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| Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH General Description 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. 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). AH277A is available in TO-94 (SIP-4L) package. AH277A Features * * * * * * * 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 * * * * Dual-Coil Brushless DC Motor Dual-Coil Brushless DC Fan Revolution Counting Speed Measurement TO-94 Figure 1. Package Type of AH277A Jul. 2006 Rev. 1. 2 1 BCD Semiconductor Manufacturing Limited Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH Pin Configuration Z4 Package (TO-94) AH277A 4 3 2 1 GND DOB DO VCC Figure 2. Pin Configuration of AH277A (Top View) Pin Description Pin Number 1 2 3 4 Pin Name VCC DO DOB GND Supply voltage Output 1 Output 2 Ground Function Jul. 2006 Rev. 1. 2 2 BCD Semiconductor Manufacturing Limited Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH Functional Block Diagram VCC 1 DO 2 AH277A Regulator Temperature Compensation 4 GND Hall Sensor Amplifier Schmitt Trigger Output Driver 3 DOB Figure 3. Functional Block Diagram of AH277A Ordering Information AH277A Circuit Type Package Z4: TO-94 (SIP-4L) E1: Lead Free Magnetic Characteristics A: 10 to 50Gauss B: 5 to 70Gauss C: 100Gauss Package TO-94 Temperature Range oC Part Number AH277AZ4-AE1 AH277AZ4-BE1 AH277AZ4-CE1 Marking ID AH277A AH277A AH277A Packing Type Bulk Bulk Bulk -20 to 85 BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Jul. 2006 Rev. 1. 2 3 BCD Semiconductor Manufacturing Limited Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH Absolute Maximum Ratings (Note 1) (TA=25oC) Parameter Supply Voltage Reverse Protection Voltage Magnetic Flux Density Continuous Output Current Hold Peak (start up) Power Dissipation Die to atmosphere Thermal Resistance Die to package case Storage Temperature ESD (Machine Model) ESD (Human Body Model) PD JA JC TSTG IO Symbol VCC VRCC B Value 20 -20 Unlimited 400 600 800 550 227 49 -50 to 150 300 2000 Unit V V Gauss mA mA mA mW oC/W oC/W oC AH277A 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 16 85 Unit V o C Jul. 2006 Rev. 1. 2 4 BCD Semiconductor Manufacturing Limited Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH Electrical Characteristics (TA=25oC, VCC=14V, unless otherwise specified) Parameter Output Saturation Voltage Output Leakage Current Supply Current Output Rise Time Output Fall Time Switch Time Differential Output Zener Breakdown Voltage Symbol VSAT IOL ICC tr tf t VZ Test Condition VCC=3.5V, IO=100mA IO=400mA VCE=16V VCC=16V, Output Open RL=820, CL=20pF RL=820, CL=20pF RL=820, CL=20pF Min Typ 0.4 0.35 0.1 12 3.0 0.3 3.0 55 0.6 10 16 10 1.5 10 Max Unit V V A mA s s s V AH277A Magnetic Characteristics (TA=25oC) Parameter Operating Point Symbol BOP Grade A B C A Releasing Point BRP B C Hysteresis BHYS -50 -70 -100 60 -30 Min 10 5 Typ 30 Max 50 70 100 -10 -5 Unit Gauss Gauss Gauss Gauss Gauss Gauss Gauss VDO (V) Off-state High Turn off BHYS Turn on VSAT On-state N BRP 0 BOP Low S Magnetic Flux Density (Gauss) Jul. 2006 Rev. 1. 2 5 BCD Semiconductor Manufacturing Limited Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH Magnetic Characteristics (Continued) AH277A +14V AH277A VCC S Marking Side DO DOB GND 1 2 3 4 DO (VOUT1) DOB (VOUT2) R1 820 R2 N 820 C1 C2 20pF 20pF Figure 4. Basic Test Circuit DO (V) 16 DOB (V) 16 14 12 10 8 6 4 2 -20 0 20 40 VCC 14 12 10 8 6 4 2 VCC VSAT 20 40 VSAT -40 -40 -20 0 Magnetic Flux Density B (Gauss) Magnetic Flux Density B (Gauss) Figure 5. VDO vs. Magnetic Flux Density Figure 6. VDOB vs. Magnetic Flux Density Jul. 2006 Rev. 1. 2 6 BCD Semiconductor Manufacturing Limited Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH Typical Performance Characteristics AH277A 14 60 12 50 40 BOP, BRP, BHY (Gauss) 10 30 20 10 0 -10 -20 -30 ICC (mA) 8 6 TA= -20 C o 4 TA= 0 C TA=25 C o o o BOP BRP BHYS 2 TA=80 C 0 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 60 50 40 800 600 BOP, BRP, BHYS (Gauss) 30 20 10 0 -10 -20 -20 -10 0 10 20 30 40 o PD (mW) 50 60 70 80 90 100 110 400 BOP BRP BHYS 200 0 -25 0 25 50 75 100 125 150 TA ( C) TA ( C) o Figure 9. BOP/BRP/BHYS vs. Ambient Temperature Figure 10. PD vs. Ambient Temperature Jul. 2006 Rev. 1. 2 7 BCD Semiconductor Manufacturing Limited Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH Typical Performance Characteristics (Continued) 300 AH277A 250 JC, JA ( C/W) o 200 150 100 JC JA 50 0 -30 -15 0 15 30 45 60 75 90 TA ( C) o Figure 11. Thermal Resistance vs. Ambient Temperature Typical Applications D1 AH277A COIL1 VCC DO DOB GND COIL2 1 2 3 4 VCC + R1 470 C1 2.2F + R2 470 C2 2.2F Figure 12. 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 12. Jul. 2006 Rev. 1. 2 8 BCD Semiconductor Manufacturing Limited Data Sheet COMPLEMENTARY OUTPUT HALL EFFECT LATCH Mechanical Dimensions TO-94 0.500(0.020) 0.700(0.028) 1.400(0.055) 1.800(0.071) 4.980(0.196) 5.280(0.208) 1.850(0.073) 0.360(0.014) 0.510(0.020) 3.780(0.149) 4.080(0.161) 45TYP AH277A Unit: mm(inch) 0.700(0.028) 0.900(0.035) 1.250(0.050) Hall Sensor Location 0.380(0.015) 0.550(0.022) 0.360(0.014) 0.500(0.020) 14.900(0.587) 15.300(0.602) 1.270(0.050) TYP 3.710(0.146) 3.910(0.154) Jul. 2006 Rev. 1. 2 9 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 BCD Semiconductor Manufacturing Limited - Wafer Fab Shanghai SIM-BCD Semiconductor Manufacturing Limited 800, Yi Shan Road, Shanghai 200233, China Tel: +86-21-6485 1491, Fax: +86-21-5450 0008 BCD Semiconductor Manufacturing Limited - IC Design Group Advanced Analog Circuits (Shanghai) Corporation 8F, Zone B, 900, Yi Shan Road, Shanghai 200233, China Tel: +86-21-6495 9539, Fax: +86-21-6485 9673 REGIONAL SALES OFFICE Shenzhen Office Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd. Shenzhen Office Advanced Analog Circuits (Shanghai) Corporation Shenzhen Office 27B, Tower C, 2070, Middle Shen Nan Road, Shenzhen 518031, China Tel: +86-755-8368 3987, Fax: +86-755-8368 3166 Taiwan Office BCD Semiconductor (Taiwan) Company Limited 4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei, Taiwan Tel: +886-2-2656 2808, Fax: +886-2-2656 2806 USA Office BCD Semiconductor Corporation 3170 De La Cruz Blvd., Suite 105, Santa Clara, CA 95054-2411, U.S.A Tel: +1-408-988 6388, Fax: +1-408-988 6386 |
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