National Semiconductor Corporation

Frank DeStasi

Michael Eugene Broach

A system and a method are disclosed for controlling an error amplifier between control mode changes. An error amplifier comprises a first stage that comprises a first current source and a second stage that comprises a second current source and at least one compensation component that is connected to the first stage through a signal line. A buffer circuit is connected between the signal line and the at least one compensation component and a switch circuit is connected between the buffer circuit and the at least one compensation component. When switched in to the error amplifier the buffer circuit provides a value of current to the at least one compensation component that is larger than a value of current that is provided to the at least one compensation component from the signal line. This increases the slew rate of the error amplifier during a pulse frequency modulation control mode.

System and method for controlling an error amplifier between control mode changes

A system and method are disclosed for providing a low voltage bandgap reference circuit that provides a substantially constant output voltage over a range of values of temperature. For example, the bandgap reference circuit could be capable of providing output voltages that are as low as one hundred millivolts. Also, no special start-up circuitry may be required to initiate the operation of the bandgap reference circuit. The bandgap reference circuit could further require fewer transistors and fewer resistors than prior art bandgap reference circuits.

System and method for providing a low voltage bandgap reference circuit

A trim circuit that is operable to adjust (trim) a digital or analog output of another electronic circuit, e.g., a regulator, comparator, signal processor, and the like. The novel trim circuit includes two fuses that can be separately 'blown' or severed in such a way as to provide a relatively fixed 'high' or &#x201c;low&#x201d; output signal that can be employed to adjust/trim the digital or analog output of another electronic circuit. A first fuse is coupled to a high potential of the trim circuit and the second fuse is coupled to a low potential of the trim circuit. If the second fuse is blown/cut, the trim circuit provides a relatively fixed high output signal. Conversely, if the first fuse is blown/cut, the trim circuit provides a relatively fixed low output signal. The fuses typically operate as relatively low impedance current shunts until they are severed/cut.

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San Leandro, CA, United States of America

Frank DeStasi