Datasheet

Test Setup and Results www.ti.com
Table 3 lists the R1 value for some common output voltages. For higher output voltages of 1.8 V or above,
a feedforward capacitor (C2) may be required to improve phase margin and is recommended for auto skip
Eco-mode™ stability. Pads for this component (C2) are provided on the printed-circuit board. Note that the
values given in Table 3 are standard values and not the exact value calculated using Table 3.
Table 3. Output Voltages
Output Voltage R1 R2 C2 L1
(V) (kΩ) (kΩ) (pF) (µH)
1.0 6.81 22.1 1.5
1.05 8.25 22.1 1.5
1.2 12.7 22.1 1.5
1.5 23.2 22.1 1.5
1.8 30.1 22.1 10 - 22 2.2
2.5 49.9 22.1 10 - 22 2.2
3.3 73.2 22.1 10 - 22 2.2
5.0 121 22.1 10 - 22 3.3
4 Test Setup and Results
This section describes how to properly connect, set up, and use the TPS54429EEVM-608. The section
also includes test results typical for the evaluation modules and 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
The TPS54429EEVM-608 is provided with input/output connectors and test points as shown in Table 4. A
power supply capable of supplying 3 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 4.5 A.
Wire lengths must be minimized to reduce losses in the wires. Test point TP1 provides a place to monitor
the V
IN
input voltages with TP2 providing a convenient ground reference. TP7 is used to monitor the output
voltage with TP8 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 4.5 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 Analog ground test point
TP5 Switch node test point
TP6 Power-good test point
TP7 Output voltage test point
TP8 Ground test point at output connector
4.2 Start-Up Procedure
1. Make sure the jumper at JP1 (Enable control) is set from EN to OFF.
2. Apply appropriate VIN 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
TPS54429EEVM-608, 4.5-A, SWIFT™ Regulator— Evaluation Module SLVU444–March 2011
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