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Application of TVS tube in protection circuit
Publish：SHENZHEN ENXIC ELECTRONICS CO., LTD,Schottky diodes, rectifier diodes, fast recovery diodes, switching transistors, thermistors, MOS tube, TVS tube, Youze Electronics Time：2017-11-23 Views:1189
Transient suppressor diode (TVS) is commonly used in electronic protection devices, and it is also one of the overvoltage protection devices. TVS tube is widely used in AC circuit, DC power supply protection, transistor circuit protection, integrated circuit operational amplifier protection and so on. The breakdown voltage of commonly used TVS diodes has a series of values from 5V to 550V. It has high reliability and reliable performance, and is not easy to deteriorate and has long service life in the scope of TVS pipe specification.
This paper mainly describes how to apply the TVS tube SMBJ5.0CA correctly and how to make the best application effect through the example of the typical application circuit in the protection of hot pluggable circuit and the protection of the power line of the car. SMBJ5.0CA has the ESD protection level of 15KV air discharge and 30KV contact discharge, less than 1ps response rate, 600W 10/1000us, duty less than 0.01% peak energy surge capacity, and the reverse working voltage is 5V, 65A under the clamp voltage is 9V, these main electrical characteristics make it very suitable for interface protection.
Generally speaking, RS-485 communication is used in the intelligent instrument industry. The following figure shows the typical application of RS-485 communication interface. When the RS-485 interface is not protected by static or surge damage, SMBJ5.0CA is usually used to protect the interface, as shown in Figure 3. When the static or surge voltage is higher than 5V, the SMBJ5.0CA will begin to move and clamp the voltage to a very low position. If the current exceeds the peak current IPP, the final voltage will be clamped around 9V. The device at the back level is not damaged.
RS-485 interface protection circuit
Integrated operational amplifier is very sensitive to external electrical stress. Therefore, in the process of using operational amplifier, excessive voltage or current, especially surge and electrostatic pulse, will often occur if the operation error or abnormal working conditions are taken, which can easily damage or fail the operation and amplifier. The 5V output DC regulated power supply, with SMBJ5.0CA at its voltage regulator output, can protect the instrument using the power supply, and can also absorb the peak voltage between the transistor‘s collector and the emitter in the circuit, thus protecting the transistor. Therefore, it is suggested that a SMBJ5.0CA tube be added to the output end of each regulator, which will greatly improve the reliability of the whole machine.
Protection circuit of op amp output
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