JPS6230411U - - Google Patents

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Publication number
JPS6230411U
JPS6230411U JP12181285U JP12181285U JPS6230411U JP S6230411 U JPS6230411 U JP S6230411U JP 12181285 U JP12181285 U JP 12181285U JP 12181285 U JP12181285 U JP 12181285U JP S6230411 U JPS6230411 U JP S6230411U
Authority
JP
Japan
Prior art keywords
transistor
protection
output
base
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.)
Granted
Application number
JP12181285U
Other languages
Japanese (ja)
Other versions
JPH071857Y2 (en
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 filed Critical
Priority to JP1985121812U priority Critical patent/JPH071857Y2/en
Publication of JPS6230411U publication Critical patent/JPS6230411U/ja
Application granted granted Critical
Publication of JPH071857Y2 publication Critical patent/JPH071857Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Amplifiers (AREA)

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は、本考案の一実施例を示す回路図、及
び第２図は従来の出力トランジスタの保護回路を
示す回路図である。 主な図番の説明、１０，１２……駆動トランジ
スタ、１１，１３……出力トランジスタ、２１…
…保護トランジスタ、２２……帰還トランジスタ
、２３……複数のダイオード、２４……ミラーダ
イオード。 FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a circuit diagram showing a conventional output transistor protection circuit. Explanation of main drawing numbers, 10, 12...drive transistor, 11, 13...output transistor, 21...
...protection transistor, 22...feedback transistor, 23...multiple diodes, 24...mirror diode.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] プツシユプル接続された出力トランジスタを破
壊から保護する為の出力トランジスタの保護回路
であつて、エミツタが出力中点に接続された複数
のコレクタを有する保護トランジスタと、該保護
トランジスタの第１コレクタとベースとの間の正
帰還路を構成する帰還トランジスタと、前記出力
トランジスタを駆動する前置駆動トランジスタの
コレクタと前記保護トランジスタのベースとの間
に直列接続された複数のダイオードと、前記保護
トランジスタのベースと前記出力中点との間に挿
入され、前記保護トランジスタと電流ミラー関係
に接続されたミラーダイオードとから成り、前記
出力トランジスタに過大電流が流れ、前記出力ト
ランジスタのベース・エミツタ間電圧が増大した
とき前記保護トランジスタを導通させ、該保護ト
ランジスタの第２コレクタにより前記出力トラン
ジスタのベース電流を遮断する様にしたことを特
徴とする出力トランジスタの保護回路。 A protection circuit for an output transistor for protecting a push-pull connected output transistor from destruction, the protection transistor having a plurality of collectors whose emitters are connected to an output midpoint, and a first collector and a base of the protection transistor. a plurality of diodes connected in series between the collector of a pre-drive transistor that drives the output transistor and the base of the protection transistor; A mirror diode is inserted between the output midpoint and connected to the protection transistor in a current mirror relationship, and when an excessive current flows through the output transistor and the base-emitter voltage of the output transistor increases. A protection circuit for an output transistor, characterized in that the protection transistor is made conductive, and a second collector of the protection transistor cuts off a base current of the output transistor.
JP1985121812U 1985-08-08 1985-08-08 Output transistor protection circuit Expired - Lifetime JPH071857Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1985121812U JPH071857Y2 (en) 1985-08-08 1985-08-08 Output transistor protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1985121812U JPH071857Y2 (en) 1985-08-08 1985-08-08 Output transistor protection circuit

Publications (2)

Publication Number Publication Date
JPS6230411U true JPS6230411U (en) 1987-02-24
JPH071857Y2 JPH071857Y2 (en) 1995-01-18

Family

ID=31011426

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1985121812U Expired - Lifetime JPH071857Y2 (en) 1985-08-08 1985-08-08 Output transistor protection circuit

Country Status (1)

Country Link
JP (1) JPH071857Y2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010087692A (en) * 2008-09-30 2010-04-15 Sanyo Electric Co Ltd Btl amplifier protection circuit

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54103658A (en) * 1978-02-01 1979-08-15 Hitachi Ltd Protective circuit
JPS55128908A (en) * 1979-03-27 1980-10-06 Toshiba Corp Transistor protective circuit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54103658A (en) * 1978-02-01 1979-08-15 Hitachi Ltd Protective circuit
JPS55128908A (en) * 1979-03-27 1980-10-06 Toshiba Corp Transistor protective circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010087692A (en) * 2008-09-30 2010-04-15 Sanyo Electric Co Ltd Btl amplifier protection circuit

Also Published As

Publication number Publication date
JPH071857Y2 (en) 1995-01-18

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