PCB-mount current transducers offer highest performance from Hall-effect-devices
Six current transducer series join LEM’s portfolio; LXS, LXSR, LES, LESR, LKSR, LPSR. Each transducer can be mounted on PCBs for non-intrusive and isolated measurements. These closed-loop current transducers are based on a LEM custom proprietary Hall Effect ASIC, allowing them to perform at the level of fluxgate transducers.
The LxSR current transducer range has an offset drift that is over four times lower than the previous generation of closed-loop transducers based on Hall cells. The value reached is very similar to those using fluxgate. Offset drift achieves a value between 4 to 14 ppm/C.
Advanced manufacturing techniques have also been introduced with full automotive qualification in mind, allowing these new transducers to achieve the highest levels of quality and traceability. The LxSR production line has been designed to be autonomous, with an “Industry 4.0” approach.
Six families and 22 models are available with various options, such as an integrated reference (VREF), footprint (3 or 4 primary pins with different layouts), with an aperture and/or with integrated primary conductors and overcurrent detection output (LPSR models) on a dedicated pin to give an indication that a measured current is exceeding its expected value or to switch power off in the event of a short circuit. This provides a threshold detection independent of the main measurement.
LXSR, LESR, LKSR, LPSR models operate from a single 5 V supply and provide their internal reference voltage to a VREF pin. An external voltage reference between 0.5 and 2.75V can also be applied to this pin. They will be suited to applications where low offset drift is important such as in the AC output of solar power installations where standards require a very low DC component in the output current.
LEM; www.lem.com
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