发明申请
- 专利标题: Method of optimum current blanking time implementation in current sense circuit
- 专利标题(中): 电流检测电路实现最佳电流消隐时间的方法
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申请号: US11986775申请日: 2007-11-26
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公开(公告)号: US20090134856A1公开(公告)日: 2009-05-28
- 发明人: Abidur Rahman , Huijuan Li , Brett E. Smith , Zheng Li
- 申请人: Abidur Rahman , Huijuan Li , Brett E. Smith , Zheng Li
- 申请人地址: US TX Dallas
- 专利权人: Texas Instruments Incorporated
- 当前专利权人: Texas Instruments Incorporated
- 当前专利权人地址: US TX Dallas
- 主分类号: G06F1/10
- IPC分类号: G06F1/10 ; G01R19/00
摘要:
In a method and system for sensing current in a switching regulator (SWR) operating in a current mode, a power switch is coupled to receive the current from a switching element, the power switch being controlled by a gate signal. An inrush of the current causes an initial transient spike (ITS). A buffer having a buffer input and a buffer output is coupled to receive the gate signal and provide a buffered gate signal. The buffer output is disabled during the ITS. A sense switch (SW) is coupled to receive a portion of the current from the switching element, the SW being turned on by the buffered gate signal after the initial transient spike. A sense resistor (SR) is coupled to receive the portion of the current from the SW. An amplifier converts the portion of the current through the SR to a voltage signal for controlling the SWR.
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