SDC276 ic product

         Speed Measurement

         Tachometer

         Dual coils Brush-less DC Fan

         Dual coils Brush-less DC Motor

n       APPLICATION

         TO-94  package

         -20 to 85 operating temperature

         Building-in protecting diode for reverse power connecting

         300mA(avg) output sink current

         3.5V to 20V operating voltage

         On-chip Hall sensor with two different magnetic points

n       FEATURES

 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.

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.

The SDC276 is composed of Hall Sensors and output drivers ,mainly designed for brush-less DC Fan in electronic communication. This IC internally includes the regulator, protecting diode.,Hall plate, amplifier, comparator, and a pair of complementary open-collector outputs (DO DOB).

n       GENERAL DESCRIPTION