Hall sensors can reduce systems costs

Automotive, industrial and consumer electronics can meet strict environmental standards, by virtue of Hall sensors of Infineon Technologies. According to the company, they help fulfil the requirements of cost-effective and compact designs. Devices in the TLx496x family are highly integrated, have precise switching points, a stable operation and a low power consumption. They are available as latch and switch-type sensors.

They consume no more than 1.6mA, or 50 per cent lower than comparable products, says the company. The 5V versions consume only 1.4mA. The high ESD robustness and the precise, stable magnetic switching points are suitable for systems where energy efficiency, robustness and precision are critical. Two to four of the previously needed passive components are now redundant, says the company, which also reduces the space occupied on the circuit board.

All of the switches and latches sensors have an integrated Hall element, a voltage regulator, choppers, an oscillator and an output driver. The voltage regulator powers the Hall element and the active circuits. The chopper ensures that the temperature remains stable and minimises the effects of process fluctuations, which occur  as each Hall sensor has a slightly different magnetic switching point, secondly, the permanent magnets in the BLDC motor lose magnetic field strength as the temperature rises; thirdly, the Hall output voltage is affected by stress and temperature.

The TLE496x-xM series is suitable for automotive applications with an operating voltage of 3.0 to 5.5V, which generally are not exposed to over-current. Operating temperature is  -40 to +170 degree C. They are typically used in power windows and sunroofs, boot locks, windshield wipers, seatbelts, camshafts, shift levers and the many controls used in BLDC motors. The latches’ (TLE4963-1M/2M) magnetic behaviour and switching points make them particularly suitable for applications with precise index counting (for pole wheels or the recording of the rotor position) and for BLDC motors. The Hall switch (TLE4965-5M) is particularly suitable for the recording of switch and lever positions and the detection of open/close states.

The TLI496x-xM series is functionally the same as TLE496x-xM but is specified for a temperature range of -40 to +125 degree C and is JESD47-qualified. They are typically used in BLDC motors in e-bikes and fans in PCs, in electric drives in building automation (such as blinds and garage doors) as well as the detection of open/close states in white goods and building security/burglar protection.

Optimized for cost-sensitive consumer electronics, the TLV496x-xTA/B series was specifically developed for cost-effective, contactless positioning. Typical applications are BLDC motors in white goods, compressors in air-conditioners, fans in PCs as well as blinds, garden tools and building security/burglar protection. They have a power consumption of 1.6mA and an ESD protection up to 4kVH HBM (Human Body Model). The output has over-current protection and automatically switches off at high temperatures.

The Hall sensors of all three series are available in high volume.



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