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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 must then be provided at both J1 and J2. C1 is provided for adding additional
input capacitance for the PVIN input, if desired.
2 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54521EVM-607 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 TPS54521EVM-607 is provided with input/output connectors and test points as shown in
supply capable of supplying 3 A must be connected to J1 through a pair of 20 AWG wires. The jumper across
JP1 must be in place. See
J3 through a pair of 20 AWG wires. The maximum load current capability must be 5 A. Wire lengths must be
minimized to reduce losses in the wires. Test-point TP1 provides a place to monitor the V
TP2 providing a convenient ground reference. TP8 is used to monitor the output voltage with TP9 as the ground
reference.
REFERENCE
DESIGNATOR
J1
PVIN input voltage connector. See
J2
VIN input voltage connector. Not normally used
J3
V
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
TP9
GND test point at V
TP10
PWRGD test point
SLVU379A – AUGUST 2010 – REVISED AUGUST 2021
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Section 1.3.5
for split input voltage rail operation. The load must be connected to
Table 2-1. EVM Connectors and Test Points
, 3.3 V at 5-A maximum
OUT
connector
OUT
connector
OUT
Copyright © 2021 Texas Instruments Incorporated
FUNCTION
Table 1-1
for V
range.
IN
TPS54521 Step-Down Converter Evaluation Module User's Guide
Introduction
Table
2-1. A power
input voltages with
IN
5
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