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CSR Resistors - Industry Applications
Automotive Electronics: CSR resistors are used in the automotive industry for battery management systems (BMS), motor control, and power management to ensure stable operation of electronic systems in both electric and traditional vehicles, and to provide overcurrent protection.
Electric vehicles: including two wheeled and three wheeled vehicles, use CSR resistors to monitor battery charging status and motor speed, helping optimize energy efficiency and performance.
Household appliances: CSR resistors are used for current detection and control in household appliances to improve energy efficiency and safety.
Consumer electronics products: CSR resistors are used for battery management and overcurrent protection in smartphones, laptops, and other portable devices.
Industrial Automation: CSR resistors are used for motor control and power management in industrial automation systems to improve system accuracy and reliability
- Battery Management System (BMS)
- High performance kernel
- energy recovery system
- Overcurrent protection
- Rich memory configuration
- Flexible power management
CSR selection and application precautions
PCB Layout
● In practical applications, PCB layout has a significant impact on CSR performance；
● The size of CSR electrodes should match the size of PCB pads (recommended sizes are specified in the specification sheet)；
● Adopting a four wire connection, the voltage wire is led out from the middle of the end pad to correctly detect the current in the circuit, without being affected by copper foil and solder。
Precautions for incoming material inspection:
● The incoming inspection requires the use of surface mount testing and Kelvin testing method. The Kelvin test method, also known as the four probe test method, is a simple testing method that can eliminate the influence of contact resistance, as shown in the figure。
rated power
Calculation formula: P=I2 * R, where I refers to the root mean square current in an AC circuit. The layout design of the circuit board (Pad) will affect the surface temperature of the product, so the product specification sheet needs to provide the size and area of the solder pads for the designer's reference. The rated power shows a decline phenomenon when it exceeds 70 ℃, and it is generally recommended to use it below 50% of the rated power, with a maximum not exceeding 75%.
resistance value
A resistor is a power loss component, and choosing a resistor that is too large will increase the circuit's losses; The selected resistance value must meet the detection accuracy of the IC. For example, if an IC with a voltage detection accuracy of 20mV detects a current of 4A, the selected CSR must not be less than 5m Ω. The specification book for general ICs will have a CSR recommendation value. The commonly used specifications are 1mR, 2mR, 5mR, 10mR, and 20mR.
Temperature Coefficient of Resistance (TCR)
- The lower the TCR, the better, and the smaller the TCR, the less affected the resistance value is by temperature changes. For example, when TCR=100ppm, if the temperature of the resistor increases by 100 degrees, the resistance value of the resistor will change by 100 * 100ppm=0.01, which is a 1% change. When measuring the TCR of low resistance CSR, specialized low resistance instruments and stable four wire testing methods are required, otherwise it will affect the measurement results.
Resistance Accuracy
The higher the accuracy, the better. Common resistance accuracies are ± 0.5% (D level), ± 1% (F level), ± 2% (G level), and ± 5% (J level). It is necessary to use specialized instruments for measuring low resistance and adopt a stable four wire testing method, otherwise it will affect the measurement results.
High power dissipation capability
CSR resistors can withstand high power dissipation and are suitable for high current applications. When choosing CSR resistors, factors such as resistance, accuracy, TCR, power dissipation capacity, and packaging size need to be considered.