Self-recovery and overcurrent protection circuit for power amplifier integrated circuit

Abstract

The invention discloses a design scheme of a self-recovery and overcurrent protection circuit for a digital power amplifier integrated circuit so as to realize an automatic power-off protection function during overcurrent of the power amplifier integrated circuit and an automatic detection and recovery function after overcurrent disappears. During normal operation of the power amplifier integrated circuit, if short circuit occurs between an output pin and a power line, between an output pin and a ground wire and between output pins, which leads to overcurrent, the circuit scheme can be adopted, on one hand, to timely turn off a power output device so as to prevent excessive current which leads to overburning of the integrated circuit. On the other hand, the scheme also can be adopted to timely recover output of the power amplifier circuit when the external short-circuit fault is removed. Thus, the defect that normal power output can be recovered only through integrated circuit reset in a traditional scheme can be avoided, and automatic detection and automatic recovery for overcurrent protection of the integrated circuit are realized.

Description

technical field [0001] The invention belongs to the technical field of integrated circuit design and can be used for over-current detection and power-off protection of small and medium power amplifier integrated circuits caused by short-circuit of output pins. Background technique [0002] Due to the high output power and large output current of the power amplifier integrated circuit, the short circuit between the output pin of the integrated circuit and the power line, the ground wire or the output pin may occur due to improper operation by the user during use. If any technical protection measures are added, the internal key components may be burned due to the excessive output current of the integrated circuit, which will greatly shorten the service life of the power integrated circuit. Therefore, power amplifier integrated circuits are generally designed to include an overcurrent protection circuit, which is mainly used to detect the occurrence of overcurrent in time and c...

AI Technical Summary

Problems solved by technology

There are many over-current detection and power-off schemes for early power amplifier integrated circuits, but a single over-current detection and shutdown current protection scheme has important shortcomings, that is, although it can meet the needs of over-current protection, after the occasional short-circuit event disappears, It is often necessary to reset the system to restore the normal operation of the integrated circuit, which makes the integrated circuit inconvenient to use

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