Datasheet

2.5 Load Transients
Vout=50mV/div(accoupled)
Iout=1 A /div(1 A to3 A loadstep)
Time=600 μsec/div
2.6 Loop Characteristics
-60
-50
-10
0
10
20
30
40
50
60
100 1k 10k 100k 1M
Frequency(f)-Hz
Gain-dB
-120
-30
0
60
90
180
Phase(°)-deg
-20
-30
-40
-180
-150
-90
-60
30
120
150
Gain
Phase
www.ti.com Test Setup and Results
Figure 5 shows the TPS54318EVM-375 response to load transients. The current step is from 25% to 75%
of maximum rated load at 3.3 V input. Total peak-to-peak voltage variation is as shown, including ripple
and noise on the output.
Figure 5. TPS54418EVM-375 Transient Response
Figure 6 shows the TPS54418EVM-375 loop-response characteristics. Gain and phase plots are shown
for V
IN
voltage of 3.3 V. Load current for the measurement is 4 A.
Figure 6. TPS54418EVM-375 Loop Response
SLVU280 – May 2009 TPS54418EVM-375 4-A, SWIFT™ Regulator Evaluation Module 7
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