Datasheet

C4: V
OUT
AC coupled (100 mV/div)
C3: I
OUT
(1.00 A/div)
Timebase: 200 µs/div
10 100 1k 10k 100k 1M
−60
−40
−20
0
20
40
60
−180
−120
−60
0
60
120
180
Frequency (Hz)
Gain (dB)
Phase (°)
Gain
Phase
Iout = 2.5 A
Vin = 12 V
G006
Test Setup and Results www.ti.com
4.4 Load Transient and Loop Response
Figure 5 show the TPS55340EVM-148 response to load transients. The current step is from 25% to 75%
of maximum rated load at V
IN
= 12V. 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.
Figure 6 shows the TPS55340EVM-148 loop-response characteristics. Gain and phase plots are shown
for V
IN
voltage of 12V with load current of 2.5A. The loop-response measurement is taken by replacing R3
with a 49.9-Ω resistor. The signal is then injected across it with test points TP2 and TP6.
Figure 5. Load Transient Response Figure 6. Loop Response
6
TPS55340EVM-148, 8V to 24V Input, 5V Output Flyback Evaluation Module SLVU751A–July 2012–Revised June 2013
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