Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1996-12-11
1998-10-06
Wong, Peter S.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323351, G05F 140, G05B 2402
Patent
active
058182071
ABSTRACT:
A circuit for providing a regulated output voltage from a buck converter without directly monitoring the output voltage. The buck converter includes a switch having a first terminal coupled to a supply voltage and a second terminal coupled to a first terminal of an inductor and to a first terminal of a resistive divider. A second terminal of the inductor is coupled to a first capacitor for forming the output voltage across the first capacitor. A voltage formed by the resistive divider is applied to an inverting input of a transconductance amplifier, while a reference voltage is applied to a non-inverting input of the transconductance amplifier. An output of the transconductance amplifier is coupled to a second capacitor for forming an error signal across the second capacitor. The error signal is representative of a difference between the output voltage and a desired output voltage because an average of the voltage formed by the resistive divider is representative of the output voltage. The error signal is compared to a periodic ramp signal by a comparator for forming a switch control signal. Therefore, circuit regulates the output voltage in a feedback loop by monitoring a voltage on the first terminal of the inductor rather than directly monitoring the output voltage. When the circuit is implemented in an integrated circuit package, this results in a savings of one pin. In another aspect, a variable signal is added to, or replaces, the reference voltage such that the circuit functions as a power amplifier.
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Micro Linear Corporation
Vu Bao Q.
Wong Peter S.
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