Datasheet
Table Of Contents
V = 50 mV / div (ac coupled)
OUT
Time = 100 µsec / div
I = 1 A / div
OUT
Load step = 1 - 3 A, slew rate = 0.167 A / µsec
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
1
0
1
00
1
000
1
0000
1
00000
1
000000
Frequency - Hz
Gain - dB
-180
-150
-120
-90
-60
-30
0
30
60
90
120
150
180
Phase - Degrees
Gain
Phase
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Test Setup and Results
2.5 Load Transients
Figure 5 shows the TPS54478EVM-037 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. TPS54478EVM-037 Transient Response
2.6 Loop Characteristics
Figure 6 shows the TPS54478EVM-037 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. TPS54478EVM-037 Loop Response
7
SLVU470–June 11 TPS54478EVM-037 4-A, SWIFT™ Regulator Evaluation Module
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