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Method of forming a power supply control and device therefor

一种电源控制器、控制器的技术，应用在电子学领域，能够解决输出电压大、PWM控制器产生可听噪音等问题

Active Publication Date: 2009-05-27
SEMICON COMPONENTS IND LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, burst mode usually results in a large ripple voltage in the output voltage
Despite operating in Burst Mode, the frequency of operation often results in audible noise from the PWM controller

Method used

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  • Method of forming a power supply control and device therefor
  • Method of forming a power supply control and device therefor
  • Method of forming a power supply control and device therefor

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Embodiment Construction

[0010] For simplicity and clarity of illustration, elements in these figures are not necessarily to scale, and like references in different figures represent like elements. Additionally, descriptions and details of well-known steps and elements are omitted for simplicity of the description. As used herein, a current-carrying electrode refers to an element of a device that carries current through the device, such as the source or drain of a MOS transistor, or the emitter or collector of a bipolar transistor or the cathode or anode of a diode, and A control electrode refers to an element of a device that controls the flow of current through the device, such as the gate of a MOS transistor or the base of a bipolar transistor. Although devices are illustrated herein as certain N-channel or P-channel devices, those skilled in the art will appreciate that complementary devices are also possible in accordance with the present invention.

[0011] FIG. 1 schematically illustrates an e...

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PUM

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Abstract

In one embodiment, a power supply controller has a variable frequency oscillator that is used for controlling a PWM controller. The power supply controller varies a frequency of the variable frequency oscillator.

Description

technical field [0001] The present invention relates generally to electronics, and more particularly to methods of forming semiconductor devices and structures. Background technique [0002] In the past, the semiconductor industry has utilized various methods and structures to form pulse width modulated (PWM) power supply controllers. An important characteristic of a PWM controller is efficiency. Many PWM power supply controllers change operating modes based on the amount of current required by the load. In some controllers, continuous conduction mode is used when the current required by the load is high, and burst mode is used when the current required by the load is low. However, burst mode typically results in large ripple voltages in the output voltage. Despite operating in Burst Mode, the operating frequency often causes the PWM controller to generate audible noise. Additionally, PWM controllers require complex logic to switch the PWM controller between two modes of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/527H02M5/297G05F1/40
CPCY02B70/16H02M2001/0032H02M3/156H02M1/0032Y02B70/10
Inventor 简国基梁德明
Owner SEMICON COMPONENTS IND LLC