Texas Instruments TPS54373EVM-237, Руководство пользователя, Страница: 16 / 36

Input/Output Connections
2-2
2.1 Input/Output Connections
The TPS54373EVM-237 has the following three input/output connectors: V
I
J1, V
O
J2 and PRECHG_IN J4. A diagram showing the connection points is
shown in Figure 2–1. A power supply capable of supplying 5 A is connected
to J1 through a pair of 20 AWG wires. The load is connected to J2 through a
pair of 20 AWG wires. The maximum load current capability is 3 A. Wire lengths
should be minimized to reduce losses in the wires. Test point TP7 provides a
place to easily connect an oscilloscope voltage probe to monitor the output
voltage. The TPS54373 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 TPS54373EVM-237 with an external power supply as the source for
V
I
, an additional bulk capacitor may be required, depending upon the output
impedance of the source and length of the hookup wires. The test results
presented were obtained using a 470
µ
F, 16-V additional 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.
Figure 2–1. Connection Diagram
Load
+
–
0 – 3A
CH1
Oscilloscope
3–6V, 5 A
Voltmeter
– +
3–6 V, 3 A
Voltmeter
– +
Optional Precharge
Connection
Power Supply
Power Supply
Optional Input
Capacitor
+ –