Current sensing resistors are also called sampling resistors. Simply speaking, it is an SMD sampling resistor with small resistors, it is usually series connected to circuit to exchange the current to voltage signals for test.
This kind of resistors are categorized by function. It is used for reference, generally applied in feedback circuits. Take Voltage regulated power supply circuit for instance, to keep output voltage in a permanent state, a part of voltage from output voltage as reference (usually using the form of sampling resistors), if output is high, the input end automatically lowers voltage to make output less; if output lower, the input end automatically boosts voltage to make output higher. Current sensing resistors are generally used in power supplies for electronics, digital products, mechanical and electrical products, etc. You will see lots of sampling resistors in many electronics.
Current sensing resistors usually are precision resistors with features of low resistance value, high precision, the tolerance is within ±1%. If higher requirements, precision of ±0.01% will be in need. SMD high precision resistors are in great demand to meet the requirements automatic manufacturing of small products.
We know the unit of resistors are ohm, and resistance value is usually below 1ohm for current sensing resistors. Some current sensing resistors require sampling voltage, then large resistance value resistors are required, if resistance base is large, the tolerance will be large. High precision resistors should be chosen.
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| Current Sensing Resistors for Power Supply |
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