If desired, a current probe can be inserted in the EVM as shown in
to measure the output current. The
slot was sized to fit most current probes, such as the LeCroy
™
AP015 or CP031 current probes.
Figure 2-2. TPS7A57EVM-056 With Current Probe Attached
The user has three options for providing a DC load on the output of the TPS7A57. J17 can be used to place a
DC load that flows through the current sense path and use the IOUT loop to measure the current. The second
option is to use the R16, R17, R18, R19, and R20 footprints to place a DC load and use the IOUT loop to
measure this current. Alternatively, the J13 (VOUT) and J14 (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 occur 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 help 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 VIN_SNS1 and VOUT_SNS.
Setup
6
TPS7A57EVM-056 Evaluation Module
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