5 Test Setup
5.1 Test Equipment
5.1.1 Voltage Source
VIN:
The input voltage source (VIN) shall be a 0-V to 15-V variable DC source capable of supplying 2.5 A
DC
.
5.1.2 Meters
•
A1:
Input current meter (0 A
DC
to 2.5 A
DC
).
•
V1:
Input voltage meter (0 V to 15 V).
•
V2:
Output voltage meter (0 V to 2 V).
5.1.3 Load
LOAD:
Output load. Electronic load set for constant current or constant resistance mode, capable of 0 A
DC
to 15
A
DC
at 1.0 V
DC
.
5.1.4 Oscilloscope
For Output Voltage Ripple:
Oscilloscope shall be an analog or digital oscilloscope set for AC coupled
measurement with 20-MHz bandwidth limiting. Use 20-mV/div vertical resolution, 1.0-µs/div horizontal resolution.
For Switching Waveforms:
Oscilloscope shall be an analog or digital Oscilloscope set for DC coupled
measurement with 20-MHz bandwidth limiting. Use 2-V/div or 5-V/div vertical resolution and 1.0-µs/division
horizontal resolution.
5.1.5 Fan
The TPS56121EVM-601 Evaluation Module includes components that can get hot to touch when operating.
Because this evaluation module is not enclosed to allow probing of circuit nodes, a small fan capable of 200 lfm
to 400 lfm is recommended to reduce component temperatures when operating.
5.2 Recommended Wire Gauge
5.2.1 VIN to J1
The connection between the source voltage (VIN) and J1 of TPS56121EVM-601 can carry as much as 2.5 A
DC
of current. The minimum recommended wire size is AWG #16 with the total length of wire less than 2 feet (1 foot
input, 1 foot return)
5.2.2 J2 to LOAD
The connection between the LOAD and J2 of TPS56121EVM-601 can carry as much as 15 A
DC
of current. The
minimum recommended wire size is 2xAWG #14 with the total length of wire less than 2 feet (1 foot input, 1 foot
return).
Test Setup
SLVU445C – MARCH 2011 – REVISED AUGUST 2021
TPS56121 Step-Down Converter Evaluation Module User's Guide
7
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