[CZ-3705] Clearance/Creepage 8mm
CZ-3705
60Arms Accurate Coreless Current Sensor
1. General Description
CZ-3705 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-370x series has a built-in
stray magnetic field reduction function to suppress this effect. The CZ-370x series is also UL 61800-5-1
safety compliant, which is an excellent fit for industrial AC drives, servo motors, etc. The CZ-370x
series has a large variety of linear measurement ranges, from ±5.3A (CZ-3700), to ±180A, (CZ-3706).
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/UL60950-1 □ Maximum Primary Current : 60Arms □ High-accuracy : 0.5%F.S.(Ta=0～90°C Typ.) □ Quite small primary conductor resistance : 0.27mΩ □ 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 Typ. 3. Applications
□ AC motors □ DC motors □ UPS □ General Inverters □ Power conditioners Also, CZ-3705 is suitable for other applications which are required isolation with small size and
suppressing heat generation.
018010046-E-00
-1-2018/8 [CZ-3705] 4. Table of Contents
1. General Description . 1 2. Features. 1 3. Applications . 1 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
IMPORTANT NOTICE . 16 018010046-E-00
-2-2018/8 [CZ-3705] 5. Block Diagram and Functions IP Amplifier Primary Buffer Hall …
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