Texas Instruments TPS543820EVM, User Manual, Page: 10 / 38

Table 3-2. Test Points
REFERENCE
DESIGNATOR
NAME RELATED IC FUNCTION
TP1 VIN_U1 U1 VIN test point. Use this for efficiency measurements.
TP2 VOUT_U1 U1 VOUT test point. Use this for efficiency, output regulation, and bode plot measurements.
TP3 SW_U1 U1 SW node solder mask opening
TP4 PGND_U1 U1 PGND test point
TP5 PGND_EFF_U1 U1 PGND test point. Use this for efficiency measurements.
TP6 PGOOD_U1 U1 PGOOD test point
TP7 EN_U1 U1
EN test point. If applying an external voltage, it must be kept below the absolute maximum
voltage of the EN pin of 6 V.
TP8 AGND_U1 U1 AGND test point
TP9 BODE_U1 U1
Test point between voltage divider network and output voltage. Used for Bode plot
measurements.
TP10 VOUT_U1 U1
SMB connector to measure output voltage. When using this test point, the scope should
be set for 1-MΩ termination. When using 50-Ω termination, a 2:1 divider is created.
TP11 VIN Both VIN test point near input terminals
TP12 VIN_U2 U2 VIN test point. Use this for efficiency measurements.
TP13 SW_U2 U2 SW node solder mask opening
TP14 SW_U2 U2 SW node test point
TP15 VOUT_U2 U2 VOUT test point. Use this for efficiency, output regulation, and bode plot measurements.
TP16 PGND_U2 U2 PGND test point
TP17 PGND_EFF_U2 U2 PGND test point. Use this for efficiency measurements.
TP18 PGOOD_U2 U2 PGOOD test point
TP19 PGND Both PGND test point near input terminals
TP20 AGND_U2 U2 AGND test point
TP21 BP5_U2 U2 BP5 test point
TP22 BODE_U2 U2
Test point between voltage divider network and output voltage. Used for Bode plot
measurements.
TP23 EN_U2 U2
EN test point. If you are applying an external voltage, it must be kept below the absolute
maximum voltage of the EN pin of 6 V.
TP24 VO_ADJ U2
Test point for injecting current into the FB divider to adjust the DC output voltage or inject a
step to FB to test OVP
TP25 VO_2NDSTG U2 Test point to measure output voltage after second stage filter if added to EVM.
TP26 SYNC Both
SYNC test point. Supply an external clock to this test point to synchronize both regulators
to it.
TP27 FSEL U2 FSEL test point
TP28 SW_U2 U2
SMB connector to measure SW node. When using this test point, the scope should be
set for 50-Ω termination. The combination of 50-Ω termination and 450-Ω series resistance
creates a 10:1 attenuation.
TP29 VOUT_U2 U2
SMB connector to measure output voltage. When using this test point, the scope should
be set for 1-MΩ termination. When using 50-Ω termination, a 2:1 divider is created.
TP30 VO_2NDSTG U2
SMB connector to measure output voltage after second stage filter if added to EVM. When
using this test point, the scope should be set for 1-MΩ termination. When using 50-Ω
termination, a 2:1 divider is created.
TP31 FGEN Both
Test point to connect function generator to load transient circuit. Slowly increase amplitude
and vary slew rate of function generator for desired load step.
TP32 ISNS Both Test point to measure current in load transient circuit. Gain is 20 A/V.
TP33 PGND Both PGND test point for load transient circuit
TP34 MODE U2 MODE test point
Test Setup and Results www.ti.com
10 TPS543820EVM SWIFT™ Step-Down Converter Evaluation Module User's
Guide SLUUCE9A – DECEMBER 2020 – REVISED APRIL 2021
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