Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH General Description Features The AH277A is an integrated Hall sensor with output driver designed for electronic commutation of brushless DC motor applications. The device includes an onchip Hall sensor for magnetic sensing, an amplifier that amplifies the Hall voltage, a Schmitt trigger to provide switching hysteresis for noise rejection, a temperature compensation circuit to compensate the temperature drift of Hall sensitivity and two complementary open-collector drivers for sinking large load current. It also includes an internal band-gap regulator which is used to provide bias voltage for internal circuits. · · · · · · · AH277A On-Chip Hall Sensor 3.5V to 16V Supply Voltage 400mA (avg) Output Sink Current Reversed Supply Voltage Protection -20oC to 85oC Operating Temperature Low Profile TO-94 (SIP-4L) Package ESD Rating: 300V (Machine Model) Applications · · · · Placing the device in a variable magnetic field, if the magnetic flux density is larger than threshold BOP, the pin DO will be turned low (on) and pin DOB will be turned high (off). This output state is held until the magnetic flux density reverses and falls below BRP, then causes DO to be turned high (off) and DOB turned low (on). Dual-Coil Brushless DC Motor Dual-Coil Brushless DC Fan Revolution Counting Speed Measurement AH277A is available in TO-94 (SIP-4L) package. TO-94 Figure 1. Package Type of AH277A Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 1 Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A Pin Configuration Z4 Package (TO-94) 4 GND 3 2 DOB DO 1 VCC Figure 2. Pin Configuration of AH277A (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. 6 BCD Semiconductor Manufacturing Limited 2 Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A Functional Block Diagram VCC DO 1 2 Temperature Compensation Regulator 4 Hall Sensor Schmitt Trigger Amplifier GND Output Driver 3 DOB Figure 3. Functional Block Diagram of AH277A Ordering Information AH277A E1: Lead Free G1: Green Circuit Type Magnetic Characteristics A: 10 to 50Gauss B: 5 to 70Gauss C: 100Gauss Package Z4: TO-94 (SIP-4L) Package TO-94 Temperature Range -20 to 85o C Part Number Lead Free Marking ID Green Lead Free Green Packing Type AH277AZ4-AE1 AH277AZ4-AG1 AH277A AH277A-G1 Bulk AH277AZ4-BE1 AH277AZ4-BG1 AH277A AH277A-G1 Bulk AH277AZ4-CE1 AH277AZ4-CG1 AH277A AH277A-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. Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 3 Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A Absolute Maximum Ratings (Note 1) (TA=25oC) Parameter Symbol Value Unit Supply Voltage VCC 20 V Reverse Protection Voltage VRCC -20 V B Unlimited Gauss 400 mA 600 mA 800 mA PD 550 mW Die to atmosphere θJA 227 Die to package case θJC 49 TSTG -50 to 150 Magnetic Flux Density Continuous Output Current IO Hold Peak (start up) Power Dissipation Thermal Resistance Storage Temperature o C/W oC/W o C ESD (Machine Model) 300 V ESD (Human Body Model) 2000 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 VCC 3.5 16 V TA -20 85 o Oct. 2009 Rev. 1. 6 Unit C BCD Semiconductor Manufacturing Limited 4 Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A Electrical Characteristics (TA=25oC, VCC=14V, unless otherwise specified) Parameter Symbol VSAT Output Saturation Voltage Test Condition Min Typ VCC=3.5V, IO=100mA 0.4 IO=400mA 0.35 Output Leakage Current IOL VCE=16V Supply Current ICC VCC=16V, Output Open Max Unit V 0.6 V 0.1 10 µA 12 16 mA Output Rise Time tr RL=820Ω, CL=20pF 3.0 10 µs Output Fall Time tf RL=820Ω, CL=20pF 0.3 1.5 µs Switch Time Differential ∆t RL=820Ω, CL=20pF 3.0 10 µs Output Zener Breakdown Voltage VZ 55 V Magnetic Characteristics (TA=25oC) Parameter Symbol BOP Operating Point Grade Min Typ Max Unit A 10 30 50 Gauss B 5 70 Gauss 100 Gauss -10 Gauss -5 Gauss C BRP Releasing Point Hysteresis A -50 B -70 C -100 -30 Gauss 60 BHYS Gauss VDO (V) Off-state High BHYS Turn off Turn on Low VSAT On-state N BRP 0 BOP S Magnetic Flux Density (Gauss) Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 5 Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A Magnetic Characteristics (Continued) +14V AH277A S Marking Side VCC DO 1 2 DOB GND 4 3 DO (VOUT1) R1 820Ω R2 N DOB (VOUT2) 820Ω C1 C2 20pF 20pF Figure 4. Basic Test Circuit DO (V) DOB (V) 16 16 VCC 14 14 12 12 10 10 8 8 6 6 4 4 2 -40 -20 0 VSAT 20 2 VSAT 40 -40 Magnetic Flux Density B (Gauss) VCC -20 0 20 40 Magnetic Flux Density B (Gauss) Figure 5. VDO vs. Magnetic Flux Density Figure 6. VDOB vs. Magnetic Flux Density Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 6 Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A Typical Performance Characteristics 14 60 12 50 40 BOP, BRP, BHY (Gauss) 10 ICC (mA) 8 6 o TA= -20 C o TA= 0 C 4 o 20 BOP BRP BHYS 10 0 TA=25 C -10 TA=80 C -20 o 2 0 30 -30 0 5 10 15 20 25 0 5 10 15 20 25 VCC (V) VCC (V) Figure 7. ICC vs. VCC Figure 8. BOP/BRP/BHYS vs. VCC 800 60 50 600 30 PD (mW) BOP, BRP, BHYS (Gauss) 40 20 BOP BRP BHYS 10 0 400 200 -10 -20 -20 -10 0 10 20 30 40 50 60 70 80 90 0 -25 100 110 o 0 25 50 75 100 125 150 o TA ( C) TA ( C) Figure 9. BOP/BRP/BHYS vs. Ambient Temperature Figure 10. PD vs. Ambient Temperature Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 7 Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A Typical Performance Characteristics (Continued) 14 600 IO=300mA IO=350mA IO=400mA VCC=14V 550 12 500 VSAT (mV) ICC (mA) 450 10 VCC=3.5V VCC=14V VCC=20V 8 6 -20 0 400 350 300 250 20 40 60 200 80 -20 0 20 o 40 60 80 o TA ( C) TA ( C) Figure 11. Supply Current vs. Ambient Temperature Figure 12. Saturation Voltage vs. Ambient Temperature Typical Applications D1 AH277A VCC DO 1 2 COIL1 COIL2 R1 470 R2 470 DOB GND 4 3 VCC + C1 2.2µF + C2 2.2µF Figure 13. Typical Application Circuit with D1(Note 2) Note 2: AH277A has Reversed Supply Voltage Protection. For DC fan application, sometimes need to test power reverse connection condition. The internal diode only protects chip-side but not for coil-side. It is recommended to add one external diode D1 in application to block the reverse current from coil-side as shown in Figure 13. Oct. 2009 Rev. 1. 6 BCD Semiconductor Manufacturing Limited 8 Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH AH277A Mechanical Dimensions TO-94 0.500(0.020) 0.700(0.028) 3.780(0.149) Unit: mm(inch) 45°TYP 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) 1.850(0.073) 1.250(0.050) Package Sensor Location 0.380(0.015) 0.550(0.022) 3.450(0.136) 3.750(0.148) (For Hall IC) 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. 6 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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