Integrated overcurrent protection system for class-D audio power amplifiers

A fully integrated overcurrent protection system is presented suitable for application in integrated class-D audio power amplifiers. Accurate overcurrent detection is used based on parallel measurement of the voltage drop across the DMOS power transistors. A logic circuit enables continuous current...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2005-11, Vol.40 (11), p.2237-2245
Main Author: Berkhout, M.
Format: Article
Language:English
Subjects:
Amplifiers
Applied sciences
Audio amplifiers
Circuit properties
Circuit testing
Circuits
Constraining
Current limiters
Digital circuits
Electric potential
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
High power amplifiers
Impedance
Loudspeakers
Other multijunction devices. Power transistors. Thyristors
Overcurrent
Power amplifiers
power FET amplifiers
Power system protection
Power transistors
Protection systems
Pulse amplifiers
pulse width modulation
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Short circuits
Switches
switching amplifiers
Transistors
Voltage drop
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Description
Summary:A fully integrated overcurrent protection system is presented suitable for application in integrated class-D audio power amplifiers. Accurate overcurrent detection is used based on parallel measurement of the voltage drop across the DMOS power transistors. A logic circuit enables continuous current limiting during overload situations. Actual short circuits can be distinguished from load impedance minima using a simple short-circuit discrimination method.
ISSN:0018-9200
1558-173X
DOI:10.1109/JSSC.2005.857369