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| AH276 Complementary Output Hall Effect Latch Features - On-chip Hall sensor with two different sensitivity and hysteresis settings for AH276 - 400mA (avg) output sink current - Built-in protecting diode only for chip reverse power connecting - -20C to 85C operating temperature - Low profile 4 pin SIP package General Description AH276 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 DODOB 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. Applications Dual-coil Brush-less DC Motor Dual-coil Brush-less DC Fan Revolution Counting Speed Measurement Ordering Information AH276 X - X X X Wafer Body K: K version Wafer Body Q: Q version Wafer Body Package P: SIP-4L Lead L : Lead Free Packing Blank : Tube or Bulk Typical Application Circuit 276 coil1 coil2 1 Vcc 2 3 4 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.1.0 Jul 21, 2005 1/6 AH276 Complementary Output Hall Effect Latch Block Diagram 1 VCC DO 2 REG. Hall Plate Amp DOB 3 GND 4 Pin Assignment Front View 1 : VCC 2 : DO 3 : DOB 12 3 4 4 :GND 276 Name Vcc DO DOB GND P/I/O P O O P Pin # 1 2 3 4 Description Power Supply Input Output Pin Output Pin Ground Anachip Corp. www.anachip.com.tw 2/6 Rev.1.0 Jul 21, 2005 AH276 Complementary Output Hall Effect Latch Absolute Maximum Ratings ( at Ta=25C ) Characteristics Supply voltage Reverse VCC Polarity Voltage Magnetic flux density Continuous Output "on" current Hold Peak (Start Up) Operating temperature range Storage temperature range Package Power Dissipation Maximum Junction Temp Symbol VCC VRCC B Ic Ta Ts PD Tj Values 20 -20 Unlimited 0.4 0.5 0.7 -20~+85 -65~+150 550 150 Unit V V A C C mW C Electrical Characteristics (T=+25C) Characteristic Low Supply Voltage Supply Voltage Output Zener Breakdown Output Saturation Voltage Output Leakage Current Supply Current Output Rise Time Output Falling Time Switch Time Differential Symbol Vce Vcc Vz Vce(sat) Icex Icc tr tf t Conditions Vcc=3.5V, IL=100mA K version Q version K version Q version Vcc=14V, IL=400mA Vce=14V, Vcc=14V Vcc=20V, Output Open Vcc=14V, RL=820, CL=20pF Vcc=14V, RL=820, CL=20pF Vcc=14V, RL=820, CL=20pF Min 3.5 2.5* Typ 0.4 46 35 0.7 <0.1 16 3.0 0.3 3.0 Max 20 20 0.9 10 25 10 1.5 10 Units V V V V A mA s s s *The output of DO/DOB will be switched on/off after supply voltage reaching the 2.5V. Test Circuit 14V 276 RL1 RL2 CL1 CL2 DO DOB RL1=RL2=820 Ohm CL1=CL2=20 pF Anachip Corp. www.anachip.com.tw 3/6 Rev.1.0 Jul 21, 2005 AH276 Complementary Output Hall Effect Latch Magnetic Characteristics (Ta=+25C, VCC=12V) K version Characteristic Operate Point Release Point Hysteresis Q version Characteristic Operate Point Release Point Hysteresis Symbol Bop Brp Bhy Symbol Bop Brp Bhy Min. -110 Min. 5 -70 Typ. 110 Typ. (1mT = 10 Gauss) Max. Unit 110 Gauss Gauss Gauss Max. 70 -5 Unit Gauss Gauss Gauss DO ( Output Voltage ) ( Output Voltage ) DOB Vcc ( off-state ) ( off-state ) Vcc Turn off Bhy Turn on Turn on Bhy Turn oFF ( on-state ) ( on-state ) Vsat Vsat S N Brp 0 Bop S ( Magnetic flux density B ) N Brp 0 Bop ( Magnetic flux density B ) Performance Characteristics (SIP-4) Ta (C) Pd (mW) Ta (C) Pd (mW) P d (m W ) 600 500 400 300 200 100 0 0 25 50 75 85 100 125 150 T a ( C ) 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 P o w e r D is s ip a tio n C u rve Anachip Corp. www.anachip.com.tw 4/6 Rev.1.0 Jul 21, 2005 AH276 Complementary Output Hall Effect Latch Operating Characteristics DO ( Output Voltage ) S Marking side Vcc High Vd Bhy Low N ( SIP4 ) N Vsat Brp 0 Bop S ( Magnetic flux density ) Marking Information ( Top View ) Part Number 276 X XX X X Wafer Lot ID: a~z K: AH276K-PL Q: AH276Q-PL Nth week: 01~52 Year: "1" = 2001 "2" = 2002 ~ Anachip Corp. www.anachip.com.tw 5/6 Rev.1.0 Jul 21, 2005 AH276 Complementary Output Hall Effect Latch Package Information Active Area Depth Marking side 1.35mm 1.75mm 1.1mm + 0.1mm Package Sensor Location 1.95mm + 0.1mm 0.7mm 1 2 3 4 1 2 3 4 K version Q version Package Dimension 5 -7 1.55mm +/-0.1mm 1.03mm +/-0.1 0.30mm +/-0.1mm 3 -5 o o o o 14.25mm +/-1.25mm 0.38mm +/-0.03mm 3.65mm +/-0.1mm 0.46mm +/-0.03mm 0.41mm +/-0.03mm 3.81mm +/-0.03mm 5.22mm +/-0.1mm 4.20mm +/-0.1mm 5 -7 o o 3 -5 o o 276 0.2mm Max. 1.42mm+/-0.1mm 1.27mm +/-0.03mm Anachip Corp. www.anachip.com.tw 6/6 Rev.1.0 Jul 21, 2005 |
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