The audio frequency power amplifier with 40W to 60 W output power and formed by MOSFET

Published:2011/6/10 21:09:00 Author:leo | Keyword: The audio frequency power amplifier with 40W to 60 W output power and formed by MOSFET | From:SeekIC

The picture 1 shows a audio frequency power amplifier circuit diagram. It is made up of MOSFET with the output power of 40 to 160 W. In this circuit, the DC current feedback between power output stages to preamplifier stage is decided by the value of R1, while the AC current feedback is decided by the resistance value and capability of C1. The basic amplifying circuit is formed by series connecting the two stages differential amplifiers of VT1, VT2 and VT12 and VT13. The operating point of VT1 and VT2 is decided by constant current circuit VT3, while it is the same condition to VT12 and VT13. VT6, VT7, VT8 and thermistor RT form temperature protection circuit. VT14 forms the over current protection circuit. When the current value of output power MOSFET is stronger than the set value, VT14 is connected while VT12 and VT13 push the current to be weakless, and VT15 and VT16 is cut off. Therefore, all processes reach the final result of protecting the MOSFET.



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