JPS6436109A - Power amplifier circuit - Google Patents
Power amplifier circuitInfo
- Publication number
- JPS6436109A JPS6436109A JP62191780A JP19178087A JPS6436109A JP S6436109 A JPS6436109 A JP S6436109A JP 62191780 A JP62191780 A JP 62191780A JP 19178087 A JP19178087 A JP 19178087A JP S6436109 A JPS6436109 A JP S6436109A
- Authority
- JP
- Japan
- Prior art keywords
- current
- voltage
- excess
- voltage division
- 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.)
- Pending
Links
Abstract
PURPOSE:To improve the reliability by connecting respectively a voltage division circuit to two current sensing resistors and giving its output to a base of a current limit transistor(TR) so as to prevent excess through-current. CONSTITUTION:The voltage dividing ratio of a voltage divider circuit comprising resistors 17, 18 is selected so that a value being the voltage division of a voltage drop across a current sensing resistor 11 is more than a base-emitter voltage when a TR 15 is turned on. Thus, the TR 15 is turned on when an excess through-current flows in the path of power supply 5 TR 6 TR 9 current sensing resistor 11 ground to bypass a base current of a drive TR 13 thereby preventing an excess current. The voltage division ratio of voltage division circuits 19, 20 is selected equal to that of voltage division circuits 17,18 and an excess through-current flowing to the current sensing resistor 12 is prevented by a TR 14.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62191780A JPS6436109A (en) | 1987-07-30 | 1987-07-30 | Power amplifier circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62191780A JPS6436109A (en) | 1987-07-30 | 1987-07-30 | Power amplifier circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6436109A true JPS6436109A (en) | 1989-02-07 |
Family
ID=16280413
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62191780A Pending JPS6436109A (en) | 1987-07-30 | 1987-07-30 | Power amplifier circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6436109A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0446945A2 (en) * | 1990-03-16 | 1991-09-18 | Kabushiki Kaisha Toshiba | Electronic equipment incorporating an integrated BTL circuit |
-
1987
- 1987-07-30 JP JP62191780A patent/JPS6436109A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0446945A2 (en) * | 1990-03-16 | 1991-09-18 | Kabushiki Kaisha Toshiba | Electronic equipment incorporating an integrated BTL circuit |
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