The present invention proposes a new structure for a
high input VRM. This structure is similar to a simple
buck converter and can simplify the 48V input VRM design. In this present invention, the interleaved
voltage regulator is provided. The interleaved
voltage regulator includes an integrated magnetic device for performing both
transformer and output
choke filter function, a first switch, a second switch, a third switch, and a fourth switch, wherein the integrated magnetic device includes a
transformer having a first primary winding, a second primary winding, a first secondary winding, and a second secondary winding, a first
choke filter having one end coupled to a first terminal of the first secondary winding, and a second
choke filter having one end coupled to a first terminal of the second secondary winding, and the other end of the second choke filter coupled to the other end of the first choke filter to form the output terminal of the isolated
voltage regulator. The first switch, the second switch, the first choke filter, and the first secondary winding form a
synchronous rectifier circuit. The third switch, the fourth switch, the second choke filter, and the second secondary winding form another
synchronous rectifier circuit.