Datasheet

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4.1 Input/Output Connections
The TPS54228EVM-686 is provided with input/output connectors and test points as shown in Table 4. A
power supply capable of supplying 2 A must be connected to J1 through a pair of 20 AWG wires. The load
must be connected to J2 through a pair of 20 AWG wires. The maximum load current capability is 2 A.
Wire lengths must be minimized to reduce losses in the wires. Test point TP1 provides a place to monitor
the input voltages (V
IN
) with TP2 providing a convenient ground reference. TP8 is used to monitor the
output voltage with TP9 as the ground reference.
Table 4. Connection and Test Points
Reference Designator Function
J1 V
IN
(see Table 1 for V
IN
range)
J2 V
OUT
, 1.05 V at 3 A maximum.
JP1 EN control. Connect EN to OFF to disable, connect EN to ON to enable.
TP1 V
IN
test point at V
IN
connector.
TP2 GND test point at V
IN
.
TP3 EN test point.
TP4 Loop response measurement test point.
TP5 VREG5 test point.
TP6 Switch node test point.
TP7 Analog ground test point.
TP8 Output voltage test point.
TP9 Ground test point at output connector.
4.2 Start-Up Procedure
1. Ensure that the jumper at JP1 (Enable control) is set from EN to OFF.
2. Apply appropriate V
IN
voltage to VIN and PGND terminals at J1.
3. Move the jumper at JP1 (Enable control) to cover EN and ON. The EVM enables the output voltage.
4
TPS54228EVM-686, 2-A, SWIFT™ Regulator Evaluation Module SLVU452– May 2011
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