Document
[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 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
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
5. Block Diagram and Functions IP
[CZ-3705]
Primary Conductor
Hall Sensors
Amplifier Compensation
Buffer
Voltage Generator
Bias Unit
EEPROM Unit
VOUT VREF
VSS VDD
IN TEST1 TEST2 TEST3 Figure 1. Block diagram of CZ-3705
Circuit Block Primary Conductor
Hall Sensors Amplifier Buffer
Compensation Bias Unit
EEPROM Unit Voltage Generator
Table 1.Explanation of circuit blocks
Function
A device has the primary conductor built-in. Hall elements which detect magnetic flux density generated from the measured current. Amplifier of Hall elements’ output. Output buffer with gain. This block outputs the voltage (VOUT) proportional to the current ap.