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3.2
Maximum Output Current
After adjusting input or output voltage settings, verify the maximum output current pursuant to the
equations given on the data sheet (SLVSBX8).
3.3
Slow-Start Time
Adjust the slow-start time by changing the value of C3. The EVM uses C3 = 0.047 µF, as recommended
on the data sheet, avoiding any overshoot during start-up. A larger capacitance increases the slow-start
time while a smaller capacitance decreases it.
3.4
Other Modifications
Please see data sheet recommendations and equations when changing the switching frequency,
input/output voltage range, input inductor, output capacitors or compensation.
4
Test Setup and Results
This section describes how to properly connect, set up, and use the EVM. Included are test results typical
for the evaluation module covering efficiency, output voltage regulation, load transients, loop response,
output ripple, input ripple, start-up and shut-down.
4.1
Input/Output Connections
The EVM is provided with input and output connectors and test points as shown in
power supply capable of supplying 5 A to J6 through a pair of 20-AWG wires. The jumper across JP1 in
the ON position (1-2) must be in place. Connect the load to J7 through a pair of 20-AWG wires. The
maximum load-current capability must be at least 2.1 A. Minimize wire lengths to reduce losses in the
wires. Header J1 provides a place to monitor the V
reference. Use J2 to monitor the output voltage with J4 as the ground reference.
Reference Designator
J1
J2
J3, J4
J5
J6
JP1
TP1
TP2
TP3
TP4
TP5
SLVU930 – July 2013
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Table 3. EVM Connectors and Test Points
2-pin header for V
input voltage connections
IN
2-pin header for V
input voltage connections
OUT
2-pin header for GND connections
2-pin header for synchronizing signal and ground
V
input voltage connector. (See
IN
3-pin header for enable. Jumper installed from pins 1-2 enables and from pins 2-3 disables.
SW test point
Test point between voltage divider network and output. Used for loop-response measurements.
COMP test point
Output voltage test point at V
OUT
GND test point at V
connector
OUT
TPS55330EVM-017 2.9-V to 4.2-V Input, 5.0-V Output Boost Evaluation
Copyright © 2013, Texas Instruments Incorporated
input voltages with J3 providing a convenient ground
IN
Function
Table 1
for V
range.)
IN
connector
Test Setup and Results
Table
3. Connect a
3
Module
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