General Description
ATS276/277 are integrated Hall sensors with output drivers, mainly designed for electronic commutation of brush-less DC Fan. This IC internally includes the regulator, protecting diode, Hall plate, amplifier, comparator, and a pair of complementary open-collector outputs (DO, DOB).
While the magnetic flux density (B) is larger than operate point (Bop), DO will turn on (low), and meanwhile DOB will turn off (high). Each output is latched until B is lower than release point (Brp), and then DO、DOB transfer each state.
For DC fan application, sometimes need to test power reverse connection condition. Internal diode only protects chip-side but not for coil-side. If necessary, add one external diode to block the reverse current from coil-side.

*On-chip Hall sensor with two different sensitivity and hysteresis settings for ATS276/277
*3.5V to 20V operating voltage
*400mA (avg) output sink current
*Build-in protecting diode only for chip reverse power connecting
*-20°C to 85°C operating temperature
*Low profile 4 pin SIP package

*Dual-coil Brush-less DC Motor
*Dual-coil Brush-less DC Fan
*Revolution Counting
*Speed Measurement


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