Control device of power supply converter and control method thereof

Abstract

The invention provides a control device of a power supply converter. The control device comprises a current source circuit, a sampling circuit, a signal processing circuit, a driving circuit and a common pin. The common pin is coupled to a resistor and a switch. The current source circuit is coupled to the common pin and is used to provide current which flows to the resistor through the common pin in a first period. The sampling circuit is coupled to the common pin and is used to sample signals of the common pin to generate a first sampling value and a second sampling value. The signal processing circuit is coupled to the sampling circuit and is used to compare the first sampling value and the second sampling value. The driving circuit is coupled to the common pin and is used to generate a driving signal to turn the switch on. When the first sampling value and the second sampling value are same or the gap is less than a predetermined value, the signal processing circuit sets the driving circuit to intermittently turn the switch on in a second period. The control device can enable a number of internal circuits to share the pin. The correct operation of the control device can be ensured, so as to control the power supply converter.

Description

technical field [0001] The invention relates to a control device, in particular to a control device of a power converter capable of reducing the number of packaging pins. Background technique [0002] With the advancement of science and technology, the volume of electronic equipment is becoming more and more compact, so that various electronic components must also be reduced in order to be accommodated in a limited space. As far as integrated circuit products are concerned, since integrated circuits often need to use many input and output pins (pins) to couple with other circuit elements, it is necessary to use a package with more pins and a larger volume, so that The area of ​​the chip (die) is often much smaller than the area of ​​the package, which not only wastes materials and causes environmental problems, but also makes the volume of integrated circuit products unable to be effectively reduced. [0003] In power converter applications such as AC-to-DC converters and D...

AI Technical Summary

Problems solved by technology

As far as integrated circuit products are concerned, since integrated circuits often need to use many input and output pins (pins) to couple with other circuit elements, it is necessary to use a package with more pins and a larger volume, so that The area of ​​the chip (die) is often much smaller than the area of ​​the package, which not only wastes materials and causes environmental problems, but also makes the volume of integrated circuit products unable to be effectively reduced

[0003] In power converter applications such as AC-to-DC converters and DC-to-DC converters, when the control device of the power converter is implemented in the form of an integrated circuit, the chip size is usually small, but due to the need for more chips The number of pins is coupled with other circuit components to set the power stage, receive feedback signals, and receive operating parameters. Therefore, it is often limited by the number of pins required and must use a larger package, making the product design limited flexibility

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