JPS5666931A - Clamp circuit for direct current load drive circuit - Google Patents

Clamp circuit for direct current load drive circuit

Info

Publication number
JPS5666931A
JPS5666931A JP14349279A JP14349279A JPS5666931A JP S5666931 A JPS5666931 A JP S5666931A JP 14349279 A JP14349279 A JP 14349279A JP 14349279 A JP14349279 A JP 14349279A JP S5666931 A JPS5666931 A JP S5666931A
Authority
JP
Japan
Prior art keywords
transistor
direct current
circuit
drive circuit
current load
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
JP14349279A
Other languages
Japanese (ja)
Inventor
Kiyoshi Nishimura
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.)
Rohm Co Ltd
Original Assignee
Rohm Co Ltd
Toyo Electronics Industry Corp
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 Rohm Co Ltd, Toyo Electronics Industry Corp filed Critical Rohm Co Ltd
Priority to JP14349279A priority Critical patent/JPS5666931A/en
Publication of JPS5666931A publication Critical patent/JPS5666931A/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
    • H03K17/0814—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the output circuit
    • H03K17/08146—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the output circuit in bipolar transistor switches

Landscapes

  • Direct Current Feeding And Distribution (AREA)
  • Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
  • Electronic Switches (AREA)

Abstract

PURPOSE:To ensure to protect the drive circuit, by flowing the backrash current to ground side with a transistor which turns on when the output level of the load side terminal of a drive transistor is at a failure level. CONSTITUTION:When the control input of a control input terminal 36 is from H to L level, transistors 24 and 26 are off, to interrupt the drive of a DC load 20. Thus, a counter electromotive force is produced on a load side terminal A and it is higher than the power supply voltage Vcc, then a transistor 42 is conductive and the backrash current flows to ground GND34 via a transistor 42.
JP14349279A 1979-11-06 1979-11-06 Clamp circuit for direct current load drive circuit Pending JPS5666931A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14349279A JPS5666931A (en) 1979-11-06 1979-11-06 Clamp circuit for direct current load drive circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14349279A JPS5666931A (en) 1979-11-06 1979-11-06 Clamp circuit for direct current load drive circuit

Publications (1)

Publication Number Publication Date
JPS5666931A true JPS5666931A (en) 1981-06-05

Family

ID=15339961

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14349279A Pending JPS5666931A (en) 1979-11-06 1979-11-06 Clamp circuit for direct current load drive circuit

Country Status (1)

Country Link
JP (1) JPS5666931A (en)

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