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STD Fiches technique(PDF) 2 Page - Texas Instruments

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Description  TPS84250EVM-001 2.5-A, Integrated Power Solution
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User's Guide
SLVU460A – November 2011 – Revised July 2012
TPS84250EVM-001 2.5-A, Integrated Power Solution
Evaluation Module
The TPS84250EVM-001 evaluation module is designed as an easy-to-use platform for evaluating the
features and performance of the Integrated Power Solution (IPS) device. This user's guide provides
information on the correct usage of the TPS84250EVM-001 and an explanation of the numerous test
points on the board.
1
Description
The TPS84250EVM-001 evaluation module (EVM) features a TPS84250 device configured for operation
from a 7-V to 50-V input supply. The output voltage can be set to one-of-five popular values by using a
simple configuration jumper. Similarly, the switching frequency can be set to one-of-four values by use of
a jumper. The full, 2.5-A-rated output current can be supplied by the EVM. A minimal amount of input and
output capacitance is used on the board. Component pads are provided for additional input and output
capacitors if desired. A simple 5-V pullup supply for the PWRGD pin is provided on the EVM. It is powered
from the input voltage supply. Test points are provided that allow measurement of efficiency, power
dissipation, input ripple, output ripple, line and load regulation, soft-start behavior, transient response, and
undervoltage lockout (UVLO) behavior. The EVM uses a recommended printed-circuit board (PCB) layout
that maximizes thermal performance and minimizes output ripple and noise.
2
Getting Started
The host power supply is connected to the EVM at terminal block TB1. The Vin and GND terminals are
clearly marked. The terminal block can accept up to 16 AWG wire. For a complete evaluation, the host
supply must be adjustable up to 50 V and be capable of delivering at least 3 A of current. The output of
the EVM is presented to terminal block TB2. An electronic or resistive load can be connected to the block.
Input and output voltage test points are provided near the terminal blocks. These test points are intended
to be used as voltage monitoring points where voltmeters can be connected to measure Vin and Vout. Do
not use these test points as the input supply or output load connection points. The PCB traces connecting
to the test points are not designed to support high currents.
Before applying power, ensure that the Fsw select (J3) and Vout select (J4) jumpers are present and
properly positioned for the intended output voltage. SeeTable 1 for the recommended jumper setting.
Always remove power before changing the jumper settings.
Once the jumper settings have been confirmed, set the host input supply to a voltage level at least 3 volts
higher than the selected output voltage or 7 V, whichever is greater. (The minimum input voltage
specification for the TPS84250 is (Vout + 3) or 7 V, whichever is greater.) Turn the host supply on, and
then confirm that the selected output voltage is obtained.
Table 1. Output Voltage and Switching Frequency Jumper Settings
Vout Select, J2 (V)
Fsw Select, J1
Minimum V
IN (V)
2.5
400 kHz
7
3.3
400 kHz
7
5
500 kHz
8
12
800 kHz
15
15
1 MHz
18
2
TPS84250EVM-001 2.5-A, Integrated Power Solution Evaluation Module
SLVU460A – November 2011 – Revised July 2012
Submit Documentation Feedback
Copyright © 2011–2012, Texas Instruments Incorporated


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