2 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54331EVM-232 and evaluation
modules. The section also includes test results typical for the evaluation modules and covers efficiency, output
voltage regulation, load transients, loop response, output ripple, input ripple, and start-up.
2.1 Input / Output Connections
The TPS54331EVM-232 is provided with input/output connectors and test points as shown in
. A power
supply capable of supplying 3 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 3 A. Wire
lengths must be minimized to reduce losses in the wires. Test-point TP1 provides a place to monitor the VIN
input voltages with TP2 providing a convenient ground reference. TP5 is used to monitor the output voltage with
TP6 as the ground reference.
Table 2-1. EVM Connectors and Test Points
REFERENCE
DESIGNATOR
FUNCTION
J1
VIN (see
for VIN range)
J2
2-pin header for enable. Connect EN to ground to disable, open to enable.
J3
2-pin header for slow start monitor and GND.
J4
VOUT, 3.3 V at 3-A maximum
TP1
VIN test point at VIN connector
TP2
GND test point at VIN
TP3
PH test point
TP4
Test point between voltage divider network and R3. Used for loop response measurements.
TP5
Output voltage test point at OUT connector
TP6
GND test point at OUT connector
2.2 Efficiency
The efficiency of this EVM peaks at a load current of about 0.6 A - 1 A and then decreases as the load
current increases towards full load.
shows the efficiency for the TPS54331EVM-232 at an ambient
temperature of 25°C.
0
10
20
30
40
50
60
70
80
90
100
0
0.5
1
1.5
2
2.5
3
I
- Output Current - A
O
Efficiency-%
V
= 7 V
IN
V
= 14 V
IN
V
= 21 V
IN
V
= 28 V
IN
Figure 2-1. TPS54331 Efficiency
Test Setup and Results
4
TPS54331 Step-Down Converter Evaluation Module User's Guide
SLVU247A – JULY 2008 – REVISED OCTOBER 2021
Copyright © 2021 Texas Instruments Incorporated
