A buck converter is used to:Choose the best optionClear ResponseExactly double the voltage.Stabilize the voltageStep up the voltageStep down the voltage

To determine the primary function of a buck converter, we need to consider what it is designed to do:

1. Definition and Function: A buck converter is a type of DC-DC converter that is used to reduce the voltage from a higher level to a lower level.

2. Voltage Regulation: It is particularly known for stepping down voltage while maintaining efficiency.

3. Options Analysis:

   • Exactly double the voltage: This is characteristic of a boost converter, not a buck converter.
   • Stabilize the voltage: While buck converters can help stabilize voltage to some degree, their main function is to step down the voltage.
   • Step up the voltage: Again, this is a characteristic of boost converters.
   • Step down the voltage: This is the primary function of buck converters.

Conclusion

Based on this analysis, the best option is to Step down the voltage.