'Hall Effect' related articles 2

  1. 2009/08/03 ATS276 - Complementary Output Hall Effect Latch
  2. 2008/12/29 AH292 - High Voltage Hall Effect Latch
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.

Features
*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

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

ATS277, ATS276A-PLA-A, ATS277A-PLA-A, ATS276B-PLA-A, ATS277B-PLA-A

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General Description
AH266 is an integrated Hall sensor with output drivers designed for electronic commutation of
brush-less DC motor applications. The device includes an on-chip Hall voltage generator for
magnetic sensing, a comparator that amplifies the Hall voltage, and a Schmitt trigger to provide
switching hysteresis for noise rejection, and complementary darlington open-collector drivers for sinking large current loads. An internal bandgap regulator is used to provide temperature
compensated supply voltage for internal circuits and allows a wide operating supply range.
If a magnetic flux density (B) is larger than operate point (Bop), DO turn on (low) and DOB turn off (high). The outputs state is latched prior to reach release point (Brp). if B< Brp, DO turn off and DOB turn on. AH266 is rated for operation over temperature range from -20oC to 85 oC and voltage range from 4V to 28V. The devices are available in low cost die forms or rugged 4 pin SIP packages.

Features
*On-chip Hall plate
*Operating voltage: 4V~28V
*Output current: 400mA(Continuous, 25oC)
*Reverse protection diode only for chip reverse
*power connecting (Note)
*Output protection Zener breakdown Vz=62V(Typ)
*Package: SIP-4L

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

AH292A-PL, AH292B-PL, AH292C-PL

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