Oscillator circuit and power supply chip

Abstract

The invention discloses an oscillator circuit and a power supply chip. According to the oscillator circuit, an integrated circuit process of a high-voltage transistor is adopted, so that high-precision frequency reduction applied to the interior of a power supply chip is realized. The oscillator circuit comprises an input signal port, a reference signal port, a triangular wave signal port and a periodic square wave signal port, a square wave signal with the same period can be generated while the triangular wave signal is generated, and the square wave signal is provided for other modules of apower supply chip, so that the cost is reduced.

Description

technical field [0001] The present application relates to the technical field of power chips, in particular to an oscillator circuit and a power chip. Background technique [0002] Conventional power chips require periodic triangular wave and square wave signals when they work, and these signals are used to determine the switching cycle, down-frequency cycle and control digital signal logic of the power chip. Therefore, the generation circuit that generates these signals is the core circuit module inside the switching power supply chip. [0003] In the switching power supply integrated circuit chip, a periodic oscillator circuit is needed to determine the duty cycle and maximum duty cycle of the power supply chip. Conventional metal oxide semiconductor field effect transistor technology devices have large parasitic capacitance, and the devices are not completely isolated. If this type of oscillator circuit is applied to an application with a higher frequency, it will incre...

AI Technical Summary

Problems solved by technology

If this type of oscillator circuit is applied to higher frequency applications, it will increase the design difficulty and circuit scale, and will also increase the production cost

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