Invention Grant
- Patent Title: Switching regulator and semiconductor apparatus including the same
- Patent Title (中): 开关调节器和包括其的半导体装置
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Application No.: US12488694Application Date: 2009-06-22
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Publication No.: US08258765B2Publication Date: 2012-09-04
- Inventor: Junji Nishida
- Applicant: Junji Nishida
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Cooper & Dunham LLP
- Priority: JP2008-167147 20080626
- Main IPC: G05F1/573
- IPC: G05F1/573 ; G05F1/00
Abstract:
A switching regulator is disclosed that includes a switching element; an inductor; a rectifier element; an error amplifier circuit portion; a PWM pulse generating circuit portion; a current sensing circuit portion; an output voltage decrease detecting circuit portion; a current pulse generating circuit portion; a phase detecting circuit portion; a VFM pulse generating circuit portion; and a switching control circuit portion configured to generate a control signal based on a PWM signal or a VFM signal and to switch a control status of the switching element from a PWM control to a VFM control in accordance with a third signal output from the phase detecting circuit portion, and to switch the control status from the VFM control to the PWM control in accordance with a second signal output from the output voltage decrease detecting circuit portion.
Public/Granted literature
- US20090322298A1 SWITCHING REGULATOR AND SEMICONDUCTOR APPARATUS INCLUDING THE SAME Public/Granted day:2009-12-31
Information query
IPC分类:
