A circuit for providing drive current to a coil of a motor uses a sensefet current sensing device having a sense node and a source node. The source node is connected to deliver current to the coil, wherein a "sense" current proportional to said delivered current is produced on the sense node. An amplifier is connected to sense a voltage between said sense and source nodes to produce an output voltage to force a voltage on the sense node to be the same as a voltage on the source node. A pass element is connected to route said "sense" current to an output node. The circuit produces an output that is suitable for use as a feedback signal in a motor control system. <IMAGE>
申请公布号
DE69309776(D1)
申请公布日期
1997.05.22
申请号
DE1993609776
申请日期
1993.05.19
申请人
SGS-THOMSON MICROELECTRONICS, INC., CARROLLTON, TEX., US
发明人
CAROBOLANTE, FRANCESCO, SAN JOSE, CALIFORNIA 95129, US