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| Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 General Description The AH287 is an integrated Hall sensor with output drivers for brushless DC motor application. This IC consists of two complementary outputs for motor's coil driving and has automatic lock protection and auto- restart function relatively. To avoid coil burning, rotor lock shutdown protection circuit shut down the output driver if the rotor blocked and then the automatic recovery circuit will try to restart the motor. This function repeats while rotor is blocked. Until the blocking is removed, the motor recovers running normally. In addition, the auto-restart time is flexible by adjusting the capacitance (CCT). Placing the device in a variable magnetic field, if the magnetic flux density is larger than threshold BOP, the DO is turned to sink and DOB is turned to drive. This output state is held until a magnetic flux density reversal falls below BRP, causing DO to be turned to drive and DOB turned to sink. This IC is available in TO-94 package. Features On-chip Hall Sensor * * Operating Voltage: 4V to 18V * Maximum Output Current: 350mA (ave) * Rotor-locked Protection * Automatic Restart * Adjustable Auto-restart Time * Internal Band-gap Regulator for Temperature Compensation * Operating Temperature: -20C to 85C * Low Profile TO-94 Package * ESD Rating: 300V (Machine Model) Application * Dual-coil Brushless DC Fan TO-94 Figure 1. Package Type of AH287 May 2008 Rev. 1. 0 1 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Pin Configuration Z4 Package (TO-94) 4 3 2 1 GND DOB DO CT Figure 2. Pin Configuration of AH287 (Front View) Pin Description Pin Number 1 2 3 4 Pin Name CT DO DOB GND Timing capacitance Output 1 Output 2 Ground Function May 2008 Rev. 1. 0 2 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Functional Block Diagram Regulator Temperature Compensation 2 DO Hall Sensor Amplifier Schmitt Trigger Output Driver 3 DOB Lock Protection and Auto Restart 1 CT 4 GND Figure 3. Functional Block Diagram of AH287 Ordering Information AH287 - Circuit Type Package Z4: TO-94 E1: Lead Free G1: Green Magnetic Characteristics A: 10 to 50 Gauss B: 5 to 70 Gauss C: 100 Gauss Part Number Marking ID Lead Free AH287Z4-E1 AH287Z4-E1 AH287Z4-E1 Package Temperature Range Lead Free AH287Z4-AE1 AH287Z4-BE1 AH287Z4-CE1 Green AH287Z4-AG1 AH287Z4-BG1 AH287Z4-CG1 Green AH287Z4-G1 AH287Z4-G1 AH287Z4-G1 Packing Type Bulk Bulk Bulk TO-94 -20 to 85C BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with "G1" suffix are available in green package. May 2008 Rev. 1. 0 3 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Absolute Maximum Ratings (Note 1, TA=25C) Parameter Supply Voltage Magnetic Flux Density Continuous Output Current Hold Peak (Start Up) Power Dissipation Thermal Resistance Die to Atmosphere Die to Package Case PD JA JC TSTG IOUT Symbol VCC B Value 20 Unlimited 350 550 750 550 227 49 -50 to 150 300 3000 Unit V Gauss mA mA mA mW C/W C/W C V V Storage Temperature ESD (Machine Model) ESD (Human Body Model) Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Parameter Supply Voltage Ambient Temperature Symbol VCC TA Min 4 -20 Max 18 85 Unit V C May 2008 Rev. 1. 0 4 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Electrical Characteristics VCC =14V, TA =25C, unless otherwise specified. Parameter Symbol Conditions B>150 Gauss, VCC=5V, VDOB=VCC, IDO=100mA (or B -150 Gauss, VCC =5V, VDO= VCC, IDOB=100mA) B>150 Gauss, VDOB= VCC, IDO=350mA (or B -150 Gauss, VDO= VCC, IDOB=350mA) B>150 Gauss, VDOB=VCC (or B -150 Gauss, VDO=VCC) RL=820, CL=20p RL=820, CL=20pF RL=820, CL=20pF Min Typ 1 Max 1.25 Unit V Output Saturation Voltage VSAT 1.2 1.45 V Supply Current Output Rise Time Output Fall Time Switch Time Differential Output Zener Breakdown Voltage Charge Current Discharge Current Clamp Voltage Comparator Voltage ICC tr tf t VZ ICHG IDHG VCL VCP 5 3 0.3 3 55 8 10 1.5 10 mA s s s V A A V V VCT=1 to 2.5V VCT=3.5 to 2.5V Limiting voltage Limiting voltage 5 0.5 3.2 2.2 May 2008 Rev. 1. 0 5 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Magnetic Characteristics (TA=25C) Parameter Operating Point Symbol BOP Grade A B C A Min 10 5 Typ Max 50 70 100 Unit Gauss -50 -70 -100 70 -10 -5 Gauss Releasing Point BRP B C Hysteresis BHYS Gauss Test Circuit Power Input AH287 (Front View) CT DO DOB GND S Marking Side 1 2 3 4 RL 820 RL 820 N CCT 2.2 F CL 20pF CL 20pF May 2008 Rev. 1. 0 6 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Magnetic Hysteresis Characteristics 14 14 12 12 10 10 DO Output (V) DOB Output (V) 8 8 6 6 4 4 2 2 0 -100 -50 0 50 100 0 -100 -50 0 50 100 Magnetism (Gauss) Magnetism (Gauss) Figure 4. DO Output vs. Magnetism Figure 5. DOB Output vs. Magnetism Typical Performance Characteristics 6 10 5 8 Supply Current (mA) 4 Supply Current (mA) o 6 3 4 2 1 TA=25 C 2 VCC=14V 0 2 4 6 8 10 12 14 16 18 20 0 -20 0 20 40 o 60 80 Supply Voltage (V) Ambient Temperature ( C) Figure 6. Supply Current vs. Supply Voltage Figure 7. Supply Current vs. Ambient Temperature May 2008 Rev. 1. 0 7 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Typical Performance Characteristics (Continued) 200 150 80 60 BOP/BRP/BHYS (Gauss) 100 BOP/BRP/BHYS(Gauss) 50 0 -50 -100 -150 -200 40 20 BOP BRP BHYS BOP BRP BHYS 4 6 8 10 12 14 16 18 0 -20 -20 0 20 40 o 60 80 Supply Voltage (V) Ambient Temperature ( C) Figure 8. BOP/BRP/BHYS vs. Supply Voltage Figure 9. BOP/BRP/BHYS vs. Ambient Temperature 2.0 1.8 800 Power Dissipation (mW) 1.6 Saturation Voltage (V) 600 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -20 0 20 40 o 400 VCC=14V IOUT=350mA 200 60 80 0 -25 0 25 50 75 o 100 125 150 Ambient Temperature ( C) Ambient Temperature ( C) Figure 10. Saturation Voltage vs. Ambient Temperature Figure 11. Power Dissipation vs. Ambient Temperature ( Table 1) Table 1: TA ( TA ( ) ) -20 551 70 352 -15 551 75 330 -10 551 80 308 -5 551 85 286 0 551 90 264 5 551 95 242 10 551 100 220 15 551 105 198 20 551 110 176 25 551 115 154 30 529 120 132 35 507 125 110 40 485 130 88 45 463 135 66 50 441 140 44 55 419 145 22 60 396 150 0 65 374 PD (mW) PD (mW) May 2008 Rev. 1. 0 8 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Typical Application (Note 2) Note 2: 1. The minimum startup voltage is 3.5V when D1 is disconnected. 2. The capacitances of CCT and C2 are adjustable base on system requirements. The recommended values are as below: CCT 1F/9V~2.2F/9V C2 1F/50V~2.2F/50V Figure 12. Typical Application of AH287 May 2008 Rev. 1. 0 9 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Operating Diagram (Note 3) Hall Input ON Motor Output OFF CT Clamp Voltage CT CT Comparator Voltage Motor locked Motor lock detected TON TOFF Motor lock cleared Reverts to normal operation Note 3: The automatic restart circuit detects a motor lock condition and automatically turns off the output current. When the lock is cleared, the IC automatically restarts and allows the motor to run. In AH287, automatic restart is performed in the following manner. A motor lock condition is detected when the Hall signal stops switching. The output is ON when CT pin is being charged, and OFF when CT pin is being discharged. TON = C * ( VCL - VCP ) (Sec ) ICHG C * ( VCL - VCP ) (Sec ) IDHG TOFF = Output ON time (TON) and OFF time (TOFF) are determined by C, the capacitance of the CT pin external capacitor. VCL is the CT pin clamp voltage VCP is the CT pin comparator voltage ICHG is the CT pin charge current IDHG is the CT pin discharge current Figure 13. Control Timing Diagram of AH287 May 2008 Rev. 1. 0 10 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Mechanical Dimensions TO-94 Unit: mm(inch) May 2008 Rev. 1. 0 11 BCD Semiconductor Manufacturing Limited BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility for use of any its products for any particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability arising out of the application or use of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or other rights nor the rights of others. MAIN SITE - Headquarters BCD Semiconductor Manufacturing Limited BCD Semiconductor Manufacturing Limited - Wafer Fab No. 1600, Zi Xing Road, Shanghai ZiZhu Science-based Industrial Park, 200241, China Shanghai SIM-BCD Semiconductor Manufacturing Limited Tel: +86-21-24162266, Fax: +86-21-24162277 800, Yi Shan Road, Shanghai 200233, China Tel: +86-21-6485 1491, Fax: +86-21-5450 0008 REGIONAL SALES OFFICE Shenzhen Office REGIONAL SALES OFFICE - Wafer Fab BCD Semiconductor Manufacturing Limited Shanghai Design Group - IC SIM-BCD Semiconductor Manufacturing Co., Ltd. 800 Yi Shan Road, Shanghai 200233, China Corporation Advanced Analog Circuits (Shanghai) Tel: +86-21-6485 900, Yi Shan Road, Shanghai 200233, China 8F, Zone B, 1491, Fax: +86-21-5450 0008 Tel: +86-21-6495 9539, Fax: +86-21-6485 9673 USA Office BCD Semiconductor Corp. USA Office 30920 Huntwood Ave. Hayward, BCD Semiconductor Corporation CA 94544, USA 30920 Huntwood Ave. Hayward, Tel 94544, U.S.A CA : +1-510-324-2988 Fax: +1-510-324-2788 Tel : +1-510-324-2988 Fax: +1-510-324-2788 Taiwan Office Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd., Shenzhen Office BCD Taiwan Office (Taiwan) Company Limited Semiconductor Shenzhen Office Room E, SIM-BCD Semiconductor 3rd Fuzhong Road, Futian District, Shenzhen, 4F, 298-1, Rui Guang Road,(Taiwan) Company Limited Shanghai 5F, Noble Center, No.1006,Manufacturing Co., Ltd. Shenzhen Office BCD Semiconductor Nei-Hu District, Taipei, 518026, China Taiwan 298-1, Rui Guang Road, Nei-Hu District, Taipei, Advanced Analog Circuits (Shanghai) Corporation Shenzhen Office 4F, Tel: +86-755-8826 Center, Tel: Taiwan Room E, 5F, Noble 7951 No.1006, 3rd Fuzhong Road, Futian District, Shenzhen 518026, China +886-2-2656 2808 Fax:+86-755-8826 7951 +86-755-8826 7865 Fax: +886-2-2656 28062808 Tel: Tel: +886-2-2656 Fax: +86-755-8826 7865 Fax: +886-2-2656 2806 |
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