Texas Instruments TPS40190EVM-001, Руководство пользователя

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4 Test Setup
4.1 Equipment
4.1.1 Voltage Source (V
12V_IN
)
The input voltage source (V12V_IN) should be a 0-V to 15-V variable DC source capable of 5 A
DC
. Connect
V12V_IN to J1 as shown in Table 3-2 .
4.1.2 Meters
• A1: 0 A
DC
to 5 A
DC
, ammeter
• V1: V
12_IN
, 0-V to 15-V voltmeter
• V2: V
1V5_OUT
, 0-V to 5-V voltmeter
4.1.3 Loads (LOAD1)
The output load (LOAD1) should be an electronic constant current mode load capable of 0-A
DC
to 15 A
DC
at 1.5
V.
4.1.4 Oscilloscope
A digital or analog oscilloscope can be used to measure the ripple voltage on VOUT. The oscilloscope should be
set for the following to take output ripple measurements:
• 1-MW impedance
• 20-MHz bandwidth
• AC coupling
• 1-ms/division horizontal resolution
• 20-mV/division vertical resolution
TP 9 and TP 10 can be used to measure the output ripple voltage by placing the oscilloscope probe tip through
TP 9 and holding the ground barrel to TP 10 as shown in
Figure 4-1 . For a hands-free approach, the loop in TP
10 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
V
12V_IN
to J1
The connection between the source voltage, V12V_IN, and J1 of the TPS40190EVM-001 can carry as much as
3 A
DC
. The minimum recommended wire size is AWG #16 with the total length of wire less than four feet (2-feet
input, 2-feet return).
J2 to LOAD1 (Power)
The power connection between J2 of TPS40190EVM-001 and LOAD1 can carry as much as 15 A
DC
. The
minimum recommended wire size is 2× AWG #16, with the total length of wire less than four feet (2-feet output,
2-feet 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 required 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.
4.2 Equipment Setup
Figure 4-1 is the basic test setup recommended to evaluate the TPS40190EVM-001. Please note that although
the return for J1 and J2 are the same, the connections should remain separate as shown in Figure 4-1 .
www.ti.com Test Setup
SLUU232A – SEPTEMBER 2005 – REVISED JANUARY 2022
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