Silicon Labs introduces a new isolated current sense amplifier that provides strong isolation and the industry's highest bandwidth and lowest signal delay. The Si8920 isolation amplifier provides an ideal shunt measurement solution for power control systems operating in harsh environments, such as industrial motor drives, solar inverters, high-voltage power converters, uninterruptible power supplies (UPS), and electric / hybrid electric vehicles ( EV / HEV) system.
Fast, accurate current sensing is essential for all high-power systems and power converters with high-voltage stages. Using galvanic isolation amplifiers to measure current on high-voltage power rails (up to 1200V) can provide important information to low-voltage controllers to improve system response time and efficiency. The Si8920 isolation amplifier provides a scaled differential low-voltage input that can be connected to a shunt resistor, enabling the controller to accurately measure current on the high-voltage rail while maintaining best-in-class electrical isolation. The Si8920 device's industry-leading signal bandwidth (up to 750 kHz) ensures fast, accurate DC current measurements and accurate representation of primary signals and harmonics.
The Si8920 isolation amplifier uses Silicon Labs' proven CMOS-based isolation technology, meets strict UL, VDE, CQC and CSA standards, supports up to 5kV withstand voltage and 1200 V operating voltage, and provides a wider operating temperature range, better Compared with competitive isolation technology, its noise immunity is longer. The extremely low 1 µV / C offset drift of the Si8920 amplifier ensures stable performance under various operating conditions.
The Si8920 provides a robust and reliable isolated amplifier solution that meets the product life requirements of industrial automation, green energy and Internet infrastructure equipment. Many power systems have a long-life warranty and are expected to operate in the field for 25 years or more. In many power systems, isolation can often be the first point of failure and is a life-limiting device. Conventional isolators based on optocoupler technology have a limited temperature range and will decrease with the external environment. In contrast, CMOS-based isolation components (such as the Si8920 isolation amplifier) can operate over the entire industrial temperature range and can support a product life of up to 100 years.
The Si8920 isolation amplifier provides very fast response time and an unparalleled 0.75µs signal delay on the isolation barrier, enabling the power control system to respond quickly to transient load conditions. The ultra-low signal delay enables the control loop to respond quickly, making the system more efficient and stable, as the controller can act faster to maintain the required performance. The company said that low signal latency also enables power systems to respond quickly to abnormal, potentially hazardous events, helping to reduce equipment repair and maintenance costs.
"Silicon Labs has designed the Si8920 isolated analog amplifier to meet the demanding operating conditions and reliability and longevity requirements of power conversion systems with high-voltage buses," said Ross Sabolcik, vice president and general manager of Silicon Labs access and isolation products. The high bandwidth and extremely low signal delay make it the best-in-class isolated current detection solution for motor drive systems, solar inverters, power converters and today's increasingly popular EV / HEV cars. ”The
Si8920 isolation amplifier is now available in standard SOIC and DIP packages and can be easily handled by an automated assembly system. The Si8920ISO-KIT evaluation kit allows developers to quickly connect to shunt resistors to evaluate the Si8920 analog isolation features, including low-voltage differential inputs, response time , Offset and gain characteristics.
