Conference paper
Determination of over current protection thresholds for class D audio amplifiers
Monolithic class-D audio amplifiers typically feature built-in over current protection circuitry that shuts down the amplifier in case of a short circuit on the output speaker terminals. To minimize cost, the threshold at which the device shuts down must be set just above the maximum current that can flow in the loudspeaker during normal operation.
The current required is determined by the complex loudspeaker impedance and properties of the music signals played. This work presents a statistical analysis of peak output currents when playing music on typical loudspeakers for home entertainment.
| Language: | English |
|---|---|
| Publisher: | IEEE |
| Year: | 2005 |
| Pages: | 125-128 |
| Proceedings: | 2005 IEEE 23rd NORCHIP Conference |
| ISBN: | 1424400643 and 9781424400645 |
| Types: | Conference paper |
| DOI: | 10.1109/NORCHP.2005.1597005 |
Circuits Demodulation Filters Impedance Instruments Loudspeakers Protection Pulse width modulation Switches Voltage audio-frequency amplifiers loudspeaker impedance monolithic class-D audio amplifier output speaker terminal over current protection threshold overcurrent protection peak output currents
