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| Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION General Description The AH478 is a single coil Hall sensor with output drivers designed for brush-less DC motor application. This IC consists of one H-bridge driver for motor's coil driving and has automatic lock shutdown and restart function relatively. To avoid coil burning, rotor lock shutdown detection circuit shut down the output driver if the rotor is 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. If a 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-95 package. AH478 Features * * * * * * * * * * * On-chip Hall Sensor Rotor-locked Shutdown Automatically Restart Operating Voltage: 3.5 to 18V High Output Sourcing/Sinking Capability up to 300mA Bi-direction H-type Output Drivers for Single Coil Internal Bandgap Regulator for Temperature Compensation Low Output Switching Current Noise Operating Temperature: -20 to 85oC Low Profile TO-95 Package ESD Rating: 3000V (Human Body Model) Applications * * Single Coil Brushless DC Motor Single Coil Brushless DC Fan TO-95 Figure 1. Package Type of AH478 Nov. 2008 Rev. 1. 2 1 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION Pin Configuration Z5 Package (TO-95) AH478 5 4 3 2 1 GND DOB DO VCC CT Figure 2. Pin Configuration of AH478 (Front View) Pin Description Pin Number 1 2 3 4 5 Pin Name CT VCC DO DOB GND Function Lock and rotation setting capacitor terminal Supply voltage Output 1 Output 2 Ground Nov. 2008 Rev. 1. 2 2 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION Functional Block Diagram VCC 2 Regulator 4 DOB VCC AH478 Hall Sensor Amplifier Schmitt Trigger Predriver VCC 3 DO Lock Protection and Auto Restart 1 CT 5 GND Figure 3. Functional Block Diagram of AH478 Ordering Information AH478 Circuit Type Package Z5: TO-95 E1: Lead Free G1: Green Magnetic Characteristics A: 5 to 70 Gauss B: 100 Gauss Part Number Lead Free AH478Z5-AE1 AH478Z5-BE1 Green AH478Z5-AG1 AH478Z5-BG1 Marking ID Lead Free AH478Z5-E1 AH478Z5-E1 Green AH478Z5-G1 AH478Z5-G1 Package TO-95 Temperature Range -20 to 85oC Packing Type Bulk 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. Nov. 2008 Rev. 1. 2 3 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION Absolute Maximum Ratings (Note 1) (TA=25oC) Parameter Supply Voltage Magnetic Flux Density Continuous Output ON Current Hold Peak (start up) Power Dissipation Thermal Resistance Storage Temperature ESD (Machine Model) ESD (Human Body Model) Die to atmosphere PD JA TSTG IOUT Symbol VCC B Value 20 Unlimited 250 300 600 600 208 -50 to 150 300 3000 Unit V Gauss mA mA mA mW oC/W o AH478 C V V 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. "Absolute Maximum Ratings" for extended period may affect device reliability. Recommended Operating Conditions (TA=25oC) Parameter Supply Voltage Ambient Temperature Symbol VCC TA Min 3.5 -20 Max 18 85 Unit V oC Nov. 2008 Rev. 1. 2 4 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION Electrical Characteristics (TA=25oC, VCC=14V, unless otherwise specified) Parameter Output Saturation Voltage (Sink) Output Saturation Voltage (Drive) Supply Current Output ON Time Output OFF Time Charge Current Discharge Current Duty Ratio Clamp Voltage Comparator Voltage Thermal Resistance (Junction to Case) VSAT ICC TON TOFF ICHG IDHG DR VCL VCP JC Symbol Test Condition IOUT=150mA IOUT=150mA VCC=20V, output open RL=820, CCT=0.47F RL=820, CCT=0.47F VCT=1 to 2.5V VCT=3.5 to 2.5V TOFF/TON Limiting Voltage Limiting Voltage TO-95 5 VCC1.0 Min Typ 0.2 VCC0.8 14 135 1 3.5 0.5 7 2.8 1.8 45 10 V V oC/W AH478 Max 0.25 VCC 16 Unit V V mA ms s A A Magnetic Characteristics (TA=25oC) Parameter Operating Point Symbol BOP B A Releasing Point Hysteresis BRP B BHYS -100 70 Gauss -70 100 -5 Gauss Grade A Min 5 Typ Max 70 Gauss Unit Test Circuit AH478 S Marking Side 1 Power Input C1 10 F CCT 2.2 F (Front View) CT VCC DO DOB GND 2 3 4 5 RL 820 N Nov. 2008 Rev. 1. 2 5 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION Typical Performance Characteristics AH478 16 18 16 14 12 10 8 6 4 2 14 12 Supply Current (mA) TA=25 C 10 O Supply Current (mA) CT Open CT to GND VCC=14V CT Open CT to GND 8 6 4 2 2 4 6 8 10 12 14 16 18 20 -20 -10 0 10 20 30 40 50 O 60 70 80 Supply Voltage (V) Ambient Temperature ( C) Figure 4. Supply Current vs. Supply Voltage Figure 5. Supply Current vs. Ambient Temperature 100 80 60 40 80 BOP/BRP/BHYS(GS) BOP/BRP/BHYS (GS) 60 20 0 -20 -40 -60 -80 40 VCC=14V BOP BRP BHYS TA=25 C 20 O BOP BRP BHYS 0 -20 -40 4 6 8 10 12 14 16 18 -20 -10 0 10 20 30 40 50 O 60 70 80 Supply Voltage (V) Ambient Temperature ( C) Figure 6. BOP/BRP/BHYS vs. Supply Voltage Figure 7. BOP/BRP/BHYS vs. Ambient Temperature Nov. 2008 Rev. 1. 2 6 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION Typical Performance Characteristics (Continued) AH478 1000 900 1000 900 Saturation Voltage (mV) 700 600 500 400 300 200 100 0 50 TA=25C VCC=14V Saturation Voltage (mV) 800 800 700 600 500 400 300 200 100 0 VCC=14V IOUT=200mA VSAT-up VSAT-down VSAT-up VSAT-down 100 150 200 250 300 350 -20 -10 0 10 20 30 40 50 O 60 70 80 Output Current (mA) Ambient Temperature ( C) Figure 8. Saturation Voltage vs. Output Current Figure 9. Saturation Voltage vs. Ambient Temperature 600 Power Dissipation (mW) 500 400 300 200 100 0 -25 0 25 50 75 100 O 125 150 Ambient Temperature ( C) Figure 10. Power Dissipation vs. Ambient Temperature Nov. 2008 Rev. 1. 2 7 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION Typical Application AH478 AH478 (Front View) CT VCC DO DOB GND 1 Power Input C1 10F CCT (Note 2) 2 3 4 5 Coil Note 2: The capacitance of CCT can be selected from 1F to 3.3F, and the recommended value is 2.2F. Figure 11. Typical Application of AH478 Nov. 2008 Rev. 1. 2 8 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION Operating Diagram (Note 3) AH478 Hall Input ON OFF CT Clamp Voltage Motor Output CT CT Comparator Voltage Motor lock cleared Motor locked Motor lock detected TON 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 AH478, 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. T ON = T OFF = C * ( VCL - VCP ) (Sec ) ICHG C * ( VCL - V CP ) (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 12. Control Timing Diagram of AH478 Nov. 2008 Rev. 1. 2 9 BCD Semiconductor Manufacturing Limited Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION Mechanical Dimensions TO-95 1.295(0.051) 1.803(0.071) 0.610(0.024) MIN AH478 Unit: mm(inch) 1.700(0.067) 2.000(0.079) 0.850(0.033) 1.150(0.045) 3.531(0.139) 3.785(0.149) Package Sensor Location (For Hall IC) 1.220(0.048) 1.620(0.064) 0.381(0.015) 0.581(0.023) 14.000(0.551) 16.000(0.630) 0.360(0.014) 0.510(0.020) 0.950(0.037) REF 0.330(0.013) 0.432(0.017) 5.105(0.201) 5.359(0.211) Nov. 2008 Rev. 1. 2 10 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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