TEST POINTS
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP9
TP10
TP11
TP12
TP13
TP14

7.4 Equipment Shutdown

1. Shut down VIN
2. Shut down Load
3. Shut down FAN
8 TPS53313 Step-Down Converter Evaluation Module User's Guide
Section 5 and Figure
Section 6.
to 6 A , VOUT should remain in load regulation.
DC
Section 5 and Figure
Table 7-1. Test Point Functions
NAME DESCRIPTION
EN Enable pin
GND GND
VIN Input voltage
PG Power good output
SYNC Input of external clock for synchronization
GND GND
GND GND
GND GND
SW Switching node
VOUT Output voltage
CHB Input B for loop injection
CHA Input A for loop injection
GND GND
GND GND
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DC
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SLUU819A – DECEMBER 2011 – REVISED DECEMBER 2021
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