JPS57106915A - Constant current circuit - Google Patents

Constant current circuit

Info

Publication number
JPS57106915A
JPS57106915A JP18308080A JP18308080A JPS57106915A JP S57106915 A JPS57106915 A JP S57106915A JP 18308080 A JP18308080 A JP 18308080A JP 18308080 A JP18308080 A JP 18308080A JP S57106915 A JPS57106915 A JP S57106915A
Authority
JP
Japan
Prior art keywords
current
point
trq2
potential
voltage vcc
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
Application number
JP18308080A
Other languages
Japanese (ja)
Inventor
Akihiko Ono
Yoshiaki Sano
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP18308080A priority Critical patent/JPS57106915A/en
Publication of JPS57106915A publication Critical patent/JPS57106915A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is DC
    • G05F3/10—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics
    • G05F3/16—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices
    • G05F3/20—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
    • G05F3/30—Regulators using the difference between the base-emitter voltages of two bipolar transistors operating at different current densities

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

PURPOSE:To obtain an output current which is stable against variation in electric power while simplifying a starting circuit, by providing an output transistor (TR) and a shunting TR. CONSTITUTION:As a power voltage Vcc rises and a TRQ2 is nearly saturated, a current i2 increases. At this time, a potential at a point B drops, so a shunting TRQ6 is activated to shunt part of a current, flowing from a point A to the base of the TRQ2, to an earth GND. As a result, the current flowing to the TRQ2 decreases, so that the potential at the point B rises. Said succeeding operations are performed instantaneously through a negative feedback path which uses an output TRQ5, so the potential at the point B is held constant eventually without variation in voltage Vcc. This means that the currents of current mirror TRs Q3 and Q4 are constant, so a current i3 appearing at a terminal T1 is constant without reference to the variation in voltage Vcc.
JP18308080A 1980-12-24 1980-12-24 Constant current circuit Pending JPS57106915A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18308080A JPS57106915A (en) 1980-12-24 1980-12-24 Constant current circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18308080A JPS57106915A (en) 1980-12-24 1980-12-24 Constant current circuit

Publications (1)

Publication Number Publication Date
JPS57106915A true JPS57106915A (en) 1982-07-03

Family

ID=16129404

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18308080A Pending JPS57106915A (en) 1980-12-24 1980-12-24 Constant current circuit

Country Status (1)

Country Link
JP (1) JPS57106915A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59157729A (en) * 1983-02-26 1984-09-07 Rohm Co Ltd Constant current circuit
EP0352494A1 (en) * 1988-07-25 1990-01-31 STMicroelectronics S.r.l. A reduced turn-off current draw starter circuit for a stabilized band-gap voltage source in integrated circuits

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59157729A (en) * 1983-02-26 1984-09-07 Rohm Co Ltd Constant current circuit
EP0352494A1 (en) * 1988-07-25 1990-01-31 STMicroelectronics S.r.l. A reduced turn-off current draw starter circuit for a stabilized band-gap voltage source in integrated circuits

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