Ultra-high accuracy coreless current sensor supporting 60Arms with more than 8mm of creepage / clearance distance

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CZ-3721 is an open-type current sensor using Hall sensors, which outputs the analog voltage proportional to the AC/DC current. Group III-V semiconductor thin film is used as the Hall sensor, which enables the high-accuracy and high-speed current sensing. Coreless ultra-small surface mount package realizes the space-saving. Also, the low primary conductor resistance suppresses heat generation to achieve the 60Arms continuous current. Existing coreless current sensors have an accuracy disadvantage from degradations caused by a disturbed magnetic field. The CZ-372x series has a built-in stray magnetic field reduction function to suppress this effect. The CZ-372x series is also UL 61800-5-1 safety compliant, which is an excellent fit for industrial AC drives, servo motors, etc. The CZ-372x series has a large variety of linear measurement ranges, from 10.3A (CZ-3720), to 345.2A, (CZ-3726). This enables the designer to use the same board design across different products and helps the user to expand the options to different current ratings.

Key Features

□ Compliant with safety standard of UL61800-5-1 (Clearance, Creepage distance ≥ 8.0mm)
□ Certified with safety standards of UL-1577 and IEC/UL60950-1
□ Maximum Primary Current : 60Arms
□ High-accuracy : 1.0%F.S.(Ta=0~90°C Typ.)
□ Quite small primary conductor resistance : 0.27mΩ Typ.
□ Fast response time : 1μs Typ.
□ Stray magnetic field reduction function
□ Small-sized surface mount package(12.7mm×10.9mm×2.25mm)
□ Differential output with VREF pin
□ Isolation Voltage:3.0kV(AC50Hz,60s)
□ Ratiometric output

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Block Diagram

Block Diagram

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