Dual polarity voltage regulator circuits and methods for providi

Details Dual polarity voltage regulator circuits and methods for providi Dual polarity voltage regulator circuits and methods for providi

1995-06-07

1996-12-31

Sterrett, Jeffrey L.

Electricity: power supply or regulation systems

Output level responsive

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

323282, G05F 1575

Patent

active

055897614

ABSTRACT:
A dual polarity voltage regulator circuit that is capable of regulating either positive or negative voltages is disclosed. The regulator circuitry of the present invention provides dual polarity regulation while requiring only one additional pin over a single polarity regulator. The present invention utilizes a single error amplifier, a negative feedback network, and an overshoot recovery circuit in providing dual polarity regulation. One advantage of the negative feedback network of the present invention is that the regulator circuit uses the same error amplifier (i.e., only one error amplifier) to regulate both positive and negative input voltages. The negative feedback network actively affects signals input into the error amplifier during negative regulation, but is essentially disabled during positive regulation. Thus, positive and negative voltage regulation are provided using a single error amplifier that retains its multiple functions (for example, oscillator frequency shifting, overshoot improvement and loop frequency compensation).

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"LT1074/LT1076 Design Manual," Linear Technology Application Note 44, by C. Nelson, Linear Technology Corporation, Milpitas, California, Sep. 1991, pp. 1-48.

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