JPS5549033A - Transistor switching unit - Google Patents

Transistor switching unit

Info

Publication number
JPS5549033A
JPS5549033A JP12237578A JP12237578A JPS5549033A JP S5549033 A JPS5549033 A JP S5549033A JP 12237578 A JP12237578 A JP 12237578A JP 12237578 A JP12237578 A JP 12237578A JP S5549033 A JPS5549033 A JP S5549033A
Authority
JP
Japan
Prior art keywords
base
diode
emitter
circuit
approximate
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
JP12237578A
Other languages
Japanese (ja)
Inventor
Masahiro Takeshita
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP12237578A priority Critical patent/JPS5549033A/en
Publication of JPS5549033A publication Critical patent/JPS5549033A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
    • H03K17/0812—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit
    • H03K17/08126—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit in bipolar transitor switches

Landscapes

  • Details Of Television Scanning (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To obtain an inexpensive switching Tr circuit with Tr prevented from breaking down by connecting 1st and 2nd transistors Tr in a Darlington circuit and then by connecting a diode between the base and emitter of the 1st Tr. CONSTITUTION:Between the base and emitter of Tr 18 of Darlington Tr circuit 17, diode 22 is reversely connected. As a result, a forward base current cuts off the diode and in case of a reverse bias, a forward voltage of approximate -0.7V of diode 22 is applied to Tr 18 while the remainder is all applied between the base and emitter of Tr 21. Therefore, base-emitter dielectric strength of approximate 2.7V of Tr 21 is sufficinet, only a small collector current of exciting Tr 16 is required and a chip in case of IC-implementation never increases, so that a low-cost unit can be realized.
JP12237578A 1978-10-03 1978-10-03 Transistor switching unit Pending JPS5549033A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12237578A JPS5549033A (en) 1978-10-03 1978-10-03 Transistor switching unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12237578A JPS5549033A (en) 1978-10-03 1978-10-03 Transistor switching unit

Publications (1)

Publication Number Publication Date
JPS5549033A true JPS5549033A (en) 1980-04-08

Family

ID=14834277

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12237578A Pending JPS5549033A (en) 1978-10-03 1978-10-03 Transistor switching unit

Country Status (1)

Country Link
JP (1) JPS5549033A (en)

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