Datasheet

Output Ripple Voltage
2-6
2.7 Output Ripple Voltage
The output ripple voltage is plotted in Figure 2–8 with an input voltage of 5 V
and a load current of 3 A. The TPS54314EVM has a typical output voltage
ripple of less than 20 mV
pp
. If the switching frequency is reduced, the output
ripple voltage is higher.
Figure 2–8. Measured Output Ripple Voltage
V
O
(AC)
10 mV/div
V
I
= 5 V
I
O
= 3 A
400 ns/div
2.8 Input Ripple Voltage
The input ripple voltage for a 3-A load is shown in Figure 2–9. With an input
voltage of 5 V, the input ripple is approximately 150 mV
pp
. The input ripple
voltage can be made lower by adding capacitance to the input.
Figure 2–9. Measured Input Ripple Voltage
V
I
(AC)
50 mV/div
V
I
= 5 V
I
O
= 3 A
400 ns/div