Invention Grant
US07714558B2 Short circuit current ratcheting in switch mode DC/DC voltage regulators
有权
开关模式下的短路电流棘轮DC / DC稳压器
- Patent Title: Short circuit current ratcheting in switch mode DC/DC voltage regulators
- Patent Title (中): 开关模式下的短路电流棘轮DC / DC稳压器
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Application No.: US11216276Application Date: 2005-08-30
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Publication No.: US07714558B2Publication Date: 2010-05-11
- Inventor: Andrew Wu
- Applicant: Andrew Wu
- Applicant Address: US CA San Jose
- Assignee: Monolithic Power Systems, Inc.
- Current Assignee: Monolithic Power Systems, Inc.
- Current Assignee Address: US CA San Jose
- Agency: Perkins Coie LLP
- Main IPC: G05F1/00
- IPC: G05F1/00

Abstract:
In an embodiment, an apparatus is provided. The apparatus includes a high side pass device. The apparatus also includes a low side pass device coupled in series to the high side pass device. The apparatus further includes a control module coupled to the high side pass device and the low side pass device. The control module is coupled to the high side pass device and the low side pass device to control the high side pass device and the low side pass device.Additionally, the apparatus includes a first resistor coupled in series with the high side pass device and the low side pass device. Furthermore, the apparatus includes a first comparator coupled in parallel with the first resistor. The first comparator has a threshold voltage input differential corresponding to a first current limit, and an output of the first comparator is coupled to the control module. Moreover, the apparatus includes a second comparator coupled to sense current of the high side pass device as a voltage. The second comparator has a threshold voltage input differential corresponding to a second current limit. An output of the second comparator is coupled to the control module. The second current limit is higher than the first current limit. Also, the control module is operable to lock out the high side pass device responsive to the output of the first comparator until a reset signal is received and is operable to lock out the high side pass device responsive to the output of the second comparator until a low current signal is received.
Public/Granted literature
- US20060050449A1 Short circuit current ratcheting in switch mode DC/DC voltage regulators Public/Granted day:2006-03-09
Information query
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