Texas Instruments TPS7A14EVM-058, Руководство пользователя, Страница: 5 / 17

If desired, a current probe can be inserted in the EVM as shown in Figure 2-2 to measure the input and output
current. The slots were sized to fit most current probes, such as the LeCroy ™ AP015 or CP031 current probes.
Figure 2-2. TPS7A14EVM-058 With Current Probes Attached
The user has two options for providing a DC load on the output of the TPS7A14. J10 can be used to place a
DC load that flows through the current sense path on the output of the LDO. Alternatively, the J4 (VOUT) and
J12 (GND) banana connectors can be used for external measurements and loading; however, the IOUT loop
does not sense current flowing through these connectors. In cases where very fast transient tests are performed,
ringing may be observed on VIN or VOUT as a result of the parasitic inductance within the PCB of the EVM. A
strip of wire placed on the exposed copper in the current path can reduce this ringing. Select the correct size of
additional wire to fill the volume of the current probe. For most current probes, a 10 AWG wire can be used.
WARNING
The sensors of some current probes are tied to GND and cannot come into contact with energized
conductors. See the user manual of your current probe for details. If your current probe has this
limitation, use a thin strip of electrical or Kapton
® tape to isolate the current sense path from the
current probe.
Optional kelvin sense points are provided using the SMA connectors J1 (VIN) and J2 (VOUT).
2.4 Optional Load Transient Circuit Operation
The TPS7A14EVM-058 evaluation module contains an optional high-performance load transient circuit to allow
efficient testing of the TPS7A14 LDO load transient performance. To use the optional load transient circuit, install
the correct components in accordance with the application. Modify the input and output capacitance connected
to the TPS7A14 LDO to match the expected operating conditions. Determine the desired peak current to test,
and modify the parallel resistor combination of R2, R3, R4, R5, and R6 as shown:
OUT
Peak
2 3 4 5 6
V
I
R R R R R
(1)
www.ti.com Setup
SBVU073 – NOVEMBER 2021
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