Texas Instruments TPS54973EVM-017, User Manual, Page: 16 / 34

Input/Output Connections
2-2
2.1 Input/Output Connections
The TPS54973EVM−017 has the following three input/output connectors: VIN
J2, VOUT J1, and PRECHG_IN J4. A diagram showing the connection points
is shown in Figure 2−1. A power supply capable of supplying 8 A should be
connected to J2 through a pair of 20 AWG wires. The load should be connected
to J1 through a pair of 20 AWG wires. The maximum load current capability
should be 9 A. Wire lengths should be minimized to reduce losses in the wires.
Test point TP1 provides a place to easily connect an oscilloscope voltage
probe to monitor the output voltage. The TPS54973 is intended to be used as
a point of load regulator. In typical applications it is usually located close to the
input voltage source. When using the TPS54973EVM−017 with an external
power supply as the source for VIN, an additional bulk capacitor may be
required, depending upon the output impedance of the source and length of
the hook-up wires. The test results presented were obtained using an
additional 470-
µ
F, 16-V input capacitor. Alternately, C1 may be populated with
an input filter capacitor. Connection is shown for no precharge only. To utilize
the precharge feature, connect the optional power supply to the J4 connector
or connect the input voltage to the series diode array by inserting a jumper
across the J3 header.