Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION General Description Features 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. · · · · · · AH478 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 This IC is available in TO-95 package. · · Single Coil Brushless DC Motor Single Coil Brushless DC Fan TO-95 Figure 1. Package Type of AH478 Nov. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 1 Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH478 Pin Configuration Z5 Package (TO-95) GND 5 4 3 2 1 DOB DO VCC CT Figure 2. Pin Configuration of AH478 (Front View) Pin Description Pin Number Pin Name Function 1 CT Lock and rotation setting capacitor terminal 2 VCC Supply voltage 3 DO Output 1 4 DOB Output 2 5 GND Ground Nov. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 2 Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH478 Functional Block Diagram VCC 2 VCC Regulator 4 Hall Sensor Schmitt Trigger Amplifier Predriver DOB VCC 3 5 Lock Protection and Auto Restart DO GND 1 CT Figure 3. Functional Block Diagram of AH478 Ordering Information AH478 - Circuit Type E1: Lead Free G1: Green Package Z5: TO-95 Magnetic Characteristics A: 5 to 70 Gauss B: 100 Gauss Package Temperature Range TO-95 -20 to 85oC Part Number Lead Free Marking ID Green Lead Free Green Packing Type AH478Z5-AE1 AH478Z5-AG1 AH478Z5-E1 AH478Z5-G1 Bulk AH478Z5-BE1 AH478Z5-BG1 AH478Z5-E1 AH478Z5-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. Nov. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 3 Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH478 Absolute Maximum Ratings (Note 1) (TA=25oC) Parameter Supply Voltage Magnetic Flux Density Symbol Value Unit VCC 20 V B Unlimited Gauss 250 mA 300 mA 600 mA PD 600 mW θJA 208 oC/W TSTG -50 to 150 Continuous Output ON Current IOUT Hold Peak (start up) Power Dissipation Thermal Resistance Die to atmosphere Storage Temperature o C ESD (Machine Model) 300 V ESD (Human Body Model) 3000 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 Min Max Unit VCC 3.5 18 V TA -20 85 oC Nov. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 4 Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH478 Electrical Characteristics (TA=25oC, VCC=14V, unless otherwise specified) Parameter Symbol Test Condition Min Typ Max Unit 0.2 0.25 V VCC1.0 VCC0.8 VCC V 16 mA IOUT=150mA Output Saturation Voltage (Sink) VSAT Output Saturation Voltage (Drive) IOUT=150mA Supply Current ICC VCC=20V, output open 14 Output ON Time TON RL=820Ω, CCT=0.47µF 135 ms Output OFF Time TOFF RL=820Ω, CCT=0.47µF 1 s Charge Current ICHG VCT=1 to 2.5V 3.5 µA Discharge Current IDHG VCT=3.5 to 2.5V 0.5 µA Duty Ratio DR TOFF/TON Clamp Voltage VCL Limiting Voltage 2.8 V Comparator Voltage VCP Limiting Voltage 1.8 V Thermal Resistance (Junction to Case) θJC TO-95 45 oC/W 5 7 10 Magnetic Characteristics (TA=25oC) Parameter Symbol Grade Min A 5 Typ Max Unit 70 BOP Operating Point Gauss B 100 A -70 B -100 -5 BRP Releasing Point Gauss BHYS Hysteresis 70 Gauss Test Circuit AH478 (Front View) S CT VCC DO DOB GND Marking Side 1 Power Input C1 10 µF N Nov. 2008 Rev. 1. 2 2 3 4 5 RL 820Ω CCT 2.2µ F BCD Semiconductor Manufacturing Limited 5 Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH478 Typical Performance Characteristics 18 16 16 Supply Current (mA) 14 Supply Current (mA) 12 O TA=25 C 10 CT Open CT to GND 8 6 14 12 VCC=14V 10 CT Open CT to GND 8 6 4 4 2 2 2 4 6 8 10 12 14 16 18 -20 20 -10 0 10 20 30 40 50 60 70 80 O Ambient Temperature ( C) Supply Voltage (V) Figure 5. Supply Current vs. Ambient Temperature Figure 4. Supply Current vs. Supply Voltage 80 100 60 80 BOP/BRP/BHYS (GS) BOP/BRP/BHYS(GS) 40 60 40 O TA=25 C BOP 20 BRP BHYS 0 20 VCC=14V BOP 0 BRP BHYS -20 -40 -20 -60 -80 -40 4 6 8 10 12 14 16 -20 18 -10 0 10 20 30 40 50 60 70 80 O 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 BCD Semiconductor Manufacturing Limited 6 Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH478 1000 1000 900 900 800 Saturation Voltage (mV) Saturation Voltage (mV) Typical Performance Characteristics (Continued) TA=25°C 700 VCC=14V 600 VSAT-up 500 VSAT-down 400 300 800 700 VCC=14V 600 IOUT=200mA 500 VSAT-up 400 VSAT-down 300 200 200 100 100 0 0 50 100 150 200 250 300 -20 350 -10 0 10 20 30 40 50 60 70 80 O Ambient Temperature ( C) Output Current (mA) Figure 8. Saturation Voltage vs. Output Current Figure 9. Saturation Voltage vs. Ambient Temperature Power Dissipation (mW) 600 500 400 300 200 100 0 -25 0 25 50 75 100 125 150 O Ambient Temperature ( C) Figure 10. Power Dissipation vs. Ambient Temperature Nov. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 7 Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH478 Typical Application AH478 (Front View) CT VCC DO DOB GND 1 2 3 4 5 Power Input C1 10µF Coil CCT (Note 2) Note 2: The capacitance of CCT can be selected from 1µF to 3.3µF, and the recommended value is 2.2µF. Figure 11. Typical Application of AH478 Nov. 2008 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 8 Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH478 Operating Diagram (Note 3) Hall Input ON OFF Motor Output CT Clamp Voltage CT Comparator Voltage CT 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 = C * ( VCL − VCP ) (Sec ) ICHG T OFF = 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 BCD Semiconductor Manufacturing Limited 9 Data Sheet SINGLE PHASE HALL EFFECT LATCH WITH LOCKED PROTECTION AH478 Mechanical Dimensions TO-95 Unit: mm(inch) 1.295(0.051) 1.803(0.071) 0.610(0.024) MIN 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 BCD Semiconductor Manufacturing Limited 10 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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