Datasheet

2.5 Load Transients
t − Time − 5 s/divm
V OutputV
O
− oltage − 10mV/div
V =5V
I
V =1.8V
O
2.6 Loop Characteristics
-60dB
-40dB
-30dB
-20dB
-10dB
0dB
10dB
20dB
30dB
60dB
-180deg
-120deg
-90deg
-60deg
-30deg
0deg
30deg
60deg
90deg
120deg
180deg
1-Gain
1-Phase
Frequency
100kHz
Phase
1M
40dB
50dB
-50dB
100Hz 1kHz 10kHz
Gain
150deg
-150deg
Test Setup and Results www.ti.com
The TPS54617EVM-414 response to load transients is shown in Figure 4 . The current step (displayed at 2
A / div) is from 25% to 75% of maximum rated load (1.5 to 4.5 A) at 5 V input. Total peak-to-peak voltage
variation is as shown, including ripple and noise on the output.
Figure 4. TPS54617EVM-414 Transient Response
The TPS54617EVM-414 loop-response characteristics are shown in Figure 5 . Gain and phase plots are
shown for V
IN
voltage of 5 V. Load current for the measurement is 3 A.
Figure 5. TPS54617EVM-414 Loop Response
TPS54617EVM-414 6-A, SWIFT™ Regulator Evaluation Module6 SLVU279 – December 2008
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