Current transducers go straight onboard

Surface-mount single +5V supply current transducer reduces manufacturing costs.

LEM has extended its range of single +5V supply current transducers with the introduction of the HMS model.

The new unit measures only 16 x 13.5 x 12mm and integrates a primary conductor.

It is directly surface-mounted onto a printed circuit board, reducing manufacturing costs.

Four standard models are available to cover nominal AC, DC, pulsed and mixed isolated current measurement of 5, 10, 15 or 20A RMS, up to 50kHz, with a measuring span of up to +/-3Ipn.

The same mechanical design is used for all four models so that they can be used to measure current across a complete range of end products.

The internal reference voltage (2.5V) is provided on a separate pin or can be forced by an external reference (between 2 and 2.8V) for reference thermal drift cancellation.

Gain and offset are fixed and set so that, at Ipn, the output voltage is equal to the reference input or the reference output +/-0.625V.

A novel LEM ASIC designed for use with open-loop Hall-effect technology has been used to provide performance improvements.

These include better offset and gain drifts and linearity, in addition to an extended operating temperature range (-40 to +85C) compared with traditional discrete technology.

An additional version of the HMS transducer is being developed for PCB mounting through holes instead of surface mounting and will be available in the next few months.

The transducers are CE marked, conform to the EN50178 standard and are recognised for industrial applications such as home appliances, variable speed drives, UPS, SMPS, power inverters (solar, wind etc) and air-conditioners.

The HMS is supplied with a five-year warranty, as are all LEM industrial products.

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