ATC
Complementary Output Hall Effect Latch
ATS276/277
Features
General Description
- On-chip Hall sensor with two different sensitivity
and hysteresis settings for ATS276/277
- 3.5V to 20V operating voltage
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,
- 400mA (avg) output sink current
- Build-in protecting diode only for chip reverse
power connecting
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.
- -20°C to 85°C operating temperature
- Low profile 4 pin SIP package
Applications
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.
- Dual-coil Brush-less DC Motor
- Dual-coil Brush-less DC Fan
- Revolution Counting
- Speed Measurement
Ordering Information
ATS27X X - X X X - X
Magnetic
Packing
Part No.
Wafer Body
Lead
Package
P: SIP-4L
Characteristics
Blank or
6 : ATS276
7 : ATS277
L : Lead Free
Blank: Normal
Blank : Tube or Bulk
276:A or B or C
: Tape & Reel 277:A or B
A~Z : if necessary
to specify
A
Typical Application Circuit
27X
coil1
coil2
1
2
3
4
Vcc
Brush-less DC Fan
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.B1 Mar 17, 2004
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