Oscillator circuit and power supply chip

A technology of oscillators and circuits, applied in the field of power chips, can solve the problems of increasing design difficulty, circuit scale, and increasing production costs, and achieve good anti-interference ability, low production costs, and cost reduction effects

Active Publication Date: 2020-11-20
SHANGHAI XINLONG SEMICON TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If this type of oscillator circuit is applied to higher frequency applications, it will in

Method used

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  • Oscillator circuit and power supply chip
  • Oscillator circuit and power supply chip
  • Oscillator circuit and power supply chip

Examples

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[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Apparently, the described embodiments are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of this application.

[0023] Specifically, see figure 1 As shown, in this embodiment provides an oscillator circuit 100 (such as image 3 marked). The oscillator circuit includes: a bias current module 110 , a triangular wave generator module 120 , an adjustable reference voltage module 140 , a comparator module 130 and a square wave generator module 150 .

[0024] Wherein, the bias current module 110 is used to provide a bias current. The triangular wave generator module 120 is connected to the b...

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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...

Claims

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Application Information

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IPC IPC(8): H03K3/02G05F3/26
CPCG05F3/262H03K3/02
Inventor 李瑞平池伟刘彬王建虎
Owner SHANGHAI XINLONG SEMICON TECH CO LTD
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