Texas Instruments TPS54233, Руководство пользователя

Страница: 3 / 19

1.3 Modifications
These evaluation modules are designed to provide access to the features of the TPS54233. Some modifications
can be made to this module.
1.3.1 Output Voltage Set Point
To change the output voltage of the EVM, it is necessary to change the value of resistor R
6
. Changing the value
of R
6
can change the output voltage above 0.8 V. The value of R
6
for a specific output voltage can be calculated
using Equation 1 .
6
0.8
10.2
0.8
= W ´
-
Out
V
R k
V V
(1)
Table 1-3 lists the R
6
values for some common output voltages. Note that V
IN
must be in a range so that the
minimum on-time is greater than 160 ns, and the maximum duty cycle is less than 90%. The values given in
Table 1-3 are standard values, not the exact value calculated using Equation 1 .
Table 1-3. Output Voltages Available
Output Voltage
(V)
R
6
Value (kΩ)
1.8 8.25
2.5 4.75
3.3 3.24
5 1.96
2 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54233EVM-373 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 TPS54233EVM-373 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 load must
be connected to J4 through a pair of 20 AWG wires. The maximum load current capability must be 2 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. TP5 is used to monitor the output voltage with TP6
as the ground reference.
www.ti.com Introduction
SLVU264A – NOVEMBER 2008 – REVISED OCTOBER 2021
Submit Document Feedback
TPS54233 Step-Down Converter Evaluation Module User's Guide 3
Copyright © 2021 Texas Instruments Incorporated