Title:
SEMICONDUCTOR DEVICE
Document Type and Number:
Japanese Patent JP2016119700
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a DCDC converter which achieves optimal power efficiency independent from power consumption of a load circuit; and provide a control circuit having a large variable width of a sampling frequency.SOLUTION: A control circuit includes a triangular wave generating circuit having a current generation circuit which has a plurality of stages of current mirrors connected in parallel and which is arranged in such a manner that a total current of output currents from the plurality of stages of current mirrors becomes an output current of the current generation circuit. Further, to each current mirror, a switching element for controlling ON/OFF of a current depending on a magnitude of load current of a DCDC converter is connected.SELECTED DRAWING: Figure 3
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Inventors:
ITO YOSHIAKI
Application Number:
JP2016021443A
Publication Date:
June 30, 2016
Filing Date:
February 08, 2016
Export Citation:
Assignee:
SEMICONDUCTOR ENERGY LAB CO LTD
International Classes:
H03K4/06; H02M3/155
Domestic Patent References:
| JP2004282714A | 2004-10-07 | |||
| JP2001112251A | 2001-04-20 | |||
| JP2000013204A | 2000-01-14 | |||
| JP2008066970A | 2008-03-21 | |||
| JPH0348506A | 1991-03-01 |