Texas Instruments Corporation

Joe A Devore

Ross Eliot Teggatz

Andrew Marshall

Kenneth G Buss

Dave Cotton

Bill Grose

A method and apparatus for programmable current limits is provided in which a plurality of current limit programmable cells (44 and 46) are programmed with a current limit. Output circuitry (14 and 16) which outputs current is limited by current limit circuitry (20, 24, 38, 40, and 42) when the output current reaches the programmed current limit.

Method and apparatus for programmable current limits

A slope control circuit having a plurality of resistive elements connected in parallel, each of the resistive elements including a control element for causing the associated resistive elements to be one of electrically conductive or electrically nonconductive, a delay circuit having a plurality of delay components coupled together in series, each of the delay components having a predetermined delay, the junction of each different adjacent pair of the delay components being coupled to the control element of a different one of the resistive elements and a load circuit coupled across the plurality of resistive elements. The circuit can further include a delay adjust circuit for adjusting the delay of each of the delay components, either initially or on-line. The resistance of each of the resistive elements can be the same or different. The plurality of resistive elements and the delay components are all disposed on a single semiconductor chip.

Digitally controlled output slope control/current limit in power

A method of efficiently turning off inductive loads includes turning off a driving switch, monitoring a circuit output during turn-off, and activating a control circuit in response to an inductive flyback voltage at the output which turns on a recirculation switch and recirculates residual load current and clamps the output thereby substantially decreasing power dissipation during inductive load turn-off.

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Dallas, TX, United States of America

Joe A Devore