Semiconductor device for controlling switching power supply

Details Semiconductor device for controlling switching power supply Semiconductor device for controlling switching power supply

2009-04-10

2011-12-27

Riley, Shawn (Department: 2838)

Electrical transmission or interconnection systems

Switching systems

Condition responsive

C363S049000

Reexamination Certificate

active

08084893

ABSTRACT:
A semiconductor device controls a switching power supply. The semiconductor device includes a current inflow terminal; a starter circuit to cause a starting current to flow from the current inflow terminal to a power supply terminal to charge a capacitor externally connected to the power supply terminal; a control unit which controls the starter circuit to turn on to charge the capacitor with the starting current and controls the starter circuit to turn off to perform brown-out detection; a comparator which detects a brown-out state while the starter circuit is turned off; and a brown-out detection unit which receives output signals from the comparator and the control unit as inputs. The brown-out detection is performed while the starter circuit is off, so that the current inflow terminal for the starter circuit is used in common as a voltage detection terminal for detection of the brown-out state.

REFERENCES:
patent: 7495875 (2009-02-01), Lin
patent: 7723972 (2010-05-01), Balogh
patent: 2001-258249 (2001-09-01), None
patent: 2006-014465 (2006-01-01), None
patent: 2006-204082 (2006-08-01), None
patent: 2006-304485 (2006-11-01), None

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