SO8 & SO16 Isolated Current Transducers Measure up to 30A
LEM has expanded its miniature, integrated circuit transducers range for ac and dc isolated current measurement up to 300kHz with the introduction of the GO series. These new components offer full isolation, despite their small size, by integrating the primary conductor for nominal current ratings of 4A, 6A, 8A, 10A, 12A, 16A, 20A or 30A with a bidirectional measurement range of 2.5 times the nominal current . Products in the GO series are able to support high overload currents up to 200A peak for short durations (1 ms).
The transducers are mounted directly onto a printed circuit board as SO8 or SO16 SMD devices, reducing manufacturing costs and providing much needed space saving for space-constrained applications.
GO models are simple to use, as they integrate low resistance primary conductors (minimizing power losses) within a proprietary ASIC to allow direct current measurement and consistent insulation performance, while still providing high creepage and clearance distances.
Standard models provide an analog voltage output with different sensitivity levels, relative to the model’s supply voltage, to achieve an output voltage of 800mV @ IPN for 5V versions and 500mV @ IPN for 3.3V versions. A Ratiometric output is also an available option with specific models.
GO transducers are not ordinary Open Loop Hall effect ASIC-based transducers; the series has been designed with unique primary integrated conductors for gradient measurement, to provide an excellent immunity against the external fields found in power electronic applications.
These dedicated designs combine field-proven techniques such as spinning and programmable internal temperature compensation within the EEPROM, which ensure high-performance accuracy over the full range of temperature, from -40 to +125 degrees C with a maximum of 3.74%. Absence of a magnetic circuit contributes to achieving this accuracy as there is zero magnetic offset generated. The accuracy over temperature and response time have been greatly improved in comparison to the previous generation. The GO series achieves a short response time of 2µs, which is very similar to the response time of a more traditional transducer with a magnetic circuit.
The SO16 package, provides two different Over-Current Detection (OCD) warning levels as a standard on 2 dedicated pins; one that’s optimized for a fast response, and the other is designed for accuracy.
Some applications, such as motor drives, have the same need for speed, size, and component price, but are less demanding of the current range and isolation levels. For high-volume white-goods, like window shutters and air-conditioning, GO is the solution as it is low cost, and very small.
In ac drives, ac & dc inverters, supplies, and servo-drive applications, GO brings a breath of fresh air. The GO series can easily compete against other traditional low cost current measurement solutions such as shunts, but GO provides galvanic insulation.
The GO series conforms to latest industrial standards, as well as being covered by LEM’s five-year warranty.
