7 Test Setup
7.1 Test Equipment
7.1.1 Voltage Source
The input voltage source V
IN
should be a variable DC source between 0 V and 14 V, capable of supplying 10
A
DC
. Connect V
IN
7.1.2 Multimeters
A voltmeter between 0 V and 15 V should be used to measure V
IN
at TP1 (V
IN
) and TP2 (GND). A voltmeter
between 0 V and 5 V for output voltage measurement at TP6 (V
OUT
) and TP8 (GND). A current meter between 0
is used for input current measurements.
7.1.3 Output Load
The output load should be an electronic constant resistance mode load capable of between 0 A
DC
and 30 A
DC
at
1.2 V.
7.1.4 Oscilloscope
A digital or analog oscilloscope can be used to measure the output ripple. The oscilloscope should be set for the
following:
• 1-MΩ impedance
• 20-MHz bandwidth
• AC coupling
• 2-μs/division horizontal resolution
• 50-mV/division vertical resolution
Test points TP6 and TP8 can be used to measure the output ripple voltage. Place the oscilloscope probe tip
through TP6 and rest the ground barrel on TP8 as shown in
. Using a leaded ground connection may
induce additional noise due to the large ground loop.
TP8
TP6
Metal Ground Barrel
Probe Tip
Figure 7-1. Tip and Barrel Measurement for V
OUT
Ripple
7.1.5 Fan
Some of the components in this EVM may approach temperatures of 60°C during operating. A small fan capable
of 200–400 LFM is recommended to reduce component temperatures while the EVM is operating. The EVM
should not be probed while the fan is not running.
7.1.6 Recommended Wire Gauge
For V
IN
to J1 (12-V input), the recommended wire size is 1 × AWG #14 per input connection, with the total length
of wire less than four feet (2-feet input, 2-feet return). For J2 to LOAD, the minimum recommended wire size is 2
× AWG #14, with the total length of wire less than four feet (2-feet output, 2-feet return).
Test Setup
4
TPS51113 Buck Controller Evaluation Module User's Guide
SLUU359A – APRIL 2009 – REVISED FEBRUARY 2022
Copyright © 2022 Texas Instruments Incorporated
