DC/DC converter control circuits and DC/DC converter systems...

Details DC/DC converter control circuits and DC/DC converter systems... DC/DC converter control circuits and DC/DC converter systems...

2005-04-19

2005-04-19

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

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

C323S901000

Reexamination Certificate

active

06882133

ABSTRACT:
There are provided a DC/DC converter control circuit and a DC/DC converter system having high degree of freedom of mounting and achieving the following matters: (1) housing a DC/DC converter control circuit in a package miniaturized by reducing the number of terminals; and (2) starting-up a power saving mode in response to an input of an external control signal to a DC/DC converter system. A frequency setting terminal (RT) is connected to a resistance element RT and a switching section1in series, between the terminal and ground voltage. An external control signal CTL is inputted to the switching section1.When an external control signal CTL turns off the switching section1,connection to the ground voltage is opened and an oscillation driving section4does not operate. Thereby, power saving mode is kept. When the switching section1is turned on, connection to the ground voltage is closed and the oscillation driving section4starts up. Subsequently, a bias control section5starts up and bias condition toward the resistance element RT is controlled. Thereby oscillation frequencies approximate to a setting value. Control of power saving mode can be thus carried out without a dedicated terminal for an external control signal CTL.

REFERENCES:
patent: 5548206 (1996-08-01), Soo
patent: 11-041914 (1999-02-01), None

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