Electricity: power supply or regulation systems – Output level responsive
Patent
2000-02-01
2000-12-19
Riley, Shawn
Electricity: power supply or regulation systems
Output level responsive
323901, G05F 110, H02J 312
Patent
active
06163140&
ABSTRACT:
A start-up circuit for voltage regulators includes a depletion mode field effect transistor (FET) having a drain electrically coupled to an input voltage, a source electrically coupled to the voltage regulator power supply input terminal and to a voltage corresponding to an output voltage of the voltage regulator, a body at a fixed voltage, and a gate electrically coupled to the output of a comparator. At start-up, the voltage regulator is powered through the FET. The drain current is self-limiting, preventing the source of the FET from rising to the level of the input voltage. When the rising output voltage of the regulator reaches a level that can operate the regulator control circuit, the comparator grounds the gate of the FET to turn off the FET, and the voltage regulator operates off of its own output. Virtually no power is dissipated in the FET during steady-state operation of the regulator.
REFERENCES:
patent: 4236198 (1980-11-01), Ohsawa et al.
patent: 4644247 (1987-02-01), Burmenko
patent: 4686616 (1987-08-01), Williamson
patent: 4695936 (1987-09-01), Whittle
patent: 4890211 (1989-12-01), Telefus
patent: 5528132 (1996-06-01), Doluca
patent: 5546294 (1996-08-01), Schutten et al.
patent: 5568044 (1996-10-01), Bittner
patent: 5596465 (1997-01-01), Honda et al.
patent: 5666044 (1997-09-01), Tuozzolo
patent: 5694304 (1997-12-01), Telefus et al.
patent: 5801518 (1998-09-01), Ozaki et al.
IEEE, "Integration of High-Voltage NMOS Devices into a Submicron BiCMOS Process Using Simple Structural Changes," Yong Qiang Li et al., (1994), pp. 16.3.1-16.3.4.
Siliconix incorporated, 1988 Integrated Circuits Data Book, (1988) printed in U.S.A., pp. 10-35-10-42.
Chaney Steve I.
Cowell Andrew M.
Garnett Martin E.
Micrel Incorporated
Ogonowsky Brian D.
Riley Shawn
Schmidt Mark E.
Vu Bao Q.
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