4 Test Set Up
4.1 Equipment
4.1.1 Voltage Source
VIN:
The input voltage source (VIN) should be a 0-15 V variable dc source capable of 5 A
DC
. Connect VIN to J1
4.1.2 Meters
• A1: 0-3 A
DC
, ammeter
• V1: VIN, 0-15 V voltmeter
• V2: VOUT1 0-6 V voltmeter
• V3: VOUT2 0-4 V voltmeter
4.1.3 Loads
LOAD1:
The Output1 Load (LOAD1) should be an electronic constant current mode load capable of 0-2 A
DC
at
5.0 V
LOAD2:
The Output2 Load (LOAD2) should be an electronic constant current mode load capable of 0-2 A
DC
at
3.3 V
4.1.4 Oscilloscope
Oscilloscope:
A digital or analog oscilloscope can be used to measure the ripple voltage on VOUT. The
oscilloscope should be set for 1-MΩ impedance, 20-MHz bandwidth, ac coupling, 1-μs/division horizontal
resolution, 10-mV/division vertical resolution for taking output ripple measurements. TP3 and TP4 or TP18 and
TP19 can be used to measure the output ripple voltages by placing the oscilloscope probe tip through TP3 or
TP18 and holding the ground barrel to TP4 or TP19 as shown in
. For a hands free approach, the loop
in TP4 or TP19 can be cut and opened to cradle the probe barrel. Using a leaded ground connection may induce
additional noise due to the large ground loop area.
4.1.5 Recommended Wire Gauge
VIN to J1:
The connection between the source voltage, VIN and J1 of HPA241 can carry as much as 5 A
DC
. The
minimum recommended wire size is AWG #16 with the total length of wire less than 4 feet (2 feet input, 2 feet
return).
J2 to LOAD1:
The power connection between J2 of HPA241 and LOAD1 can carry as much as 2 A
DC
. The
minimum recommended wire size is AWG #18, with the total length of wire less than 2 feet (1 foot output, 1 foot
return).
J3 to LOAD2:
The power connection between J3 of HPA241 and LOAD2 can carry as much as 2 A
DC
. The
minimum recommended wire size is AWG #18, with the total length of wire less than 2 feet (1 foot output, 1 foot
return).
4.1.6 Other
Fan:
This evaluation module includes components that can get hot to the touch, because this EVM is not
enclosed to allow probing of circuit nodes, a small fan capable of 200-400 lfm is recommended to reduce
component surface temperatures to prevent user injury. The EVM should not be left unattended while powered.
The EVM should not be probed while the fan is not running.
Test Set Up
8
TPS54383 Step-Down Converter Evaluation Module User's Guide
SLUU285D – JULY 2007 – REVISED OCTOBER 2021
Copyright © 2021 Texas Instruments Incorporated
