SYNCHRONIZED TEMPERATURE PROTECTION FOR CLASS-AB AMPLIFIERS

摘要

The present invention relates to a synchronization circuit for an integrated amplifier provided with a bandwidth control in accordance to a bandwidth control signal, wherein said synchronization circuit comprises a control terminal for a control signal and rank selector means connected to an internal control signal and being configured to emboss said internal control signal to said control terminal, if said internal control signal has a higher rank in accordance to a predetermined ranking criteria in comparison to said control signal. Further, the present invention relates to a respective synchronization method for continuously communicating and synchronizing of a common control signal for multiple circuits. One preferred application of the invention is in temperature protection by a synchronized bandwidth control for multiple class- AB amplifiers by means of only one additional terminal pin per amplifier. In such multi-channel amplifier configuration, the hottest amplifier dictates the amount of bandwidth reduction. By the invention the individual amplifiers can communicate about their individual temperatures, by which the temperature of the actual hottest amplifier and the respective required bandwidth reduction is determined and provided to each individual amplifier for a synchronized bandwidth reduction. Thus, in three channel RGB-amplifiers the signal integrity is advantageously maintained.