Invention Grant
- Patent Title: Hysteretic buck converter having dynamic thresholds
- Patent Title (中): 迟滞降压转换器具有动态阈值
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Application No.: US12145807Application Date: 2008-06-25
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Publication No.: US08008902B2Publication Date: 2011-08-30
- Inventor: John L. Melanson , Lei Ding
- Applicant: John L. Melanson , Lei Ding
- Applicant Address: US TX Austin
- Assignee: Cirrus Logic, Inc.
- Current Assignee: Cirrus Logic, Inc.
- Current Assignee Address: US TX Austin
- Agent Mitch Harris, Atty at Law, LLC; Andrew M. Harris
- Main IPC: G05F1/42
- IPC: G05F1/42
Abstract:
A hysteretic buck converter provides improved regulation control, in particular for buck converter standby operation. A comparison circuit compares the output voltage of the buck converter to a waveform that is generated from an indication of the output current of the converter, so that the turn-on time of the converter is advanced as the output current demand increases. The resulting action anticipates a reduction in output voltage due to the increased current, preventing an excursion of the output voltage below the ripple voltage minimum. The turn-off time of the converter is controlled by an upper threshold that limits the ripple voltage maximum. The output current indication may be a measurement of output current, or may be a dynamic value calculated from the input voltage and the output voltage waveform.
Public/Granted literature
- US20090322300A1 HYSTERETIC BUCK CONVERTER HAVING DYNAMIC THRESHOLDS Public/Granted day:2009-12-31
Information query
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