Low side line driver

Details Low side line driver Low side line driver

1994-09-12

1998-02-10

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 90, 327377, H02H 700

Patent

active

057175578

ABSTRACT:
A low side line driver (10) includes a slew rate limiter (12) providing current to a pre-charge reference circuit (16). The pre-charge reference circuit (16) generates a constant voltage at the input of a pre-drive circuit (18). Upon a transition to the active state, the pre-charge reference circuit (16) is disabled and current from the slew rate limiter (12) flows to pre-drive circuit (18) which becomes enabled without undue propagation delay or high instantaneous slew rate due to the pre-charge voltage generated by the pre-charge reference circuit (16) before turn on. The pre-drive circuit (18) provides base current to an output driver (22) from a negative voltage created in a charge pump (28). At turn off, an active turn off circuit (26) produces a short output pulse causing rapid discharge of base capacitance of the output driver (22) in order to minimize turn off propagation delay.

REFERENCES:
patent: 4158866 (1979-06-01), Baker
patent: 4593206 (1986-06-01), Neidorff et al.
patent: 4843260 (1989-06-01), Lacy
patent: 4980576 (1990-12-01), Rossi et al.
patent: 5119263 (1992-06-01), Gariboldi
patent: 5184034 (1993-02-01), Ohannes et al.

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