Reverse latch hall element hx277 for Position sensing,Revolution counting,Speed Measurement

The HX277 is an integrated Latching Hall effect Sensor with output drivers, mainly designed for electronic commutation of brushless DC fans. This IC includes an on chip voltage regulator, reverse battery Diode, Hall plate, amplifier, comparator, and a pair of complementary open-collector outputs (DO, DOB). It provides a one-chip solution for driving two-coil brushless DC cooling fans. A novel VCC recovery circuit allows the complete two-wire fan control circuit to fit in a small four pin PB free package.   While the magnetic flux density (B) is larger than the operate point (BOP ), DO will turn on (low), and meanwhile D OB will turn off (high). Each output is latched until B is lower than the release point (BRP), and then DO and DOB will change state.   For a DC fan application, it is sometimes necessary to test the reversed power connection condition. The internal protection diode only protects the chip side and not the coil side. If it is necessary to protect the coil side then add one external diode to the application circuit to block the reverse current from the coil-side. See application circuit example on page 3.   Features and Benefits On-chip Hall sensor with two different sensitivity and hysteresis settings 3.5V to 20V operating voltage 400mA (avg.) output sink current Built-in protecting diode only for chip reverse power connecting -20° to +85°C operating Temperature Low cost and high sensitivity Hall Sensor   Applications Position Sensing Dual-coil Brush-less DC Motor Dual-coil Brush-less DC Fan Revolution Counting Speed Measurement   $1$  
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Product Categories : Reverse latch hall element