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| 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 Wafer Body Blank or A~Z : if necessary to specify Package P: SIP-5L Lead L : Lead Free Magnetic Characteristics A or B *Packing: Bulk Typical Application Circuit 5V/12V + C1 Rpu 1 2 3 4 5 278 Coil1 Coil2 Speed R1 = R2 = 47 C1 = C2 = 2.2 F The R, C value need to be fine tuned base on coils design. R1 C1 R2 C2 5V/12V DC Brush-less Fan with FG output function 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 1/6 Oct 4, 2005 ATS278 Two Phase Hall Effect Latch With FG Output Block Diagram VCC 2 3 REG. Comparators Hall Plane Amp DO 4 DOB 5 GND 1 FG Pin Configuration 278 ( Front View ) 1 : FG 2 : VCC 3 : DO 4 : DOB 5 : GND 123 45 Name FG VCC DO DOB GND P/I/O O P O O P Pin # 1 2 3 4 5 Description Frequency detection output Positive power input Driver Output Driver Output ( Inverting ) Ground Anachip Corp. www.anachip.com.tw 2/6 Rev. 1.0 Oct 4, 2005 ATS278 Two Phase Hall Effect Latch With FG Output Absolute Maximum Ratings Characteristics Supply voltage Reverse VCC Polarity Voltage Magnetic flux density Continuous Output "on" current Hold Peak (Start Up) Sink current of FG Operating temperature range Storage temperature range Package Power Dissipation Symbol VCC VRCC B Ic IFG Ta Ts PD Values 20 -20 Unlimited 0.4 0.5 0.7 40 -20~+85 -65~+150 550 Unit V V A mA C C mW Electrical Characteristics ( Ta=+25C ) Characteristic Supply Voltage Output Saturation Voltage Output Zener Breakdown Output Leakage Current Supply Current Output Rise Time Output Falling Time Switch Time Differential Symbol VCC Vce(sat) Vz* Icex Icc tr tf t Conditions Vcc=14V, IL=300mA Vce=14V, Vcc=14V Vcc=20V, Output Open Vcc=14V, RL=820, CL=20pF (Test Circuit) Vcc=14V, RL=820, CL=20pF (Test Circuit) Vcc=14V, RL=820, CL=20pF (Test Circuit) Vcc=14V, IL=20 mA Min 3.5 ------------------Typ ---300 46 <0.1 16 3.0 0.3 3.0 Max 20 800 10 25 10 1.5 10 Unit V mV V A mA s s s FG saturation voltage ---200 700 mV VFG *Note: The Vz may vary with the inductance/resistance of DC Fan. In order to reduce the risk of dynamic operation, the capacitor/ resistor is recommended to add below the DO/DOB as Application Circuit (on page 1). RL1 = RL2 = 820 CL1 = CL2 = 20 pf 1 2 3 4 5 278 14V RL1 RL2 CL1 CL2 DO DOB ( Test circuit ) Anachip Corp. www.anachip.com.tw 3/6 Rev. 1.0 Oct 4, 2005 ATS278 Two Phase Hall Effect Latch With FG Output Magnetic Characteristics( Ta=+25oC) (1mT=10 Gauss) A grade Characteristic Operate Point Release Point Hysteresis B grade Characteristic Operate Point Release Point Hysteresis DOB Symbol BOP BRP BHYS Min. 10 -60 - Typ. 75 Max. 60 -10 - Unit Gauss Gauss Gauss Symbol BOP BRP BHYS Min. 5 -80 - Typ. 75 DO Max. 80 -5 - Unit Gauss Gauss Gauss Output Voltage in Volts RP OFF Output Voltage in Volts 12 10 8 6 4 2 OFF 12 10 8 6 4 2 OP ON OP Vsat RP Vsat -200 -100 0 ON -200 -100 0 100 200 100 200 Magnetic Flux Density in Gauss Magnetic Flux Density in Gauss Anachip Corp. www.anachip.com.tw 4/6 Rev. 1.0 Oct 4, 2005 ATS278 Two Phase Hall Effect Latch With FG Output Performance Characteristics (SIP5) Ta (C) Pd (mW) Ta (C) Pd (mW) Pd (mW) 1000 800 600 400 200 0 0 25 50 75 85 100 125 25 550 105 198 50 440 110 176 60 396 115 154 70 352 120 132 80 308 125 110 85 286 130 88 90 264 135 66 95 242 140 44 100 220 150 0 Power Dissipation Curve Ta (C) 150 Timing Diagram Rotor state Rotatory Locked Rotatory Locked DO DOB FG Marking Information ( Front View ) Part Number 278 X XX X x Wafer Lot ID: L & a~z is lead-free products ID Code: A~Z Nth week: 01~52 Year: "1" = 2001 "2" = 2002 Anachip Corp. www.anachip.com.tw 5/6 Rev. 1.0 Oct 4, 2005 ATS278 Two Phase Hall Effect Latch With FG Output Package Information Package type: SIP-5L ( unit: mm / [inch] ) 5.22 0.1 [0.206 0.003 ] 2 ~ 3 2-0.3C [0.079-0.012C] 2 ~ 5 1.55 0.1 [0.061 0.003] 4.2 REF [0.165 REF] 2 ~ 5 3.65 0.1 [0.144 0.003] 0.48 0.1 [0.019 0.003] 14.3 0.3 [0.563 0.012] 0.41 0.03 [0.016 0.001] 0.73 0.1 [0.029 0.003] 2 ~ 3 0.95 0.03 [0.037 0.001] 0.38 0.03 [0.015 0.001] Location of Sensing Point 2.006 mm [0.079 inch] ( Top View) 1.016 mm [0.04 inch] 1 2 3 4 5 Anachip Corp. www.anachip.com.tw 6/6 Rev. 1.0 Oct 4, 2005 |
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