Switching regulator and method for changing output voltages...

Details Switching regulator and method for changing output voltages... Switching regulator and method for changing output voltages...

2007-05-22

2007-05-22

Vu, Bao Q. (Department: 2838)

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

C323S282000, C323S284000

Reexamination Certificate

active

11115342

ABSTRACT:
A switching regulator including two switching elements and a control switching part. The two switching elements perform a switching operation according to a control signal to control an output voltage. One of the two switching elements is larger in ON-resistance and smaller in control electrode capacitance than the other. The control switching part performs PFM control over the one of the two switching elements to output a first predetermined voltage in a first operation mode, performs PWM control over the two switching elements to output a second predetermined voltage higher than the first predetermined voltage in a second operation mode, and switches the first operation mode to the second operation mode by performing the PFM control, changing the first predetermined voltage to the second predetermined voltage, and switching the PFM control to the PWM control after a first predetermined time elapses since start of increase in the output voltage.

REFERENCES:
patent: 5912552 (1999-06-01), Tateishi
patent: RE37609 (2002-03-01), Bittner
patent: 6396250 (2002-05-01), Bridge
patent: 6642697 (2003-11-01), Zuniga et al.
patent: 6933706 (2005-08-01), Shih
patent: 6940189 (2005-09-01), Gizara
patent: 7031174 (2006-04-01), Lipcsei
patent: 7061213 (2006-06-01), Yoshida
patent: 2002-300774 (2002-10-01), None

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