TMR current sensor suits high-speed power stages
With 10-MHz bandwidth and 50-ns response time, Allegro’s ACS37100 XtremeSense tunneling magnetoresistance (TMR) current sensor enables precise current measurement. It is designed for power-conversion systems using fast-switching GaN and SiC FETs, including EV chargers, solar string inverters, and server power supplies.
At sub-MHz frequencies, conventional magnetic sensors often lack the speed and accuracy needed for stable control and protection loops. The ACS37100 overcomes these limits with its high bandwidth and fast response, providing the high-fidelity current feedback essential for high-speed switching control.
Using XtremeSense TMR technology, the ACS37100 maintains a low noise level of 26 mA RMS across the full DC to 10‑MHz bandwidth, with ±2% sensitivity error over temperature. A voltage reference output supports differential routing in noisy environments, while a fault output provides an adjustable threshold for fast open-drain overcurrent detection.
The device provides reinforced isolation capable of withstanding 5 kV for 60 s (UL 62368‑1) and a basic working voltage of 1097 V. AEC‑Q100 Grade 0 qualification ensures operation over a -40 °C to +150 °C range. Its SOICW‑16 package offers 1.2 mΩ conductor resistance and 8 mm creepage and clearance.
Samples and evaluation boards are available to aid development.
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