Driving circuit

A drive circuit, drive control technology, applied in the direction of logic circuit, logic circuit interface device, logic circuit connection/interface layout, etc., can solve the problem of inaccurate current limiting

Inactive Publication Date: 2004-03-31
LANTIQ DEUT GBMH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of using this scheme is that the current is fixed at a fixed value that cannot be changed after being adjusted by the fuse.
The disadvantage of using this scheme is that the current limit depends on the saturation current of the driving transistor, so the current limit is not very accurate

Method used

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Examples

Experimental program
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Embodiment Construction

[0023] Such as figure 1 As shown, the drive control part 2 has an input terminal IN and a first output terminal 11 and a second output terminal 12 . The first output terminal 11 is connected to the p-channel-MOS-drive transistor TPMOS. The second output 12 is connected to the control port of the pnp bipolar driver transistor TPNP. The load line segment of the first driving transistor TPMOS is connected between the first power supply voltage VDD and the output terminal 13 of the driving circuit. The load line segment of the second driving transistor TPNP is connected between the second power supply voltage VSS and the output terminal 13 of the driving circuit. The two drive transistors can be implemented in MOS technology or in bipolar technology. Generally, in a digital circuit, the first power supply voltage VDD is 5V and the second power supply voltage VSS is 0V, but other power supply voltages can also be selected, for example, the first power supply voltage 3.3V is sele...

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PUM

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Abstract

The invention relates to a driving circuit comprising a driver control circuit, a first and a second driving transistor and a current limiting device. In order to limit the current flowing through the driving transistor, said current limiting device controls the voltage at the gate of said first driving transistor. A control input of the current limiting device is used to adjust the current-limitation application point to the load to be controlled by a negative feedback. According to a second embodiment, a driving circuit having one of its two transistors designed as a MOSFET and the other one as a bipolar transistor is produced in such a way that diodes of the two driving transistors block the switched-off supply voltage or transmit the voltage according to a voltage applied on the output of said driving circuit.

Description

technical field [0001] The invention relates to a driving circuit. Background technique [0002] The drive circuit, as disclosed in U.S. Patent US-A-5,362,998, has a first and a second drive transistor, wherein the first output terminal of the drive control part is connected to the control port of the first drive transistor, and the drive control part The second output end of the second drive transistor is connected to the control port of the second drive transistor, and the load line segment of the first drive transistor is connected between the first power supply voltage and the output end of the drive circuit, and is connected between the second power supply voltage and the output end of the drive circuit. There is a load line section of the second driving transistor, wherein the driving circuit has a current limiting mechanism, wherein the current limiting mechanism is connected to the control port of the first driving transistor through a bidirectional control port, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K19/003H03K19/0175H03K19/0944
CPCH03K19/09448H03K19/00315H03K19/017518G05F3/26
Inventor 马丁·格勒普尔迪尔克·基拉特奥德温·哈泽海因茨·韦克尔
Owner LANTIQ DEUT GBMH
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