AH276
Complementary Output Hall Effect Latch

This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.0 Jul 21, 2005
1/6
„ 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

„ Applications

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




„ 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.


„ Ordering Information

AH276 X - X X X
Packing
Blank : Tube or BulkP: SIP-4L
Package Lead
L : Lead Free
Wafer Body
K: K version Wafer Body
Q: Q version Wafer Body



„ Typical Application Circuit

12 43
276
coil1 coil2
Vcc

Brush-less DC Fan