公开(公告)号：EP3005012A1

公开(公告)日：2016-04-13

申请号：EP14804381.3

申请日：2014-05-28

申请人： Texas Instruments Incorporated

发明人： TORRES, Hector ,  PARKHURST, Charles

IPC分类号： G05F1/10 ,  G05F1/56 ,  G05F1/575

CPC分类号： H02H9/02 ,  G05F1/5735 ,  G05F1/575 ,  H02H9/001

摘要： Apparatus disclosed herein implement a fast transient precision current limiter such as may be included in an electronic voltage regulator. The current limiter includes two current sense element/current clamp control loops. A fast response time control loop first engages and clamps a current spike. A precision control loop then engages to more accurately clamp the output current to a programmed set point. The precision clamping loop includes an inner loop to linearize the precision current sense element. The inner loop forces the drain-to-source voltage (VDS) of the precision sense element to track the VDS of the regulator pass element. A more precise clamping operation results. Overall speed is not sacrificed as the fast response time clamping loop operates in parallel to protect circuitry while the precision clamping loop engages.