Patent ID: 6166530
Filing Date: 2000-12-26
Classification: G05F,H03K

Abstract:
A current-limited switch comprising:a power MOSFET;a pilot circuit connected in parallel with the power MOSFET, a pilot MOSFET and a pilot resistor being connected in the pilot circuit;a reference circuit comprising a current source and current mirror circuitry, the current mirror circuitry comprising first and second parallel circuits, each parallel circuit comprising a current mirror MOSFET connected in parallel with a resistor, the first and second parallel circuits being connected in series;a difference amplifier having a first input terminal coupled to a point in the pilot circuit and a second terminal coupled to a point in the reference circuit, and having an output terminal coupled to a gate of the power MOSFET; anda current mirror compensation circuit comprising a first bypass switch for forming a short around the first parallel circuit when a voltage at a terminal of the power MOSFET reaches a first level.