NSC2862
NSC2862 is a high-precision current sense amplifier with 1% accuracy, 80V common-mode range, and 500kHz bandwidth for industrial current sensing.
Product Overview
Description
The NSC2862 is a high-precision current sense amplifier designed for industrial and automotive applications requiring accurate current measurement. With 1% accuracy and 80V common-mode range, it provides reliable current sensing in high-voltage environments.
The device features a wide -0.3V to 80V common-mode input range, enabling both high-side and low-side current sensing in 48V and 72V systems. The fixed gain of 50V/V provides a full-scale output of 2.5V with 50mV sense voltage.
With 500kHz bandwidth, low offset voltage of 50uV, and AEC-Q100 qualification option, the NSC2862 is ideal for motor control, power supplies, and battery management systems requiring high-accuracy current measurement.
Product Series
NSC
Primary Application
Motor current sensing
Key Features
- 1% accuracy over full temperature range
- 80V common-mode input range
- 500kHz bandwidth for fast response
- 50uV max input offset voltage
- Fixed gain of 50V/V
- Low-side and high-side capable
- AEC-Q100 qualified option
- Wide operating temperature range
Specifications
| Supply Voltage | 2.7V to 5.5V |
|---|---|
| Channels | 1 Channel |
| Common-Mode Range | -0.3V to +80V |
| Gain | 50V/V (fixed) |
| Bandwidth | 500kHz |
| Input Offset Voltage | 50uV max |
| Accuracy | 1% max over temperature |
| Operating Temperature | -40C to +125C |
| Package | SOT23-6 |
| CMRR | 100dB min |
Applications
Motor current sensing
Motor drive and control systems
Power supply monitoring
Power conversion and supply
Battery management systems
Battery and charging management
Solar inverter current sensing
Renewable energy systems
Industrial automation
Industrial automation and control
Automotive powertrain
Automotive and EV electronics
FAE Expert Insights
"The NSC2862 is my preferred choice for applications requiring better than 1% current measurement accuracy. The 80V common-mode range is a significant advantage over competitors limited to 60V, enabling direct sensing in 48V and 72V industrial systems without additional level shifting. The 1% accuracy specification includes all error sources over temperature, providing confidence in measurement integrity. I've used this device in precision motor drives where accurate torque control depends on precise current measurement. The 500kHz bandwidth handles fast transient currents while the 50uV offset ensures accuracy at low current levels. For automotive applications, the AEC-Q100 qualified version provides the reliability required for powertrain systems."
Excellent accuracy and wide common-mode range for demanding current sensing
— Senior Signal Chain FAE, BeiLuo
Frequently Asked Questions
What is the difference between NSC2860 and NSC2862?
NSC2860 and NSC2862 are both current sense amplifiers but target different accuracy requirements: NSC2860 offers 3% accuracy with 100V common-mode range, making it suitable for general-purpose current sensing where cost is a primary concern. NSC2862 offers 1% accuracy with 80V common-mode range, ideal for applications requiring higher precision. Key differences: Accuracy - NSC2862 is 3x more accurate (1% vs 3%). Common-mode range - NSC2860 handles higher voltage (100V vs 80V). Bandwidth - NSC2862 is slightly faster (500kHz vs 400kHz). Offset voltage - NSC2862 has lower offset (50uV vs 200uV). Cost - NSC2860 is more cost-effective. Choose NSC2860 for general monitoring where 3% accuracy is sufficient. Choose NSC2862 for control applications requiring precise current measurement like motor torque control or battery coulomb counting.
Use NSC2862 for precision applications requiring 1% accuracy. Use NSC2860 for general monitoring with 3% accuracy at lower cost.
How do I calculate sense resistor value for NSC2862?
Sense resistor selection for NSC2862 involves balancing accuracy, power dissipation, and voltage headroom: The NSC2862 has fixed gain of 50V/V, so output voltage = I_load × R_sense × 50. For maximum output swing of 2.5V (with 5V supply), maximum sense voltage is 50mV. Calculate R_sense = V_sense_max / I_load_max. Example: For 10A maximum current: R_sense = 50mV / 10A = 5mohm. Power dissipation: P = I² × R = 100 × 0.005 = 0.5W. Select 1W resistor for safety margin. Accuracy considerations: At 10A, 5mohm gives 50mV sense voltage. NSC2862 50uV offset contributes 0.1% error (50uV/50mV). At 1A (10% load), sense voltage is 5mV, offset contributes 1% error. For better low-current accuracy, use larger R_sense or implement system calibration. Thermal considerations: Sense resistor power dissipation causes heating. Use low-TCR resistors (<50ppm/C) to minimize resistance change with temperature.
Calculate R_sense based on maximum current and desired output voltage. Use low-TCR resistors for temperature stability. Size resistor for 2x power margin.