TP15
TP14
Metal Ground Barrel
Probe Tip
Test Setup
6
SNVU589 – December 2017
Copyright © 2017, Texas Instruments Incorporated
TPS53119EVM-690 User Guide
5
Test Setup
5.1
Test Equipment
Voltage Source:
The input voltage source V
IN
must be a 0-V to 14-V variable dc source capable of
supplying 10 Adc. Connect Vin to J4 as shown in
.
Multimeters:
V1: V
IN
at TP7 (Vin) and TP8 (GND).
V2: V
OUT
at TP14 (Vout) and TP15 (GND).
A1: Vin input current
Output Load:
The output load must be an electronic constant resistance mode load capable of 0 Adc to
30 Adc at 1.1 V.
Oscilloscope:
A digital or analog oscilloscope can be used to measure the output ripple. The oscilloscope
must be set for 1-M
Ω
impedance, 20-MHz bandwidth, ac coupling, 2-µs/division horizontal resolution, 50-
mV/division vertical resolution. Test points TP14 and TP15 can be used to measure the output ripple
voltage by placing the oscilloscope probe tip through TP14 and holding the ground barrel on TP15 as
shown in
. Using a leaded ground connection may induce additional noise due to the large ground
loop.
Figure 2. Tip and Barrel Measurement for Vout Ripple
Fan:
Some of the components of this EVM may approach temperatures of 60°C during operation. A small
fan capable of 200-400 LFM is recommended to reduce component temperatures while the EVM is
operating. The EVM must not be probed if the fan is not running.
Recommended Wire Gauge:
1. V
IN
to J4 (12-V input):
The recommended wire size is 1 × AWG 14 per input connection, with the total length of wire less than
4 feet (2-foot input, 2-foot return).
2. J5 to LOAD:
The minimum recommended wire size is 2 × AWG 14, with the total length of wire less than 4 feet (2-
foot output, 2-foot return)
