| US 7,492,135 B2 | ||
| Switching converter | ||
| Mitsuo Saeki, Kawasaki (Japan); Kouichi Matsuda, Kawasaki (Japan); and Shigeaki Nakazawa, Kawasaki (Japan) | ||
| Assigned to Fujitsu Limited, Kawasaki (Japan) | ||
| Filed on Mar. 17, 2006, as Appl. No. 11/377,213. | ||
| Application 11/377213 is a continuation in part of application No. 11/239364, filed on Sep. 30, 2005, abandoned. | ||
| Claims priority of application No. 2005-080640 (JP), filed on Mar. 18, 2005; and application No. 2006-051018 (JP), filed on Feb. 27, 2006. | ||
| Prior Publication US 2006/0208715 A1, Sep. 21, 2006 | ||
| Int. Cl. G05F 1/59 (2006.01); G05F 1/618 (2006.01) | ||
| U.S. Cl. 323—271 [323/246; 323/285] | 16 Claims |
| 1. A control circuit of a switching converter for converting an input electric power to an output electric power by setting
a first switch and a plurality of second switches alternately to an ON-state, the control circuit including:
a first driving unit driving the first switch;
a plurality of second driving units for respectively driving the plurality of second switches; and
a selection unit receiving a load current value and pulse width modulated signals from a comparator and stopping part or the
whole of the plurality of second driving units based on said load current value.
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