Datasheet

Output and Input Voltage Ripple and Main Switching Waveforms
2-13
Test Setup and Results
2.8 Output and Input Voltage Ripple and Main Switching Waveforms
The TPS54x80EVM-228 evaluation module output and input voltage ripple
and main switching waveforms at V
I
= 3.3 V, V
O
= 1.8 V, I
O
= 6 A and
Fs = 700 kHz are shown in Figure 2-16. For these waveforms for the
TPS54680 regulator:
Ch.2: Input ripple 100 mV/div.
Ch.3: Output ripple 20 mV/div.
Ch.4: Phase pin 2 V/div.
Time: 1 µs/div
Figure 2-16. Input and Output Voltage Ripple and Main Switching Waveform at V
I
= 3.3 V
Figure 2-17 shows the output and input voltage ripple and main switching
waveforms of the core regulator TPS54680/TPS54880 and I/O regulator
TPS54610/TPS54810. The measurements are taken at V
I
= 5 V, V
O
= 1.8 V
(core), I
O
= 6 A (core), V
O
= 3.3 V (I/O), I
O
= 0 A (I/O) and Fs = 700 kHz for both
channels. For these waveforms:
Ch.2: Input ripple 100 mV/div.
Ch.3: Output ripple 20 mV/div.
Ch.4: Phase pin of TPS54680 (core) 5 V/div.
Ch.1: Phase pin of TPS54610 (I/O) 5 V/div.
Time: 1 µs/div