Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2005-03-15
2005-03-15
Laxton, Gary L. (Department: 2838)
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
C323S274000, C323S315000, C361S018000
Reexamination Certificate
active
06867573
ABSTRACT:
An apparatus and method provide for temperature calibrating an over-current limit in a linear regulator. Output current is delivered to the load through a power pass device that is responsive to a gate control signal. A transistor circuit provides a sense current that is proportional to the output current. A diode device senses the operating temperature of the linear regulator. An analog-to-digital converter converts the sensed operating temperature to a digital quantity. A resistance value associated with a resistance circuit is changed in response to the digital quantity. The resistance circuit converts the sense current to a voltage that is compared to a reference voltage. An amplifier is arranged to adjust the gate control signal when the reference voltage is exceeded such that the over-current condition is detected.
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Hertzberg Brett A.
Laxton Gary L.
Merchant & Gould P,C,
National Semiconductor Corporation
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