Transient voltage suppressor (TVS) with improved clamping voltage

A transient voltage suppression and transient voltage technology, applied in emergency protection circuit devices, electrical components, circuit devices, etc. for limiting overcurrent/overvoltage, can solve problems such as difficult design and implementation, difficult optimization, etc.

Active Publication Date: 2011-01-05
ALPHA & OMEGA SEMICON INT LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, U.S. Patent Application 12/454,333 refers to the reduction of snapback through delicate form factor and difficult optimization, which is difficult to...

Method used

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  • Transient voltage suppressor (TVS) with improved clamping voltage
  • Transient voltage suppressor (TVS) with improved clamping voltage
  • Transient voltage suppressor (TVS) with improved clamping voltage

Examples

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Embodiment Construction

[0022] Figure 2A and Figure 2B Respectively represent the circuit diagram of the TVS circuit 100 of the present invention, and the I-V diagram (that is, the diagram of the relationship between current and voltage). The TVS circuit 100 is installed between a ground voltage terminal (Gnd) 105 and a Vcc voltage terminal 110 as a Vcc-Gnd clamping circuit. TVS circuit 100 includes a pair of steering diodes, diodes 115-H and 115-L, and 120-H and 120-L, for each of the two input / output (I / O) terminals 125-1 and 125- 2. In addition, the zener diode, that is, the diode 130 has a large size, and acts as a trigger diode, from the high voltage terminal 110 , that is, the Vcc terminal, to the ground voltage terminal, that is, the Gnd terminal. Zener diode 130 is connected in series with resistor 135 and in parallel with PNP bipolar transistor 142 and NPN bipolar transistor 140 . The PNP bipolar transistor 142 and the NPN bipolar transistor 140 together form a PNPN silicon controlled ...

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Abstract

This invention discloses an electronic device formed as an integrated circuit (IC) wherein the electronic device further includes a transient voltage suppressing (TVS) circuit for suppressing a transient voltage. The transient voltage suppressing (TVS) circuit includes a Zener diode connected between a ground terminal and a node for triggering a snapback circuit. In one embodiment, this node may be a Vcc terminal. The TVS device further includes a snapback circuit connected in parallel to the Zener diode for conducting a transient voltage current with a snapback current-voltage (I-V) characteristic upon turning on of the snapback circuit And, the TVS device further includes a snapback suppressing circuit connected in series with the snapback circuit for conducting a current with an I-V characteristic complementary to the snapback-IV characteristic for clamping a snapback voltage.

Description

technical field [0001] The present invention generally relates to a circuit structure and preparation method of a transient voltage suppressor (TVS). More specifically, the present invention relates to an improved circuit structure and method of making a transient voltage suppressor (TVS) with an improved clamping voltage. Background technique [0002] Transient voltage suppressors (TVS) are commonly used to protect integrated circuits from damage caused by sudden overvoltages on integrated circuits. Integrated circuits are designed within the normal range of voltages. However, some unexpected and uncontrollable high-voltage phenomena, such as electrostatic discharge (ESD), electrical fast transients, and secondary lightning, may have a sudden attack on the circuit. Transient voltage suppressors are used to protect circuits, and try to avoid possible damage to integrated circuits when these overvoltage phenomena occur. With the increase in integrated circuit devices that ...

Claims

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Application Information

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IPC IPC(8): H02H9/04H02H9/02
CPCH02H9/041
Inventor 雪克·玛力卡勒强斯瓦密
Owner ALPHA & OMEGA SEMICON INT LP
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