JPS5765013A - Output protection circuit - Google Patents

Output protection circuit

Info

Publication number
JPS5765013A
JPS5765013A JP55141330A JP14133080A JPS5765013A JP S5765013 A JPS5765013 A JP S5765013A JP 55141330 A JP55141330 A JP 55141330A JP 14133080 A JP14133080 A JP 14133080A JP S5765013 A JPS5765013 A JP S5765013A
Authority
JP
Japan
Prior art keywords
collector
current
base
turn
output transistor
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.)
Pending
Application number
JP55141330A
Other languages
Japanese (ja)
Inventor
Kazuo Shiraishi
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP55141330A priority Critical patent/JPS5765013A/en
Publication of JPS5765013A publication Critical patent/JPS5765013A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

PURPOSE:To accurately protect the output transistor from over-current and short circuit current, by turning on/off a current with a collector output of an inverter circuit the base of which is connected to the base of an output transistor, for switching action. CONSTITUTION:If load terminals 18, 19 of an output transistor (TR) having a base 20, collector 14 and emitter 16, and a TR operated as an inverter having a collector 13 with common base and emitter 15 are in short circuit and in overload, an abnormal overcurrent flows to the collector 14 of a TR12, and A1/A2 (current of the collector 14) flows to the collector 13 with Miller effect. Thus, a voltage drop is produced across a resistor 11 to turn on a PNP TR6. Then, the TR6 turns on, a voltage drop is produced across a resistor 8 with the collector current of the TR6 to turn on NPN TR9. The minority charge of the base of the TR12 is momentarily flowed through the TR9 by this turning-off to turn off the TR12.
JP55141330A 1980-10-09 1980-10-09 Output protection circuit Pending JPS5765013A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55141330A JPS5765013A (en) 1980-10-09 1980-10-09 Output protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55141330A JPS5765013A (en) 1980-10-09 1980-10-09 Output protection circuit

Publications (1)

Publication Number Publication Date
JPS5765013A true JPS5765013A (en) 1982-04-20

Family

ID=15289429

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55141330A Pending JPS5765013A (en) 1980-10-09 1980-10-09 Output protection circuit

Country Status (1)

Country Link
JP (1) JPS5765013A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59122104A (en) * 1982-12-28 1984-07-14 Toshiba Corp Temperature compensating circuit and protecting circuit for power amplifier
JPS60153204A (en) * 1984-01-22 1985-08-12 Rohm Co Ltd Amplifier circuit
JPH01109907A (en) * 1987-10-23 1989-04-26 Matsushita Electric Ind Co Ltd Amplifier

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5229584A (en) * 1975-08-29 1977-03-05 Hitachi Ltd Back up control system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5229584A (en) * 1975-08-29 1977-03-05 Hitachi Ltd Back up control system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59122104A (en) * 1982-12-28 1984-07-14 Toshiba Corp Temperature compensating circuit and protecting circuit for power amplifier
JPS60153204A (en) * 1984-01-22 1985-08-12 Rohm Co Ltd Amplifier circuit
JPH0318763B2 (en) * 1984-01-22 1991-03-13 Rohm Kk
JPH01109907A (en) * 1987-10-23 1989-04-26 Matsushita Electric Ind Co Ltd Amplifier

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