Texas Instruments TPS548A28, User Manual, Page: 5 / 25

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Test Setup and Results
5 SLVUBO0A – March 2020 – Revised May 2020
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Using the TPS54JA20EVM-023 12-A, Buck Converter Evaluation Module
2 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54JA20EVM. This section also
includes test results typical for the evaluation module and covers efficiency, output voltage regulation, load
transient, loop response, output ripple, and start-up.
2.1 Input/Output Connections
The TPS54JA20EVM is provided with input/output connectors and test points as shown in Table 5 . A
power supply capable of supplying greater than 15 A must be connected to J1 and J2 through a pair of
20-AWG wires or better. The load must be connected to J3 and J4 through a pair of 20-AWG wires or
better on each connector. The maximum load current capability is 12 A.
Wire lengths must be minimized to reduce losses in the wires. Test point VI provides a place
to monitor the input voltage with Test point VIN_SENSE- providing a convenient ground reference. Test
point VOUT+ is used to monitor the output voltage with VOUT- as the ground reference.
Table 5. TPS54JA20EVM EVM Connectors and Test Points
REFERENCE
DESIGNATOR
FUNCTION
J1 VIN input voltage connector (see Table 1 for V
IN
range)
J2 PGND connection for input
J3 VOUT, 2.5V at 12A maximum
J4 PGND connection for output
J5
3-pin header for enable. ON -> Connects EN to VIN to enable the device. OFF- > Connects EN to GND
to disable device. Floating EN will prevent the part from operating.
J6 12 Pin header for Mode selection (see Table 3 )
VI,
VIN_SENSE-
VIN voltage sensing test points
VOUT+, VOUT- VOUT voltage sensing test points
VCC, PGND VCC voltage forcing/sensing test points
PGOOD PGOOD output test point (pulled up to VCC pin through a 30k
Ω
resistor)
EN EN test point
VSNS+, VSNS- Remote sensing test points
AGND AGND test point
BODE+, BODE- Loop measurement test points (BODE+ is at the same net as VOUT, but is closer to FB divider and IC)
SS/REFIN Can be used to monitor the reference voltage
SW Switch Node test point
2.2 Start Up Procedure
1. Make sure the EN jumper (J5) is in the ON position (shorting pin 2 and pin 3) to connect the EN pin to
the resistor divider from VIN.
2. (Optional) Apply appropriate external bias voltage on VCC and PGND test points. If no external bias,
please go directly to step 3. The external bias range is 3.3V to 5.3V.
3. Apply appropriate VIN voltage to the VIN and PGND terminals at J1 and J2.