NOVOSENSE has unveiled the new NSOPA240x series of operational amplifiers, offering innovative solutions to the challenges of resolver drive circuits. As essential components in high-precision, high-performance motor control technology, resolvers accurately measure angular position and rotational speed, playing a crucial role in various applications such as industrial motor controls, servos, robots, and powertrain units in electric and hybrid vehicles.

Resolvers provide precise and stable position information, critical for motor control algorithms in electric vehicles. This ensures optimal performance across a wide range of driving conditions by offering real-time feedback on rotor angle and speed, enabling smooth driving and instant response. Additionally, their high-temperature resistance, simple and reliable mechanism, compact size, and low cost make resolvers ideal for electric vehicle designs, reducing overall costs.

The design of resolver drive circuits faces several challenges, including the need for high current output and high slew rate to ensure stable excitation signals. Simplifying circuit design and improving system robustness are also critical, especially in complex noise environments with stringent safety requirements.

The NSOPA240x series addresses these challenges with high gain bandwidth, high slew rate, and continuous high output current drive function. These features meet the stringent requirements of resolver primary coils for low-distortion and differential high-amplitude excitation. The NSOPA240x also integrates internal thermal shutdown and overcurrent protection, optimizing circuit design, reducing system costs, and significantly improving overall system reliability and performance.

The automotive version of the NSOPA240x series meets AEC-Q100 Grade 1 reliability standards, operating in harsh environments from -40 to 125°C. Different channel versions are available, with TO252-5 packages for single-channel and HTSSOP14 packages for dual-channel needs.

Key Features of the NSOPA240x Series:

• High Current Output Capability: The NSOPA240x can deliver a continuous output current up to 400mA, fully meeting the drive requirements of various resolvers, which typically need strong current output due to low DCR (DC resistance).
• High Output Slew Rate: A crucial performance indicator, the slew rate of 5.5 V/μs ensures undistorted sinusoidal signals, meeting most resolver drive application requirements.
• Integrated Protection Features: The NSOPA240x integrates thermal shutdown protection and current limiting protection for both high side (PMOS) and low side (NMOS) output transistors. It provides system-level functional safety and indicates short circuits to power and ground, improving system reliability and reducing complexity and cost.

The NSOPA240x series by NOVOSENSE is a breakthrough in resolving the technical bottlenecks faced by resolver drive circuits, offering robust, high-performance solutions for modern motor control technology.