Texas Instruments TPS54320, User Manual

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1.3.5 Input Voltage Rails
The EVM is designed to accommodate different input voltage levels for the power stage and control logic. During
normal operation, the PVIN and VIN inputs are connected together using a jumper across JP1. The single input
voltage is supplied at J1. If desired, these two input voltage rails may be separated by removing the jumper
across JP1. Two input voltages, which could be at different voltages, must then be provided at both J1 and J2.
2 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54320 evaluation module. The section
also includes test results typical for the evaluation module and covers efficiency, output voltage regulation, load
transients, loop response, output ripple, input ripple, and start-up.
2.1 Input / Output Connections
The TPS54320 is provided with input/output connectors and test points as shown in Table 2-1 . A power supply
capable of supplying 2 A must be connected to J1 through a pair of 20 AWG wires. The jumper across JP1 must
be in place. See
Section 1.3.5 for split input voltage rail operation. The load must be connected to J3 through
a pair of 20 AWG wires. The maximum load current capability must be 3 A. Wire lengths must be minimized to
reduce losses in the wires. Test-point TP1 provides a place to monitor the V
IN
input voltages with TP2 providing
a convenient ground reference. TP8 is used to monitor the output voltage with TP9 as the ground reference.
Table 2-1. EVM Connectors and Test Points
Reference Designator Function
J1 PVIN input voltage connector. (see Table 1-1 for V
IN
range).
J2 VIN input voltage connector. Not normally used.
J3 V
OUT
, 3.3 V at 3 A maximum.
J4 2-pin header for tracking output and ground.
J5 2-pin header for tracking voltage input and ground.
JP1 PVIN to VIN jumper. Normally closed to tie VIN to PVIN for common rail voltage operation.
JP2 2-pin header for enable. Connect EN to ground to disable, open to enable.
TP1 PVIN test point at PVIN connector.
TP2 GND test point at PVIN connector.
TP3 VIN test point at VIN connector.
TP4 GND test point at VIN connector.
TP5 PH test point.
TP6 Slow start / track in test point.
TP7 Test point between voltage divider network and output. Used for loop response measurements.
TP8 Output voltage test point at V
OUT
connector.
TP9 GND test point at V
OUT
connector.
TP10 PWRGD test point.
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4 TPS54320 Step-Down Converter Evaluation Module User's Guide SLVU380A – SEPTEMBER 2010 – REVISED OCTOBER 2021
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