Regulator circuit having over-current protection

Details Regulator circuit having over-current protection Regulator circuit having over-current protection

2011-04-12

2011-04-12

Behm, Harry (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C363S050000

Reexamination Certificate

active

07923978

ABSTRACT:
A stabilized regulator circuit is provided A first Pch transistor (PTr) (P1) whose source is connected to a power supply line and whose drain is connected to an output terminal that outputs a load current, a PTr (P2) whose source and gate are respectively connected to the source and gate of the PTr (P1), resistor elements connected in series between the output terminal and ground, a resistor element (R3) connected between a drain of P2and ground, and an amplifier which controls P1and P2based on a difference between potential of a connection point of the resistor elements and a reference. A comparator, with a differential amplifier input stage configured by an Nch transistor, compares potential difference between two ends of R3and potential difference between the connection point of the resistor elements and ground, and when the former is larger, controls P1so as to limit load current.

REFERENCES:
patent: 5512814 (1996-04-01), Allman
patent: 7183755 (2007-02-01), Itoh et al.
patent: 2006/0250740 (2006-11-01), Itoh et al.
patent: 2001-306163 (2001-11-01), None
Chinese Official Action-200810094933.6-Dec. 21, 2010.

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