JPS5482150A - Transistor protecting circuit - Google Patents
Transistor protecting circuitInfo
- Publication number
- JPS5482150A JPS5482150A JP14922377A JP14922377A JPS5482150A JP S5482150 A JPS5482150 A JP S5482150A JP 14922377 A JP14922377 A JP 14922377A JP 14922377 A JP14922377 A JP 14922377A JP S5482150 A JPS5482150 A JP S5482150A
- Authority
- JP
- Japan
- Prior art keywords
- current
- overcurrent
- protecting circuit
- resistance
- output
- 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
Links
Landscapes
- Amplifiers (AREA)
Abstract
PURPOSE: To ensure the steady and high-speed protective action with no consumption of the output current by limiting the signal at the control terminal of the output transistor based on the drain output of MOSFET.
CONSTITUTION: The protecting circuit comprieses n- and p- channel MOSFET. T6 and T7 plus resistance R8∼R11. At the same time, resistance R5 and R6 function as the current feedback resistance of output transistor Tr.T4 and T5 as well as the voltage converting means of T6 and T7. In case the overcurrent is going to flow to T4 due to the short circuit of load RL, T6 conducts with increase of the voltage drop of R5 to limit the base current of T4. As a result, both the collector and emitter current of T4 are limited, thus avoiding the overcurrent of T4. The current to start this limitation can be controlled by varying the voltage division ratio between R8 and R9. So is with the protecting circuit consisting of T7, R10 and R11 with prevention of the overcurrent.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14922377A JPS5482150A (en) | 1977-12-14 | 1977-12-14 | Transistor protecting circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14922377A JPS5482150A (en) | 1977-12-14 | 1977-12-14 | Transistor protecting circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5482150A true JPS5482150A (en) | 1979-06-30 |
Family
ID=15470542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14922377A Pending JPS5482150A (en) | 1977-12-14 | 1977-12-14 | Transistor protecting circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5482150A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06223567A (en) * | 1993-09-13 | 1994-08-12 | Hitachi Ltd | Semiconductor storage |
-
1977
- 1977-12-14 JP JP14922377A patent/JPS5482150A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06223567A (en) * | 1993-09-13 | 1994-08-12 | Hitachi Ltd | Semiconductor storage |
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