Low voltage current limit loop

Details Low voltage current limit loop Low voltage current limit loop

1987-10-28

1989-07-25

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 93, 361 91, 307570, 307249, 323277, 323278, H02H 300

Patent

active

048519537

ABSTRACT:
A current limit circuit is provided which may be used to limit the current conducted by a pass transistor in a low dropout voltage regulator circuit having no ground terminal. The output current of the regulator is sensed by a low value resistor in the collector of the transistor. The voltage developed across the resistor is proportional to the output current of the regulator, and is used to vary a current ratio which sets the current limit value. The gain of the current limit loop is increased by providing positive feedback during current limiting. A foldback network is provided which reduces the current limit value at higher input/output voltage differentials. The feedback provided by the foldback network has a breakpoint which is sensitive to the operating temperature of the regulator circuit.

REFERENCES:
patent: 3796943 (1974-03-01), Nelson et al.
patent: 3843933 (1974-10-01), Ahmed
patent: 4176308 (1979-11-01), Dobkin et al.
patent: 4564879 (1986-01-01), Bienstman
patent: 4638396 (1987-01-01), Mukli et al.
patent: 4680664 (1987-07-01), Leuthen

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