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A BCD process - based power amplifier chip circuit design and layout to achieve

Author: YeFei
Tutor: LiPing
School: University of Electronic Science and Technology
Course: Microelectronics and Solid State Electronics
Keywords: Digital audio amplifier H-bridge power amplifier Pulse Width Modulation Level shift Overcurrent protection
CLC: TN722.75
Type: Master's thesis
Year: 2008
Downloads: 226
Quote: 0
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Abstract


The digitized wave of global field of audio and video as well as energy saving and environmental protection requirements of audio and video equipment, forcing people as soon as possible to research and development of efficient, energy-saving, digital audio power amplifier. For the reality of digital audio amplifier came into being, and the advantages of high efficiency, low distortion, low cost is increasingly becoming the mainstream of the sound field. Digital audio amplifier, high efficiency, low distortion, and the advantages of its post-switch power amplifier has a direct relationship. The conversion rate of the post-stage power amplifier circuit, transient response and dynamic range, phase shift, power conversion efficiency, ability to drive the load will directly affect the overall performance of the circuit, so the post-stage power amplifier circuit design is a digital audio amplifier system design an important part of one. H-bridge switching power amplifier, with the advantages of high efficiency, high power to become the mainstream of the post-switch power amplifier. In this paper, based on analysis of domestic and international digital audio amplifier and after class switching power amplifier status, using JAZZ's 0.5umBCD process, designed a wide power output range of a high-efficiency digital audio H-bridge power amplifier circuit. The circuit PWM (Pulse Width Modulation, Pulse Width Modulation) signal amplifier output compatible 4Ω 6Ω 8Ω speaker load, supply voltage range of 6V ~~ 16V maximum effective output power of 27W (4Ω load, 16V supply voltage) The maximum efficiency of 81% (8Ω load, 16V supply voltage), over-current, over-temperature, over-voltage protection function, and also has the status outputs to facilitate the testing of the circuit. This article is based on the Department of the audio amplifier project, the design of the power amplifier stage circuit has the following characteristics: (1) Wide supply voltage input range wide power output: This chip uses high and low voltage power supply, the logic circuit and the protection level circuit 3.3V Low-powered V DDL H-bridge output structure by 6V ~ 16V voltage source V of the POWER power supply, the power output range of the chip 2W (8Ω Load, 6V supply voltage) to 27W (4Ω load, 16V supply voltage). (2) high efficiency output: circuit has a high output efficiency, maximum efficiency of 81% (8Ω load, 16V supply voltage). (3) the various protection level circuit and convenience testability: the chip has overcurrent protection, overtemperature protection and overvoltage protection, overcurrent protection circuit design is different from the conventional overcurrent protection design, has a higher accuracy. Chip in a state of the output circuit can be variety of working conditions of the reaction chip, and easy test of the chip.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Basic electronic circuits > Amplification technology,the amplifier > Amplifier > Amplifiers: the role of sub- > Power amplifier
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