High-voltage enable circuit applied to surge suppression chip
A technology of surge suppression and chips, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, can solve the problem that the enabling circuit is not suitable for high voltage applications, and achieve increased Process universality, reduce complexity, and improve the effect of VDD working range
Active Publication Date: 2019-11-22
58TH RES INST OF CETC
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[0012] The purpose of the present invention is to provide a high-voltage enabling circuit applied to surge suppression chips to solve the problem that traditional enabling circuits are not suitable for high-voltage applications
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Embodiment 1
[0036] The invention provides a high-voltage enabling circuit applied to a surge suppression chip, the structure of which is as follows: figure 2 As shown, it includes resistors R1 and R2, and also includes: diodes D1, D2 and transistor Q1; specifically, the first terminal of the resistor R1 is connected to the negative terminal of the diode D1, and the second terminal is connected to the emitter of the transistor Q1; The collector of the triode Q1 is connected to the positive terminal of the diode D2; the first terminal of the resistor R2 is connected to the negative terminal of the diode D2, and the second terminal is connected to the enabling port pin SHDN; the base of the triode Q1 is connected to the collector.
[0037] The high-voltage enabling circuit applied to the surge suppression chip also includes: resistors R3-R5 and triodes Q2-Q8; wherein, the first end of the resistor R3 is connected to the emitter of the transistor Q6, and the second end is grounded to GND; the...
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The invention discloses a high-voltage enable circuit applied to a surge suppression chip, and belongs to the technical field of electronic circuits. The high-voltage enable circuit comprises resistors R1 and R2, diodes D1 and D2 and a triode Q1; the first end of the resistor R1 is connected with the negative end of the diode D1, and the second end of the resistor R1 is connected with the emitterof the triode Q1; the collector electrode of the triode Q1 is connected with the positive end of the diode D2; the first end of the resistor R2 is connected with the negative end of the diode D2, andthe second end of the resistor R2 is connected with an enable port pin SHDN; and the base of the triode Q1 is connected with the collector thereof. By utilizing the characteristics of forward conduction and reverse cut-off of the diodes, the requirement on a thick gate oxide device is avoided, and the VDD working range is improved. After the circuit is adopted, the enabling port pin of the chip can be directly connected with the VDD, an external divider resistor is not needed, and the complexity of a peripheral circuit is reduced when the chip is applied. By reducing the requirement for a thick gate oxide device, the process universality of the circuit is improved, and the chip cost is reduced.
Description
technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a high-voltage enabling circuit applied to a surge suppression chip. Background technique [0002] With the rapid development of semiconductor integrated circuit technology, surge suppression chips are widely used in the fields of consumer electronics, industrial electronics, communication transmission and aerospace equipment due to their advantages of simple structure, low loss and fast response. Depending on the specific application conditions, the operating voltage range of the surge suppression chip can vary from a few volts to hundreds of volts. In order to make the working state of the chip controllable, the surge suppression chip needs to add an enable pin, which is used to judge whether the external power supply voltage meets the normal working requirements of the chip, and prevent the chip from being damaged due to abnormal operation. [0003] Traditional en...
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IPC IPC(8): H02H9/00
CPCH02H9/005
Inventor 奚冬杰徐晴昊
Owner 58TH RES INST OF CETC