CURRENT AMPLIFIER Novosense launches current sense amplifiers to address PWM transient interference

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NOVOSENSE announced the launch of its new bidirectional current sense amplifier series, NSCSA240-Q, covering both industrial and automotive versions, designed for high-voltage PWM systems in vehicles and industrial equipments. The series integrates enhanced PWM rejection technology, supporting bidirectional current sensing with exceptional transient immunity, automotive-grade precision, and flexible configurability.

Featuring an ultra-wide input common-mode range from –4V to 80V, a typical input offset voltage of ±5μV, and a 135dB DC Common-Mode Rejection Ratio (CMRR). This series effectively tackles the challenge of high-frequency transient interference in PWM systems, providing a highly reliable current monitoring solution for automotive electronic power steering (EPS), motor drive, industrial automation and other applications. The NSCSA240-Q series meets the AEC-Q100 automotive reliability standard.

Superior transient immunity: reliable performance in high-voltage PWM environments

In PWM systems, rapid switching can cause severe common-mode voltage fluctuations that distort output signals in conventional amplifiers. The NSCSA240-Q series achieves an AC CMRR of 90dB at 50kHz, effectively suppressing ΔV/Δt transients. Its proprietary transient suppression design reduces output disturbances by up to 80%, achieving a recovery time of less than 10μs under 80V common-mode voltage transients. With a bandwidth ranging from 450kHz to 600kHz (gain-dependent), it supports both high-speed overcurrent protection and accurate low-frequency PWM signal capture—ensuring stable, low-noise signal performance for EPS, motor drive and industrial motor control systems. The wide –4V to 80V input common-mode range offers broad dynamic capability and robust tolerance across 12V, 24V, and 48V vehicle power architectures. Furthermore, ±2000V ESD protection (HBM/CDM) enhances resistance to external electrical disturbances, ensuring overall system reliability.

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The surface treatments behind automotive power electronics

Automotive-grade precision

Designed to meet the increasingly stringent current measurement requirements of automotive electronics, the NSCSA240-Q series delivers exceptional measurement stability. It features a typical input offset voltage of only ±5μV (maximum ±25μV) and achieves ±0.1% accuracy over a wide temperature range (–40°C to 125°C). With a typical gain error of 0.05%, it ensures reliable and consistent current monitoring even under harsh conditions. Fully qualified to the AEC-Q100 automotive standard, the series guarantees long-term reliability in demanding in-vehicle environments.

Flexible integration: multiple gain and package options for design optimization

As automotive systems trend toward miniaturization and integration, the NSCSA240-Q series is engineered for flexible and space-efficient design. It offers four fixed gain options—20V/V, 50V/V, 100V/V, and 200V/V—supporting shunt resistors ranging from 10mΩ to 0.1mΩ for flexible current detection. The series is available in two compact packages: SOIC-8 (4.9mm × 3.91mm) and TSSOP-8 (3mm × 4.4mm), allowing easy integration into space-constrained motor controller PCBs and helping designers optimize system layouts within limited board area

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