CZ-3720 Clearance/Creepage 8mm CZ-3720 60A Accurate Coreless Current Sensor rms 1. General Description CZ-3720 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. 2. Features Compliant with safety standard of UL61800-5-1 (Clearance, Creepage distance 8.0mm) Certified with safety standards of UL-1577 and IEC/UL62368-1. Maximum Primary Current : 60A rms High-accuracy : 0.7%F.S.(T =0~90C Typ.) a Quite small primary conductor resistance : 0.27m Typ. Fast response time : 1s Typ. Stray magnetic field reduction function Small-sized surface mount package 12.7mm10.9mm2.25mm Differential output with VREF pin Isolation Voltage3.0kV AC50Hz 60s Ratiometric output 019005452-E-01 - 1 - 2021/11 CZ-3720 3. Applications AC motors DC motors UPS General Inverters Power conditioners Also, CZ-3720 is suitable for other applications which are required isolation with small size and suppressing heat generation. 4. Table of Contents 1. General Description ......................................................................................................................... 1 2. Features........................................................................................................................................... 1 3. Applications ..................................................................................................................................... 2 4. Table of Contents............................................................................................................................. 2 5. Block Diagram and Functions ......................................................................................................... 3 6. Pin Configurations and Functions ................................................................................................... 4 7. Absolute Maximum Ratings............................................................................................................. 5 8. Recommended Operating Conditions ............................................................................................. 5 9. Electrical Characteristics ................................................................................................................. 6 10. Characteristic Definitions ................................................................................................................. 8 11. External Circuits Example ............................................................................................................. 10 12. Board Layout for measuring thermal resistance ........................................................................... 10 13. Package .......................................................................................................................................... 11 14. Reliability Tests .............................................................................................................................. 14 15. Precautions .................................................................................................................................... 15 16. Revision History ............................................................................................................................. 16 IMPORTANT NOTICE .......................................................................................................................... 17 019005452-E-01 - 2 - 2021/11