AK31 Series

Ultra-low Noise
Ultra-low Impedance
Small-sized
Coreless Current Sensor ICs

AK3101, AK3102, AK3103, AK3104, AK310H

AKM has developed ultra-low noise coreless sensors, the AK31 series, for large sized speakers such as subwoofers.
This is suitable for a system with voice coil current feedback with control of voice coil current, (Motion Feedback).
The AK31 series supports UL standards which works well with controlling industrial motors.

Applications

  • Current detection of audio speakers (Motional Feedback)
  • Motor drivers
  • General Inverter (Drives)
  • UPS's
  • Power conditioner (DC side)

It is suitable for the application which requires insulation and detection of very small current.

Features

Ultra-Low Noise

Previously, current sensors had large sensor noise problems. The AK31 reduces the noise with signal processing using an ultra-high sensitivity compound Hall element and LSI.
It achieves the world’s best noise performance of -108dBm/√Hz.*

Ultra-Low Impedance

Dumping factor for the AK31 is almost unaffected since it is capable of current detection with a 1.6mΩ impedance.
It is suitable for current detection within speakers such as in a Motion Feedback system.

Small package, Supporting Safety Standard

The AK31 adopts an small coreless package(D/W/H:7.6mm×7.9mm×1.15mm).
It is certified according to IEC/UL60950, IEC/UL62368 and IEC/UL1577, suitable for various industrial applications such as AC motors and general inverters.

AK31 Series

Lineup

AK31 Series

Product 
Name
Sensitivity
(mV/A)
Linear 
Sensing 
Range
(A)

Output Noise

(dBm/√Hz)

Response
time
(μs)
AK3101 195 ±10.7 -102 2
AK3102 100 ±21 -108
AK3103 60 ±35 -108
AK310H 50 ±42 -108

Certified with safety standards

Related Contents

Selection Table

Supply
Voltage
(V)
Output
Voltage
(V)
Effective
Current
(Arms)
Measurement
Range
(Apeak)
Bipolar /
Unipolar
Creepage
Clearance
(mm)
Working
Voltage *
(V)
Product Name Product Series
5.0 5.0 60 ± 5.3 to ± 180
Bipolar ≧ 8 800 CZ370x CZ37 Series
0 to 345.2 Unipolar CZ372x 
3.0 50 ± 11.6 to ± 166.6 Bipolar CZ3AGx CZ3A Series
3.3 3.3 ± 12.9 to ± 129.1 CZ3A0x
5.0 5.0 40 ± 33 to ± 60 ≧ 7.2 715 CZ381x CZ38 Series
5.0 5.0 20 ± 4.5 to ± 42 Bipolar
Unipolar
≧ 5 500 CQ330x CQ3 Series
3.3 3.3 ± 8.5 to ± 44 CQ320x
5.0 5.0 ± 10.7 to ± 42 AK310x AK31 Series

* Pollution Degree II with reinforced insulation