JPH0427613U

JPH0427613U -

Info

Publication number: JPH0427613U
Application number: JP6900690U
Authority: JP
Priority date: 1990-06-28
Filing date: 1990-06-28
Publication date: 1992-03-05

Description

[Brief explanation of the drawing]

第１図はこの考案にかかる保護回路の一実施例
を示す要部の回路図、第２図は第１図に示す保護
回路の他の実施例の回路図、第３図は従来の保護
回路の一具体例を示すブロツクを含む回路図であ
る。ＶＣＣ……電源端子、Ｖ_０，Ｖ_０１，Ｖ_０２，
Ｖ_０３，Ｖ_０４……出力端子、ＧＮＤ……接地端
子、ＶＣＣ_２……第２電源ライン、Ｑ_０１，Ｑ_０
２……パワートランジスタ、Ｓ_１……スタンバイ
回路、ＳＷ……スイツチ回路、ＤＯＦＦ……オフ
ドライバ。 Fig. 1 is a circuit diagram of a main part showing one embodiment of the protection circuit according to this invention, Fig. 2 is a circuit diagram of another embodiment of the protection circuit shown in Fig. 1, and Fig. 3 is a conventional protection circuit. FIG. 2 is a circuit diagram including blocks showing a specific example. VCC...Power supply terminal, V ₀ , V ₀₁ , V ₀₂ ,
V ₀₃ , V ₀₄ ... Output terminal, GND ... Ground terminal, VCC ₂ ... Second power supply line, Q ₀₁ , Q _{0
2} ...power transistor, _S1 ...standby circuit, SW...switch circuit, DOFF...off driver.

Claims

[Scope of utility model registration request]

A protection circuit comprising: a switch circuit that detects the operating state of a standby circuit; and an off driver whose operation is controlled by the switch circuit and which opens and closes the operation of a power transistor.