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Recycling IC blank material manufacturers share three minutes to take you to understand the advantages and classification of chip resistors
Edit:A-GRADE Electronic Technology Co., Ltd.   UpDate:2020-01-08

Manufacturers of recycled IC materials will share with you three minutes to understand the advantages and classification of chip resistors, and the role of alloy sampling resistors: There are two types of sampling resistors, one is a current sampling resistor, and the other is a voltage sampling resistor. The sampling resistor mentioned at this time is generally a current sampling resistor.

Sampling resistors have different expressions in the application of actual current in engineering. Generally speaking, they are current sampling resistors, current detection resistors, and current sampling resistors. Due to the special nature of their materials, one is a common thick film low resistance resistor. It can also play the role of current detection on low-demand consumer products, but in industrial control and high-demand battery protection systems, it is necessary to use a resistor made of alloy material for current collection, so it is also called alloy resistor or Alloy sampling resistor.

The main characteristics of alloy sampling resistors are as follows:

1, the material is alloy, the main material is copper, plus other materials to form manganese copper, constantan, nickel copper and so on.

2. Low resistance, the lowest resistance can be 0.2mR ~ 4R (determined according to size), generally 2512,1206,2725,2728, but with the continuous miniaturization and low power consumption of portable products Requirements, alloy sampling resistors are also gradually miniaturized, such as 0805,0603,0402 and so on.

3, high power, the power is higher than ordinary resistance and power increase resistance, such as: 1206 ordinary resistance power is 1 / 4W, 1206 liter power resistance is 1 / 2W, 1206 alloy resistance power is 1W / 1.5 W.

4. Low temperature coefficient, TCR value ppm / ℃. The temperature coefficients are 25ppm, 50ppm, 75ppm, and 100ppm. The temperature coefficient of ordinary low resistance resistors is 100ppm / 200ppm.

5, high precision, general ordinary low resistance resistance is 5%, 1%, and alloy sampling resistance is 1%, 0.5%.

6. Resistant to high current impact. Due to its special alloy material, it has better resistance to high current impact. In addition, the higher the power, the greater the current.

The alloy sampling resistor divides the resistance according to the function used by the product.

Alloy sampling resistors generally sample current or voltage signals. The accuracy of the sampling resistor is generally controlled at 1% or less.

The function is used as a reference. It is often used in feedback. Take a stabilized power supply circuit as an example. In order to keep the output voltage constant, take a part of the voltage from the output voltage as a reference (commonly used as a sampling resistor). , The input terminal automatically reduces the voltage to reduce the output; if the output is low, the input terminal automatically increases the voltage to increase the output. Generally used in power supply products, or power supply parts of electronic, digital, electromechanical products, with powerful functions.