AH276
Complementary Output Hall Effect Latch Features
- On-chip Hall sensor with two different sensitivity and hystere...
AH276
Complementary Output Hall Effect Latch Features
- On-chip Hall sensor with two different sensitivity and hysteresis settings for AH276 - 400mA (avg) output sink current - Built-in protecting diode only for chip reverse power connecting - -20°C to 85°C operating temperature - Low profile 4 pin SIP package
General Description
AH276 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.
Applications
Dual-coil Brush-less DC Motor Dual-coil Brush-less DC Fan Revolution Counting Speed Measurement
Ordering Information
AH276 X - X X X
Wafer Body K: K version Wafer Body Q: Q version Wafer Body
Package P: SIP-4L
Lead L : Lead Free
Packing Blank : Tube or Bulk
Typical Application Circuit
276
coil1
coil2
1 Vcc
2
3
4
Brush-less DC Fan
This datasheet contains new product information. Anac...