Highly dynamic MagnetoResistive Sensor for precise and flexible Current Measurement.

CFS1000Current Sensor.

AEC-Q100 qualified

CFS1000Programmable SMD housed AMR Current Sensor

High bandwidth current measu-rement: DC, AC (up to 500 kHz)

Excellent accuracy

Fast overcurrent detection with tunable threshold

Negligible hysteresis

Temperature range -40 °C to +125 °C

Standard SO16w package (SMD assembly)

High flexibility

Advantages

Applications

Electrical speed drives (industry, e-mobility)

Frequency converters

Photovoltaics (power inverters, micro inverters)

Battery management

Power supplies (welding technology)

Laser diode drivers

Switching power supplies

The programmable CFS1000 current sensor is designed for highly dynamic electronic measurement of DC, AC or pulsed currents. The used Anisotropic MagnetoResistive effect (AMR) enables excellent dynamic response without hysteresis or saturation effects, as present in current measurement systems using iron-cores. The CFS1000 current sensor consists of an AMR sensor chip, two bias magnets and a signal conditioning ASIC that are all packaged in a standard SMD SO16w package. By variation of the geometry of an external current conductor, the system can be adapted to different current ranges and applications.

The primary current to be measu-red is fed below the sensor through a U-shaped current conductor, as for example a

busbar. In this way, a magnetic differential field (gradient) is gene-

rated between both sides of the conductor, which is measured by

the sensor element. By measuring the field gradient at two measurement points being in close proximity, an excellent stray field immunity is achieved. The modulation of the sensor element is compensated by a magnetic counter field on the AMR-sensor chip. The value for this required compensating current is the proportional measure for the primary current and represents the output signal of the sensor. Based on the compensation of the primary field (closed-loop-principle), a high linearity is realized. CFS1000 current sensors are intended for high-volume applications. A special feature is the automotive qualification according to AEC-Q100.

Features

– Based on the anisotropic magnetoresistive (AMR) effect

– Measurement range defined by the geometry of the external primary current bar

– Primary nominal current (IPN) up to 1000 A

– Measurement range up to three times IPN

– High immunity against homogeneous magetic stray fields

– High linearity (closed-loop-principle) and low temperature dependency

– Galvanic isolation between IPN and current sensor

– Optional end-of-line calibration of sensitivity and offset in final application

– Automotive qualification according to AEC-Q100

IOUT IIN

1) Primary nominal current range is defined by the geometry of the external primary current bar. As measuring range threefold absolute nominal current is guaranteed, restricted to 1 s in a 60 s interval.

2) Overall accuracy error includes offset, linarity and sensitivity error (εΣ = εG + εoff + εlin).

Technical Data

Symbol Parameter Min. Typ. Max. Einheit

VCC Supply voltage 4.75 5.00 5.25 V

IPN Primary nominal current (RMS) 1) 10 - 1000 A

Iout Output current at IPN - 2 - mA

fcoUpper cut-off frequency (-3 dB) - 500 - kHz

εΣ Overall accuracy (T = 25 °C; calibrated) 2) - - ±1 %

TεΣ Overall accuracy (T = -40 to +125 °C; calibrated) 2) - - ±2 %

Tamb Ambient temperature -40 - +125 °C

Calibration Module

Product code Number of connectors Illustration

CFP1000AAA 1 x

CFP1000ABA 4 x

Evaluation Boards

Product code IPN (A) IPR (A) Illustration

CFK1015AAA 15 45

CFK1025AAA 25 75

CFK1050AAA 50 150

CFK1100ABA 100 300

CFK1250ABA 250 750

CFK1400ABA 400 1200

CFK1200ACA 3 x 200 3 x 600

IPN : Primary nominal current (RMS) IPR : Measurement range (for 1s in 60 s Interval; RM = 300 Ω)

Sensor

Product code Package Packaging Illustration

CFS1000AAA SOIC16wTape &Reel

Evaluation boards

Calibration tools

Freeware simulation tool for designing current bar geometries for the CFS1000 (see graphic)

Design-in support

... at a glance

We offer ...

Sensitec GmbHGeorg-Ohm-Straße 1135633 Lahnau · GermanyPhone: +49 6441 9788-0Fax: +49 6441 9788-17E-Mail: sensitec@sensitec.comwww.sensitec.com

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