New from Silicon Labs is a current sense amplifier delivering robust isolation, high bandwidth and low signal delay.
The Si8920 provides an ideal current 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 vehicle (EV/HEV) systems.
Fast, accurate current sensing is essential for all high-power systems and power converters with high-voltage stages. Measuring current on high-voltage rails (up to 1200 V) with a galvanically isolated amplifier provides critical information to the low-voltage controller that improves system response time and efficiency.
The Si8920 provides a differential, low-voltage input scaled for connection to current shunt resistors, enabling the controller to make precise measurements of current on high-voltage rails while maintaining high electrical isolation. Its signal bandwidth of up to 750 kHz ensures rapid, precise DC current measurement and accurate representation of the primary signal and harmonics.
Using Silicon Labs’ proven, CMOS-based isolation technology, which meets stringent UL, VDE, CQC and CSA standards, the chip supports up to 5 kV withstand and 1200 V working voltage, and offers a wide operating temperature range, high noise immunity and long lifetimes. Exceptionally low 1 μV/°C offset drift ensures stable performance over diverse operating conditions.
The Si8920 provides very fast response time with 0,75 μs signal delay across the isolation barrier, allowing power control systems to react rapidly to transient load conditions. Ultra-low signal delay enables control loops to respond quickly, resulting in a more efficient and stable system as the controller can take action sooner to maintain the desired performance. Low signal delay also enables the power system to make quick corrective responses to unusual, potentially dangerous events, which helps reduce equipment repair and maintenance costs.
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