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Test Setup and Results www.ti.com
4 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54427 evaluation module. It also
includes test results typical for the evaluation module for efficiency, output load regulation, output line
regulation, load transient response, output voltage ripple, input voltage ripple, start-up, and switching
frequency.
4.1 Input/Output Connections
Table 4 shows the input/output connectors and test points of the TPS54427 evaluation module. Connect a
power supply capable of supplying 2 A to J1 through a pair of 20 AWG wires. Connect the load to J2
through a pair of 20 AWG wires. The maximum load current capability is 4 A. Minimize wire lengths to
reduce losses in the wires. Test point TP1 provides a place to monitor the input voltage, V
IN
, with TP2
providing a convenient ground reference. Use TP8 to monitor the output voltage, V
OUT
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 4 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 evaluation module enables the
output voltage.
4
TPS54427, 4-A, SWIFT™ Regulator— Evaluation Module SLVU579–December 2011
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