Switching regulator including low-pass filter configured to...

Details Switching regulator including low-pass filter configured to... Switching regulator including low-pass filter configured to...

2008-10-22

2011-12-13

Sterrett, Jeffrey (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S282000, C323S351000

Reexamination Certificate

active

08076914

ABSTRACT:
A switching regulator includes a step-down-and-step-up unit to convert an input voltage to a low voltage or to a high voltage in accordance with a control signal, and a controller including a low-pass filter to receive a reference voltage generated in accordance with an external control signal. The controller causes the step-down-and-step-up unit to perform a step-down operation or a step-up operation in accordance with a voltage difference between a proportional voltage proportional to an output voltage of the step-down-and-step-up unit and the reference voltage. The controller further causes the step-down-and-step-up unit to perform a step-down operation or a step-up operation in accordance with a voltage difference between an output voltage of the low-pass filter and the proportional voltage, and changes a time constant of the low-pass filter in accordance with the operation being performed.

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