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| Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 General Description The AH9279 is a most advanced fan control and drive Hall IC manufactured by special CMOS process. This IC consists of voltage reference, Hall sensor, signal amplifier, wave shaping circuit, locked rotor detector, locked rotor protection and restart circuit, output drive circuit, etc.. To allow survival in a harsh environment and in consideration of low cost, the AH9279 has been designed with many functions internally, and requires less external components. When there is no motion for one second, the IC will detect locked rotor conditions, enter protection mode automatically and disable two outputs for five seconds. Then, it will turn on drive current from one channel for one second. If it still fails to detect fan rotation, the AH9279 will shut off the outputs for five seconds again. This sequence will be repeated until rotation condition is detected and the IC enters normal operation mode. This function prevents the chip from overheating and damage due to long time locked rotor. The power dissipation decides allowable maximum ambient temperature. Low power dissipation of AH9279 and the output MOSFET power transistor enable it to be used at ambient temperature up to 125C on condition that the drive power is lower than 100mW or drive current is less than 200mA. The AH9279 is available in TO-94 package. Features * * * * * * * On Chip Hall Sensor Built-in Zener Diodes Protection for Output Driver Power Efficient CMOS and Power MOSFET Drivers Allow 400mA Without Overheating 5V, 12V and 24V Operation High Sensitivity for Switching Symmetry Locked Rotor Shutdown and Auto Restart ESD Rating: 4000V(Human Body Model) 400V(Machine Model) Applications * Dual-coil Brushless DC Fan TO-94 Figure 1. Package Type of AH9279 Apr. 2009 Rev. 1. 0 1 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Pin Configuration Z4 Package (TO-94) 4 3 2 1 GND DOB DO VDD Figure 2. Pin Configuration of AH9279 (Front View) Pin Description Pin Name VDD DO DOB GND Pin Number 1 2 3 4 Power supply pin Output pin 1 Output pin 2 Ground pin Function Apr. 2009 Rev. 1. 0 2 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Functional Block Diagram VDD 1 Regulator Lock Shutdown and Automatic Recovery 2 DO Hall Plate Amp Control Logic 3 DOB 4 GND Figure 3. Functional Block Diagram of AH9279 Ordering Information AH9279 - Circuit Type Package Z4: TO-94 Package TO-94 G1: Green Temperature Range -20 to 125C Part Number AH9279Z4-G1 Marking ID 9279Z4-G1 Packing Type Bulk BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Apr. 2009 Rev. 1. 0 3 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Absolute Maximum Ratings (TA=25C, Note 1) Parameter Supply Voltage Supply current (Fault) Output current Power dissipation Thermal Resistance (Junction to Ambient) Symbol VCC ICC IOUT PD JA Value 28 5 500 550 227 -55 to 150 4000 400 Unit V mA mA mW C/W C V V Storage Temperature ESD (Human Body Model) ESD (Machine Model) TSTG ESD ESD 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. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Parameter Supply Voltage Ambient Temperature Symbol VCC TA Min 3.5 -20 Max 24 125 Unit V C Apr. 2009 Rev. 1. 0 4 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Electrical Characteristics VCC =12V, TA =25C, unless otherwise specified. Parameter Supply Voltage Supply Current Output Current Output Leakage Current Saturation Voltage Output ON Time Output OFF Time Thermal Resistance (Junction to Case) Symbol VCC ICC IOUT ILEAKAGE VSAT tON tOFF JC Conditions Operating Average Min 3.5 Typ Max 24 (Note 2) Unit V mA mA A mV S S 3.5 5 500 VOUT=24V IOUT =350mA 0.1 600 0.8 5 49 10 1000 C/W Note 2: It is recommended to add a 680 resistor at VDD if the supply voltage is 24V. Magnetic Characteristics VCC =12V, TA =25C, unless otherwise specified. Parameter Operating Point Releasing Point Hysteresis Symbol BOP BRP BHYS Min -50 Typ 25 -25 50 Max 50 Unit Gauss Gauss Gauss Apr. 2009 Rev. 1. 0 5 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Test Circuit VDD S 1 AH9279 2 3 4 RL1 GND C3 DO RL2 Marking Side DOB N R1 C1 R2 C2 Figure 4. Basic Test Circuit of AH9279 DO( V) VCC 12 DOB(V) 12 V CC 10 10 8 8 6 6 4 4 2 2 VSAT 0 -40 -20 0 20 40 V SAT -40 -20 0 0 20 40 Magnetic Flux Density B(GS) Magnetic Flux Density B(GS) Figure 5. VDO vs. Magnetic Flux Density Figure 6. VDOB vs. Magnetic Flux Density Apr. 2009 Rev. 1. 0 6 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Typical Performance Characteristics 5.0 4.5 6.0 5.5 5.0 Supply Current (mA) Supply Current (mA) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 TA=25 C 4 6 8 10 12 14 16 18 20 O 1.0 0.5 0.0 -20 0 20 40 60 o TA=25 C VCC=12V 80 100 120 o Supply Voltage (V) Ambient Temperature ( C) Figure 7. Supply Current vs. Supply Voltage Figure 8. Supply Current vs. Ambient Temperature 100 900 800 BOP/BRP/BHYS (Gauss) 50 Saturation Voltage (mV) 700 600 500 400 300 200 0 BOP -50 BRP BHYS 4 6 8 10 12 14 16 TA=25 C O VCC=12V IOUT=350mA -20 0 20 40 60 O 18 20 80 100 120 Supply Voltage (V) Ambient Temperature ( C) Figure 9. BOP/BRP/BHYS vs. Supply Voltage Figure 10. Saturation Voltage vs. Ambient Temperature Apr. 2009 Rev. 1. 0 7 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Typical Performance Characteristics (Continued) 1200 600 Power Dissipation (mW) 1000 500 Saturation Voltage (mV) 800 400 600 300 400 TA=25 C VCC=12V O 200 200 100 0 100 200 300 400 500 0 -25 0 25 50 75 100 O 125 150 Output Current (mA) Ambient Temperature ( C) Figure 11. Saturation Voltage vs. Output Current Figure 12. Power Dissipation vs. Ambient Temperature 40 30 BOP/BRP/BHYS (Gauss) 20 10 0 -10 -20 -30 -40 -20 0 20 40 60 80 O BOP BRP BHYS 100 120 Ambient Temperature ( C) Figure 13. BOP/BRP/BHYS vs Ambient Temperature Apr. 2009 Rev. 1. 0 8 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Typical Application 12V VDD D1 AH9279 1 2 3 4 L2 GND L1 C3 DO DOB C2 C1 C1=C2=C3=2.2F typical The value of the capacitor need to be fine tuned based on coils design. Figure 14. Typical Application of AH9279 (12V Brushless DC Fan) 24V VDD D1 AH9279 R1 1 2 3 4 L2 GND L1 C3 DO DOB C2 C1 R1=680 C1=C2=C3=2.2F/50V Figure 15. Typical Application of AH9279 (24V Brushless DC Fan) Apr. 2009 Rev. 1. 0 9 BCD Semiconductor Manufacturing Limited Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Mechanical Dimensions TO-94 45 TYP Unit: mm(inch) 0.500(0.020) 0.700(0.028) 1.520(0.059) 1.720(0.067) 0.700(0.028) 0.900(0.035) 2.000(0.079) 2.300(0.091) 1.100(0.043) 1.400(0.055) 3.780( 0.149) 4.080( 0.161) 4.980(0.196) 5.280(0.208) 0.360(0.014) 0.510(0.020) 0.380(0.015) 0.550(0.022) 3.450(0.136) 3.750(0.148) 0.360(0.014) 0.500(0.020) 14.900(0.587) 15.300(0.602) 3.710(0.146) 3.910(0.154) 1.270(0.050) TYP Apr. 2009 Rev. 1. 0 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. 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