Datasheet

Time = 4 ms/div
20 mV/div
10 V/div
V V offset
OUT
-3.3
V
IN
-60
-40
-20
0
20
60
10 100
Frequency - Hz
Gain - dB
40
-180
-120
-60
0
60
120
180
10000 100000 1000000
Phase - degree
1000
Phase
Gain
V = 12V,
= 3.5A
IN
OUT
V = 3.3V,
I
OUT
Time = 100 s/divm
100 mV/div
C3: V ac coupled
OUT
1 A/div
C4: I
OUT
C4
C3
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2.4 Load Transients and Loop Response
The EVM response to load transients is shown in Figure 8. The current step is from 25% to 75% of the
maximum rated load at 12-V input. The current step slew rate is 100 mA/µs. Total peak-to-peak voltage
variation is as shown, including ripple and noise on the output.
The EVM loop-response characteristics are shown in Figure 9. Gain and phase plots are shown for V
IN
voltage of 12 V. Load current for the measurement is 3.5 A.
Figure 8. Load Transient Response Figure 9. Loop Response
2.5 Line Transients
The EVM response to line transients is shown in Figure 10. The input voltage step is from 8.0 V to 40 V.
Total peak-to-peak voltage variation is as shown, including ripple and noise on the output.
Figure 10. Line Transient Response
7
SLVU794A–October 2012–Revised February 2013 Using the TPS54340 Step-Down Converter Evaluation Module
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