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 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 power.
The AnaChip ATS276/277 are integrated Hall sensors with output drivers, primarily designed for the electronic commutation of brush-less DC fans. The IC internally includes a regulator, protecting diode, Hall plate, amplifier, comparator, and a pair of complementary open-collector outputs (DO, DOB).
| Operating Voltage | 3.5V to 20V |
|---|---|
| Output Sink Current | 400mA (avg) |
| Operating Temperature | -20°C to 85°C |
| Package Type | 4 pin SIP |
| Supply Current | 16 to 25 mA |
| Output Saturation Voltage | 0.3V to 0.6V |
| Package Power Dissipation | 550 mW |
They are mainly designed for electronic commutation of brush-less DC fans, dual-coil brush-less DC motors, revolution counting, and speed measurement.
The ATS276 and ATS277 have two different sensitivity and hysteresis settings.
Yes, it has a built-in protecting diode for chip reverse power connecting, but it does not protect the coil-side.