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Short circuit protection circuit

A short-circuit protection circuit and circuit technology, applied in emergency protection circuit devices, amplifier protection circuit arrangements, circuit devices, etc., can solve problems such as increased voltage drop

Active Publication Date: 2014-03-05
NAT SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the output current increases, R sense The pressure drop over the

Method used

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  • Short circuit protection circuit
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Examples

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Embodiment Construction

[0018] Reference will now be made in detail to the preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with the preferred embodiments, it will be understood that they are not intended to limit the invention to these embodiments. On the contrary, the invention is intended to cover alternatives, modifications and equivalents, which may be included within the spirit and scope of the invention as defined by the claims. Furthermore, in the detailed description of the invention, numerous specific details are set forth in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. In some instances, well-known methods, procedures, components and circuits have not been described in detail to avoid unnecessarily obscuring the present invention.

[001...

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PUM

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Abstract

Described herein is technology for, among other things, short-circuit protection. The technology involves sensing a current that is based on an output current and generating a current sense signal in response. The technology further involves buffering the current sense signal. The technology further involves limiting the output current when it exceeds a threshold value.

Description

Background technique [0001] In many circuits, especially amplifiers, it is necessary to limit the output drive using short-circuit protection to prevent the output device from becoming too hot if it is shorted or run away. Ideally, short circuit protection should not affect the normal operation of the circuit or its parametric performance. This usually results in an offset voltage being observed at the input before the short-circuit protection of the circuit begins to occur. [0002] Broadly speaking, this specification discloses short circuit protection with reduced offset voltage. [0003] figure 1 is a graph 100 showing load current versus offset voltage in a circuit employing short circuit protection. The solid line represents the relationship observed in conventional short-circuit protection circuits. The dashed line represents the ideal situation, that is, until the load current reaches the threshold (I T ) have not been observed so far. in I T , the ideal protect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03F1/52H02H7/12
CPCH02H9/025H03F1/52H02H7/12
Inventor 邱国富
Owner NAT SEMICON CORP
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