Datasheet

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Output Current (mA)
Frequency (kHz)
V
IN
= 12 V
V
IN
= 5.0 V
G000
V 100 mV/div (-0.85 V offset)
OUT
Time 100 µs/div
V = 12 V
IN
I 1 A/div
Load Step: 1 A to 3 A
Slew Rate: 1 A/µs
OUT
V 100 mV/div (-0.85 V offset)
OUT
Time 100 µs/div
V = 12 V
IN
I 1 A/div
Load Step: 0.01 A to 2 A
Slew Rate: 1 A/µs
OUT
www.ti.com Test Setup and Results
4.6 Frequency
The TPS54428 uses Eco-mode™ to increase the efficiency at light load. This means that the frequency is
getting lower for lower load conditions. Figure 5 shows the switching frequency of the part across the load
range.
Figure 5. TPS54428EVM-52 Frequency
4.7 Load Transient Response
The TPS54428EVM-052 response to load transient steps are shown in Figure 6 and Figure 7. Total
peak-to-peak voltage variation is as shown.
Figure 6. TPS54428EVM-052 Load Transient Figure 7. TPS54428EVM-052 Load Transient
Response, 1 A to 3 A Response, 0.01 A to 2 A
7
SLVU578–December 2011 TPS54428, 4-A, SWIFT™ Regulator Evaluation Module
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