JPS5723308A - Protecting circuit for amplifying circuit - Google Patents

Protecting circuit for amplifying circuit

Info

Publication number
JPS5723308A
JPS5723308A JP9141580A JP9141580A JPS5723308A JP S5723308 A JPS5723308 A JP S5723308A JP 9141580 A JP9141580 A JP 9141580A JP 9141580 A JP9141580 A JP 9141580A JP S5723308 A JPS5723308 A JP S5723308A
Authority
JP
Japan
Prior art keywords
trq
circuit
turned
transistor
base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP9141580A
Other languages
Japanese (ja)
Other versions
JPS6059763B2 (en
Inventor
Yoshiaki Sano
Toshio Hanazawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP55091415A priority Critical patent/JPS6059763B2/en
Publication of JPS5723308A publication Critical patent/JPS5723308A/en
Publication of JPS6059763B2 publication Critical patent/JPS6059763B2/en
Expired legal-status Critical Current

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  • Amplifiers (AREA)

Abstract

PURPOSE: To prevent breakdown of an output transistor, by providing a switching means which conducts when an output terminal is grounded, between the base and the emitter of the first driving transistor which has been Darlington-connected.
CONSTITUTION: When an output terminal OUT is grounded, a transistor (TR) Q10 is turned off, a TRQ9 is turned on, and a TRQ8 is turned on. Accordingly, the base and the emitter of a TRQ5 which has been Darlington-connected are short- circuited, and an output TRQ6 is driven by a base bias current of the by-pass TRQ8 whose current value has been liminted by a current limiting resistance R6, therefore, its driving force is dropped.
COPYRIGHT: (C)1982,JPO&Japio
JP55091415A 1980-07-04 1980-07-04 Protection circuit for amplifier circuit Expired JPS6059763B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55091415A JPS6059763B2 (en) 1980-07-04 1980-07-04 Protection circuit for amplifier circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55091415A JPS6059763B2 (en) 1980-07-04 1980-07-04 Protection circuit for amplifier circuit

Publications (2)

Publication Number Publication Date
JPS5723308A true JPS5723308A (en) 1982-02-06
JPS6059763B2 JPS6059763B2 (en) 1985-12-26

Family

ID=14025738

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55091415A Expired JPS6059763B2 (en) 1980-07-04 1980-07-04 Protection circuit for amplifier circuit

Country Status (1)

Country Link
JP (1) JPS6059763B2 (en)

Also Published As

Publication number Publication date
JPS6059763B2 (en) 1985-12-26

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