Datasheet

Load Transients
2-5
Test Setup and Results
2.5 Load Transients
The TPS54314EVM response to load transients is shown in Figure 2–6. The
load transient in Figure 2–6 transitions between 0 A and 3 A. The output
voltage deviates approximately –60 mV (–3.3%) and 70 mV (3.9%) from its
average value as a result of these transients. In Figure 2–6, the output voltage
returns to a ±2% regulation band within 30 µs.
Figure 2–6. Measured Load Transient Response
V
I
= 5 V
10 µs/div
V
O
= (AC)
50 mV/div
I
O
2 A/div
2.6 Loop Characteristics
The loop gain and phase for a 5-V input and a 3-A load is shown in Figure 2–7.
The loop crossover frequency is approximately 70 kHz, and the phase margin
is approximately 49°.
Figure 2–7. Measured Loop Gain and Phase
–30
–15
0
15
30
45
60
100 1 k 10 k 100 k 1 M
–90
–45
0
45
90
135
180
Phase
Gain
Gain – dB
f – Frequency – Hz
Phase – Degrees
T
A
= 25°C
V
I
= 5 V