Final answer:
The voltage ripple would increase if the switching frequency is increased to 200kHz in a buck converter.
Step-by-step explanation:
To determine the voltage ripple at a switching frequency of 200kHz, we can use the relationship between the output voltage ripple and the switching frequency in a buck converter. The voltage ripple is directly proportional to the switching frequency, so if the switching frequency is increased to 200kHz, the voltage ripple would also increase.
Let's assume that the original voltage ripple at 77kHz is 7.2%. If we increase the switching frequency to 200kHz, the voltage ripple would be higher than 7.2%.