Claims
- 1. A chopper-type regulator circuit for stabilizing an output voltage, comprising:
- a single-structure output transistor composed of a PNP-type transistor for switching an input current to a first output terminal; and
- a control section for controlling the switching of said output transistor between ON and OFF states based upon a voltage difference between a reference voltage and the output voltage, such that said control section controls a duty ratio of the output voltage,
- wherein said control section includes a base current output terminal for supplying a base current of said output transistor to a load connected to said chopper-type regulator circuit, the base current being supplied to the load whenever said output transistor is in an ON state.
- 2. The chopper-type regulator circuit as defined in claim 1, wherein said output transistor includes a collector, said collector being connected directly to said first output terminal.
- 3. The chopper-type regulator circuit as defined in claim 1, further comprising:
- a metal frame mounted with said regulator circuit, said first output terminal and said base current output terminal extending from said metal frame; and
- a packing resin for sealing said regulator circuit.
- 4. The chopper-type regulator circuit as defined in claim 1, wherein said control section controls a pulse width of a voltage mode.
- 5. The chopper-type regulator circuit as defined in claim 4, wherein said control section includes:
- a voltage difference output means for outputting a voltage difference between the reference voltage and the output voltage;
- a comparison means for comparing the output signal from said voltage difference output means with a prescribed pulse signal so as to output a control signal; and
- a constant current means for drawing the base current so as to keep a value of the base current constant when said output transistor is in conducting state based upon the control signal, said constant current means being connected between a base of said output transistor and said base current output terminal.
- 6. The chopper-type regulator circuit as defined in claim 1, wherein said control section controls a pulse width of a current mode.
- 7. The chopper-type regulator circuit as defined in claim 6, wherein said control section includes:
- a voltage difference output means for outputting a voltage difference between the reference voltage and the output voltage;
- a comparison means for comparing an output from said voltage difference output means with a current flow in said output transistor so as to output a first set signal;
- a flip flop for switching said output transistor based upon the first set signal and a prescribed second set signal; and
- a constant current means for drawing the base current so as to keep a value of the base current constant when said output transistor is brought to a conducting state by said switching operation via said flip flop, said constant current means being connected between a base of said output transistor and said base current output terminal.
- 8. The chopper-type regulator circuit as defined in claim 1, wherein said control section includes a first transistor having a collector and an emitter, said emitter being connected to a base of said output transistor, and said collector being connected directly to said base current output terminal.
- 9. The chopper-type regulator circuit as defined in claim 8, wherein said control section further includes a second transistor having a base connected to a base of said first transistor, said second transistor having an emitter connected to the base of the output transistor.
- 10. The chopper-type regulator circuit as defined in claim 1, further comprising a circuit element connected between said first output terminal and said base current output terminal.
- 11. The chopper-type regulator circuit as defined in claim 10, wherein said circuit element is a coil.
- 12. The chopper-type regulator circuit as defined in claim 1, wherein said output transistor and said control section are integrated into a single semiconductor chip.
- 13. The chopper-type regulator circuit as defined in claim 12, further comprising a metal frame mounted with said semiconductor chip, said first output terminal and said base current output terminal extending from said metal frame.
- 14. The chopper-type regulator circuit as defined in claim 12, further comprising a packing resin for sealing said semiconductor chip.
Priority Claims (2)
Number |
Date |
Country |
Kind |
6-293009 |
Nov 1994 |
JPX |
|
7-237985 |
Sep 1995 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/563,766 now U.S. Pat. No. 5,670,866, filed on Nov. 28, 1995, the entire contents of which are hereby incorporated by reference.
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Continuations (1)
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Number |
Date |
Country |
Parent |
563766 |
Nov 1995 |
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