Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 General Description Features 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). 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: -20˚C to 85˚C • Low Profile TO-94 Package • ESD Rating: 300V (Machine Model) 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. Application • Dual-coil Brushless DC Fan This IC is available in TO-94 package. TO-94 Figure 1. Package Type of AH287 May 2008 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Pin Configuration Z4 Package (TO-94) GND 4 3 DOB 2 1 DO CT Figure 2. Pin Configuration of AH287 (Front View) Pin Description Pin Number Pin Name 1 CT Timing capacitance 2 DO Output 1 3 DOB Output 2 4 GND Ground May 2008 Function Rev. 1. 0 BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Functional Block Diagram Temperature Compensation Regulator Hall Sensor Amplifier 2 Schmitt Trigger Output Driver 3 Lock Protection and Auto Restart 4 DO DOB GND 1 CT Figure 3. Functional Block Diagram of AH287 Ordering Information AH287 - E1: Lead Free G1: Green Circuit Type Magnetic Characteristics A: 10 to 50 Gauss B: 5 to 70 Gauss C: 100 Gauss Package Z4: TO-94 Package TO-94 Temperature Range -20 to 85°C Part Number Marking ID Lead Free Green Lead Free Green Packing Type AH287Z4-AE1 AH287Z4-AG1 AH287Z4-E1 AH287Z4-G1 Bulk AH287Z4-BE1 AH287Z4-BG1 AH287Z4-E1 AH287Z4-G1 Bulk AH287Z4-CE1 AH287Z4-CG1 AH287Z4-E1 AH287Z4-G1 Bulk 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 BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Absolute Maximum Ratings (Note 1, TA=25°C) Parameter Symbol Value Unit VCC 20 V B Unlimited Gauss 350 mA 550 mA 750 mA PD 550 mW Die to Atmosphere θJA 227 °C/W Die to Package Case θJC 49 °C/W TSTG -50 to 150 °C ESD (Machine Model) 300 V ESD (Human Body Model) 3000 V Supply Voltage Magnetic Flux Density Continuous Output Current IOUT Hold Peak (Start Up) Power Dissipation Thermal Resistance Storage Temperature 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 Symbol Min Max Unit Supply Voltage VCC 4 18 V Ambient Temperature TA -20 85 °C May 2008 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Electrical Characteristics VCC =14V, TA =25°C, unless otherwise specified. Parameter Output Saturation Voltage Symbol VSAT 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) Min Typ Max Unit 1 1.25 V 1.2 1.45 V Supply Current ICC B>150 Gauss, VDOB=VCC (or B＜-150 Gauss, VDO=VCC) 5 8 mA Output Rise Time tr RL=820Ω, CL=20pF 3 10 µs Output Fall Time tf RL=820Ω, CL=20pF 0.3 1.5 µs ∆t RL=820Ω, CL=20pF 3 10 µs Switch Time Differential Output Zener Breakdown Voltage VZ 55 V 5 µA Charge Current ICHG VCT=1 to 2.5V Discharge Current IDHG VCT=3.5 to 2.5V 0.5 µA Clamp Voltage VCL Limiting voltage 3.2 V Comparator Voltage VCP Limiting voltage 2.2 V May 2008 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 5 Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Magnetic Characteristics (TA=25°C) Parameter Symbol Operating Point BOP Grade Min Typ Max A 10 50 B 5 70 C Releasing Point BRP Hysteresis Unit Gauss 100 A -50 -10 B -70 -5 C -100 BHYS Gauss 70 Gauss Test Circuit Power Input AH287 (Front View) S CT Marking Side 1 DOB 2 3 GND 4 RL 820Ω RL 820Ω CCT 2.2 µ F N CL 20pF May 2008 DO Rev. 1. 0 CL 20pF BCD Semiconductor Manufacturing Limited 6 Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 14 14 12 12 10 10 DOB Output (V) DO Output (V) Magnetic Hysteresis Characteristics 8 6 8 6 4 4 2 2 0 -100 -50 0 50 0 100 -100 -50 0 50 100 Magnetism (Gauss) Magnetism (Gauss) Figure 4. DO Output vs. Magnetism Figure 5. DOB Output vs. Magnetism Typical Performance Characteristics 10 6 8 Supply Current (mA) Supply Current (mA) 5 4 3 2 0 2 4 6 8 10 12 14 16 18 0 20 Supply Voltage (V) VCC=14V -20 0 20 40 60 80 o Ambient Temperature ( C) Figure 6. Supply Current vs. Supply Voltage May 2008 4 2 o TA=25 C 1 6 Figure 7. Supply Current vs. Ambient Temperature Rev. 1. 0 BCD Semiconductor Manufacturing Limited 7 Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Typical Performance Characteristics (Continued) 80 200 150 BOP/BRP/BHYS(Gauss) BOP/BRP/BHYS (Gauss) 60 100 50 0 -50 -100 BOP -150 BHYS -200 40 20 BOP BRP 0 BHYS BRP 4 6 8 10 12 14 -20 16 -20 18 0 20 40 60 80 o Ambient Temperature ( C) Supply Voltage (V) Figure 8. BOP/BRP/BHYS vs. Supply Voltage Figure 9. BOP/BRP/BHYS vs. Ambient Temperature 2.0 800 1.8 Power Dissipation (mW) Saturation Voltage (V) 1.6 1.4 1.2 1.0 0.8 0.6 VCC=14V 0.4 600 400 200 IOUT=350mA 0.2 0.0 -20 0 20 40 60 0 -25 80 0 25 50 75 100 125 150 o Ambient Temperature ( C) o Ambient Temperature ( C) Figure 10. Saturation Voltage vs. Ambient Temperature Figure 11. Power Dissipation vs. Ambient Temperature ( Table 1) Table 1: TA (℃) -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 PD (mW) 551 551 551 551 551 551 551 551 551 551 529 507 485 463 441 419 396 374 TA (℃) 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140 145 150 PD (mW) 352 330 308 264 242 220 198 176 154 132 110 88 66 44 22 0 May 2008 286 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 8 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 C2 1µF/9V~2.2µF/9V 1µF/50V~2.2µF/50V Figure 12. Typical Application of AH287 May 2008 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 9 Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Operating Diagram (Note 3) Hall Input ON OFF Motor Output CT Clamp Voltage CT Comparator Voltage CT Motor lock cleared Motor locked TON Motor lock detected TOFF 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 TOFF = C * ( VCL − VCP ) (Sec ) IDHG 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 BCD Semiconductor Manufacturing Limited 10 Preliminary Datasheet TWO PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH287 Mechanical Dimensions TO-94 May 2008 Rev. 1. 0 Unit: mm(inch) BCD Semiconductor Manufacturing Limited 11 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. 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