Data Sheet SINGLE PHASE HALL EFFECT LATCH AH477A General Description Features The AH477A is an integrated Hall sensor with Hbridged output driver designed for brushless DC motor applications. The device includes an on-chip Hall sensor for magnetic sensing, an amplifier that amplifies the Hall voltage, a comparator to provide switching hysteresis for noise rejection, a bi-directional drivers for sinking and driving large current load. It also includes an internal bandgap regulator to provide temperature compensated bias for internal circuits and allows a wide operating supply voltage range. · · · · · · · · · 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 the magnetic flux density reverses and falls below BRP, then causes DO to be turned to drive and DOB turned to sink. On-Chip Hall Sensor Operating Voltage: 3.5V to 18V H-Bridge Output Drivers for Single Coil Internal Bandgap Regulator for Temperature Compensation Low Output Switching Current Noise Operating Temperature: -20oC to 85oC Low Profile TO-94 (SIP-4L) Package ESD Rating: 6000V (Human Body Model) Suitable for PWM Power Supply Control Speed Applications · · Single-coil Brushless DC Motor Single-coil Brushless DC Fan The AH477A is available in TO-94 (SIP-4L) package. TO-94 Figure 1. Package Type of AH477A Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 1 Data Sheet SINGLE PHASE HALL EFFECT LATCH AH477A Pin Configuration Z4 Package (TO-94) 4 GND 3 2 DOB DO 1 VCC Figure 2. Pin Configuration of AH477A (Front View) Pin Description Pin Number Pin Name Function 1 VCC Supply voltage 2 DO Output 1 3 DOB Output 2 4 GND Ground Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 2 Data Sheet SINGLE PHASE HALL EFFECT LATCH AH477A Functional Block Diagram VCC 1 VCC Regulator 2 Hall Sensor Amplifier Schmitt Trigger PreDriver DO VCC 3 DOB 4 GND Figure 3. Functional Block Diagram of AH477A Ordering Information AH477A - Circuit Type G1: Green Package Z4: TO-94 (SIP-4L) Magnetic Characteristics A: 5 to 70 Gauss B: 100 Gauss Package Temperature Range TO-94 -20 to 85oC Part Number Marking ID Packing Type AH477AZ4-AG1 477AZ4-G1 Bulk AH477AZ4-BG1 477AZ4-G1 Bulk BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 3 Data Sheet SINGLE PHASE HALL EFFECT LATCH AH477A Absolute Maximum Ratings (Note 1) (TA=25oC) Parameter Symbol Value Unit VCC 20 V B Unlimited Gauss 250 mA 300 mA 600 mA PD 550 mW Die to atmosphere θJA 227 oC/W Die to package case θJC 49 TSTG -50 to 150 oC ESD (Machine Model) 600 V ESD (Human Body Model) 6000 V Supply Voltage Magnetic Flux Density Continuous Output Current IO Hold Peak (start up) Power Dissipation Thermal Resistance Storage Temperature o C/W 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 Frequency (PWM Power) Ambient Temperature Symbol Min Max Unit VCC 3.5 18 V f 0.1 25 kHz TA -20 85 Oct. 2009 Rev. 1. 2 o C BCD Semiconductor Manufacturing Limited 4 Data Sheet SINGLE PHASE HALL EFFECT LATCH AH477A Electrical Characteristics (TA=25oC, VCC=14V, unless otherwise specified) Parameter Symbol Output Saturation Voltage (Sink) Test Condition Min Typ Max Unit 0.45 0.65 V VCC1.3 VCC1.0 VCC V VCC=20V, Output Open 13.5 16 mA VCC=14V, IO=200mA VSAT Output Saturation Voltage (Drive) Supply Current ICC VCC=14V, IO=200mA Output Rise Time tr RL=820Ω, CL=20pF 0.5 1.0 µs Output Fall Time tf RL=820Ω, CL=20pF 0.5 1.0 µs Magnetic Characteristics (TA=25oC) Parameter Symbol Operating Point BOP Releasing Point BRP Hysteresis Grade Min A 5 Typ Max Unit 70 B Gauss 100 A -70 B -100 BHYS -5 Gauss 70 Gauss Test Circuit AH477A VCC S 1 Marking Side DO DOB GND 2 3 4 VCC C1 0.1µF 820Ω N Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 5 Data Sheet SINGLE PHASE HALL EFFECT LATCH AH477A 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 Magnetism (GS) 0 50 100 Magnetism (GS) Figure 4. DO Output vs. Magnetism Figure 5. DOB Output vs. Magnetism Typical Performance Characteristics 20 16 14 16 12 ICC (mA) ICC (mA) 10 8 6 12 8 4 4 0 VCC=14V o TA=25 C 2 0 2 4 6 8 10 12 14 16 18 0 20 -20 -10 0 10 20 30 40 50 60 70 80 O VCC (V) TA ( C) Figure 7. Supply Current vs. Ambient Temperature Figure 6. Supply Current vs. Supply Voltage Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 6 Data Sheet SINGLE PHASE HALL EFFECT LATCH AH477A 100 100 80 80 60 60 40 20 BOP 0 BRP BOP/BRP/BHYS (GS) BOP/BRP/BHYS (GS) Typical Performance Characteristics (Continued) BHYS -20 20 BOP 0 BRP BHYS -20 -40 -40 -60 -60 o TA=25 C -80 -100 40 2 3 4 5 6 7 8 VCC=14V -80 -100 9 10 11 12 13 14 15 16 17 18 19 20 21 22 -20 -10 0 10 20 30 40 50 60 70 80 O TA ( C) VCC (V) Figure 8. BOP/BRP/BHYS vs. Supply Voltage Figure 9. BOP/BRP/BHYS vs. Ambient Temperature 1000 1200 900 1000 800 700 VSAT (mV) VSAT (V) 800 VSAT_Up 600 VSAT_Down 400 600 Driver Sink 500 400 300 200 O 200 TA=25 C IO=200mA 100 0 50 75 100 125 150 175 200 225 250 275 0 300 IO (mA) -20 0 20 40 60 80 o TA ( C) Figure 10. VSAT vs. IO Figure 11. VSAT vs. Ambient Temperature Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 7 Data Sheet SINGLE PHASE HALL EFFECT LATCH AH477A Typical Performance Characteristics (Continued) 800 PD (mW) 600 400 200 0 -25 0 25 50 75 100 125 150 o TA ( C) Figure 12. PD vs. Ambient Temperature Typical Application AH477A VCC 1 VCC DO DOB GND 2 3 4 D1 C1 0.1µF COIL Figure 13. Typical Application Circuit Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 8 Data Sheet SINGLE PHASE HALL EFFECT LATCH AH477A Mechanical Dimensions TO-94 0.500(0.020) 0.700(0.028) Unit: mm(inch) 45 °TYP 3.780(0.149) 4.080(0.161) 1.520(0.059) 1.720(0.067) 0.700(0.028) 0.900(0.035) 4.980(0.196) 5.280(0.208) 0.360(0.014) 0.510(0.020) 1.720(0.068) 2.020(0.080) 1.100(0.043) 1.400(0.055) 0.380(0.015) 0.550(0.022) Package Sensor Location (For Hall IC) 3.450(0.136) 3.750(0.148) 0.360(0.014) 0.500(0.020) 14.000(0.550) 15.300(0.602) 1.270(0.050) TYP 3.710(0.146) 3.910(0.154) Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 9 BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein. 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