By Steve Bush 3rd May 2016
Current sensing with 1MHz bandwidth and 1.2mΩ insertion resistance is claimed by Allegro MicroSystems for its latest Hall-based sensor.
Response time for the ACS730, as it is to be called, is 210ns.
Being Hall-based, the sensed current path is electrically isolated from the measurement circuit so the IC can sense high-side current without an additional isolation barrier or differential amplifier.
AC and DC sensing is possible, with 0A represented by 2.5V out, changing at 100mV/A in either direction up to a maximum of +/-20A. The 2.5V reference is available for following circuits.
Industrial, commercial, and communications applications are expected in motor control, load detection, load management, switched-mode power supplies, and over-current fault protection.
The current path is copper, with temperature compensation provided by the conditioning circuitry. To remove the effect of internal dimensional variation, errors are minimised by programming after packaging.
Typical errors over -40 to 125°C are: +/-4% total, +/-4% gain, +/-50mV offset and +/-0.75% non-linearity. Max and min performance is specified over 25 to 125°C – see ACS730 data sheet. Typical total lifetime error drift is +/-1.5%.
An integrated electrostatic shield minimises capacitive coupling of fast voltage transients from the sense wire to the die and measures have been take to reduce sensitivity to external magnetic fields – a 1G field applied perpendicular to the package top (the axis with most residual external field sensitivity) “will result in around 0.1 A of error, that equates to 10 mV of error on the output of the sensor”, said Allegro.
There are also a +/-40A and +/-50A versions.
Packaging is low-profile (1.75mm) surface-mount SOIC-8.
Specified operating voltage is 5V. Integrated shield virtually eliminates capacitive coupling from current conductor to die due to high dV/dt voltage transients.
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