Method and apparatus for power supply with fast transient response

摘要

An efficient power supply with fast transient response has been disclosed. In one implementation, two loops with different frequency responses are combined to provide an efficient, fast responding power supply.

主权项

1. A power supply comprising:
a primary regulator with a first frequency response and a first output; a secondary regulator with a faster frequency response than said first frequency response and a second output; wherein said second output is coupled in parallel with said first output through a capacitor to provide a combined output; wherein said primary regulator in a steady state provides all current at said combined output, and wherein said secondary regulator only provides a supplemental current to said combined output when a voltage at said combined output falls to a lower transient value; and wherein a voltage on said capacitor in steady state depends on at least in part on a voltage level at said combined output.