ATS278

www.DataSheet4U.com ATS278 Two Phase Hall Effect Latch With FG Output „ Features - On-chip Hall plate - Operating voltage: 3.5V~20V - Internal bandgap regulator allows temperature compensated operations and a wide operating voltage range - High output sinking capability up to 400mA for driving large load - Built-in protection diode only for chip reverse power connecting - Frequency Generation (FG) output - Package: SIP-5L „ General Description ATS278 is an integrated Hall sensor with two output drivers and rotor speed output, typically designed for electronic commutation of two-phase brush-less DC fan applications. On-chip Hall sensor will generate Hall voltage due to magnetics sensing. The amplifier will amplify the Hall voltage. The Schmitt trigger determines switching hysteresis and then control internal driver’s on/off to sink load current. Meanwhile, An internal bandgap regulator is used to provide stable bais due to temperature-compensation. FG pin will provide switching frequency of driver. Major feature is to minimize the external components by building-in FG output transistor. If a magnetic flux density larger than threshold Bop, DO is turned on (low) and DOB is turned off (high). The output state is held until a magnetic flux density reversal falls below Brp causing DO to be turned off and DOB turned on. „ Applications - Dual-coil Brush-less DC Motor - Dual-coil Brush-less DC Fan - Revolution Counting - Speed Measurement „ Ordering Information ATS278 X - X X - X...