Texas Instruments has unveiled the industry's first zero-drift Hall-effect current sensors.
The TMCS1100 and TMCS1101 offer the lowest drift and highest time and temperature accuracy with reliable 3 kVrms isolation, which is particularly important for high voltage AC or DC systems such as industrial motor drives, photovoltaic inverters, energy storage equipment and power supplies.
Continued demand for higher performance in industrial systems is leading to the need for more precise current measurement, as well as operational reliability, which often means higher costs in terms of board space or design complexity.
TI has deployed its expertise in both isolation and high-precision in a similar way for the TMCS1100 and TMCS1101, enabling engineers to design systems that will provide consistent performance and diagnostics for longer device lifetimes, while maintaining compact solution sizes and not increasing design time.
Improved system performance with minimal drift over time and temperature
The zero-drift architecture and real-time sensitivity compensation of the TMCS1100 and TMCS1101 allow extremely high performance to be achieved, even under operating conditions such as temperature variations and ageing equipment.
Con una deriva di sensibilità totale a livello leader del settore sulla temperatura pari allo 0,45%, massimo, ossia inferiore per almeno il 200% rispetto ad altri sensori di corrente magnetici, e con una deriva massima di offset a fondo scala pari a <0,1%, questi dispositivi offrono la massima precisione di misurazione e affidabilità su un ampio intervallo di corrente.
In addition, a sensitivity drift of 0.5% over the life of the device, i.e. at least 100% lower than other magnetic current sensors, significantly reduces performance degradation related to system ageing over time.
Reducing maintenance with ultra-high accuracy
In addition, thevery high accuracy of the TMCS1100 (1%, maximum) and TMCS1101 (1.5%, maximum) eliminates the need for device calibration, thus reducing equipment maintenance over time.
The devices also offer a typical linearity of 0.05%, which minimises signal distortion and helps maintain accuracy over the entire industrial temperature range (-40°C to 125°C).
Increased system lifetime with 3 kVrms isolation in an 8-pin SOIC package
The high quality construction of the TMCS1100 and TMCS1101 offers intrinsic galvanic isolation capable of providing 3 kVrms of isolation for 60 seconds according to Underwriters Laboratories (UL) 1577 standard for harsh environmental conditions in grid-connected or power systems.
Both devices support a lifetime operating voltage of ±600 V (up to 40% higher than competitive devices in the same 8-pin SOIC package) and have been rigorously tested to exceed industry-standard UL and VDE requirements for greater design margin and extended device life.
Meeting various design requirements and reducing system costs with greater flexibility
The TMCS1100 requires an external voltage reference for differential measurement, allowing engineers to optimise the design to meet the most stringent performance targets.
The TMCS1101, however, integrates the voltage reference, thus providing high performance in an industry-standard pin-to-pin implementation to simplify designs while reducing total costs.
For information on TMCS1100 click here
For information on TMCS1101 click here
