Allegro Microsystems has announced a new high-speed magnetic current sensor featuring a bandwidth of up to 10 MHz. The device is designed to meet the demands of modern power conversion systems based on GaN and SiC technologies, where fast switching speeds and precise real-time current feedback are critical.
High Bandwidth and Fast Response
The new sensor, designated ACS37100, is built using Allegro’s XtremeSense™ tunnel magnetoresistance (TMR) technology. It delivers an analog output with up to 10 MHz bandwidth and an ultra-fast response time of approximately 50 ns, positioning it among the fastest magnetic current sensors available.
Despite its high speed, the device maintains a low noise level of around 26 mA RMS, enabling accurate detection of rapid current transients without extensive external filtering.
Designed for Wide-Bandgap Power Applications
The combination of wide bandwidth and minimal propagation delay makes the ACS37100 well suited for advanced power applications such as high-frequency DC-DC converters, onboard EV chargers, renewable energy inverters, and power supplies for data centers. In these systems, fast and accurate current sensing is essential for efficient control and protection.
Isolation, Accuracy, and Protection
The ACS37100 provides reinforced electrical isolation rated up to 5 kV in compliance with UL 62368-1, along with an operating temperature range from −40 °C to +150 °C. An integrated low-resistance current path of approximately 1.2 mΩ helps minimize power losses and thermal stress.
To further enhance system safety, the sensor includes a configurable FAULT output that can rapidly indicate overcurrent conditions, allowing designers to protect sensitive power switches and loads.
Enabling Next-Generation Power Electronics
By combining fast response, high bandwidth, and robust isolation in a compact form factor, the ACS37100 addresses the growing challenges of wide-bandgap power electronics. It enables more precise current monitoring, improved transient control, and higher overall system efficiency.
As GaN and SiC technologies continue to push switching frequencies higher, sensors like the ACS37100 play a key role in unlocking the full performance potential of next-generation power systems.