Texas Instruments TPS54973EVM-017, Руководство пользователя, Страница: 21 / 34

Load Transients
2-7 Test Setup and Results
2.5 Load Transients
The TPS54973EVM−017 response to load transients is shown in Figure 2−6.
The current step is from 25 to 75 percent of maximum rated load. Total
peak-to-peak voltage variation is as shown, including ripple and noise on the
output.
Figure 2−6. Load Transient Response, TPS54973
VO (ac) 50 mV/div
IO 2 A/div
t − Time − 200
µ
s/div
2.6 Loop Characteristics
The TPS54973EVM−017 loop response characteristics are shown in
Figure 2−7 and Figure 2−8. Gain and phase plots are shown for each device
at minimum and maximum operating voltage.
Figure 2−7.
Measured Loop Response, TPS54973, V
I
= 3 V
−60
−50
−40
−30
−20
−10
0
10
20
30
40
50
60
100 1 k 10 k 100 k 1 M
−180
−150
−120
−90
−60
−30
0
30
60
90
120
150
180
Phase
Gain
Gain − dB
f − Frequency − Hz
MEASURED LOOP RESPONSE
Phase − deg