Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER General Description Features 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. AH9279 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 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 125°C 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. TO-94 Figure 1. Package Type of AH9279 Apr. 2009 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Pin Configuration Z4 Package (TO-94) GND 4 3 DOB 2 DO 1 VDD Figure 2. Pin Configuration of AH9279 (Front View) Pin Description Pin Name Pin Number VDD 1 Power supply pin DO 2 Output pin 1 DOB 3 Output pin 2 GND 4 Ground pin Apr. 2009 Function Rev. 1. 0 BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Functional Block Diagram VDD 1 Lock Shutdown and Automatic Recovery Regulator Hall Plate 2 DO Control Logic Amp 3 DOB 4 GND Figure 3. Functional Block Diagram of AH9279 Ordering Information AH9279 - G1: Green Circuit Type Package Z4: TO-94 Package Temperature Range TO-94 -20 to 125°C 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 BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Absolute Maximum Ratings (TA=25°C, Note 1) Parameter Symbol Value Unit Supply Voltage VCC 28 V Supply current (Fault) ICC 5 mA Output current IOUT 500 mA Power dissipation PD 550 mW Thermal Resistance (Junction to Ambient) θJA 227 °C/W Storage Temperature TSTG -55 to 150 °C ESD (Human Body Model) ESD 4000 V ESD (Machine Model) ESD 400 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. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. Recommended Operating Conditions Parameter Symbol Min Max Unit Supply Voltage VCC 3.5 24 V Ambient Temperature TA -20 125 °C Apr. 2009 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Electrical Characteristics VCC =12V, TA =25°C, unless otherwise specified. Parameter Symbol Conditions Supply Voltage VCC Operating Supply Current ICC Average Output Current IOUT Output Leakage Current Saturation Voltage ILEAKAGE VSAT Min Typ 3.5 3.5 Max Unit 24 (Note 2) V 5 mA 500 mA VOUT=24V 0.1 10 µA IOUT =350mA 600 1000 mV Output ON Time tON 0.8 S Output OFF Time tOFF 5 S Thermal Resistance (Junction to Case) θJC 49 °C/W Note 2: It is recommended to add a 680Ω resistor at VDD if the supply voltage is 24V. Magnetic Characteristics VCC =12V, TA =25°C, unless otherwise specified. Parameter Symbol Operating Point BOP Releasing Point BRP Hysteresis BHYS Apr. 2009 Min -50 Rev. 1. 0 Typ Max Unit 25 50 Gauss -25 Gauss 50 Gauss BCD Semiconductor Manufacturing Limited 5 Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Test Circuit VDD AH9279 S 2 1 3 4 Marking Side RL1 RL2 R1 R2 C1 C2 GND C3 DOB DO N Figure 4. Basic Test Circuit of AH9279 DO( V) VCC DOB(V) 12 12 10 10 8 8 6 6 4 4 2 2 VSAT 0 -40 -20 0 20 V SAT 0 40 -40 Magnetic Flux Density B(GS) -20 0 20 40 Magnetic Flux Density B(GS) Figure 5. VDO vs. Magnetic Flux Density Apr. 2009 V CC Figure 6. VDOB vs. Magnetic Flux Density Rev. 1. 0 BCD Semiconductor Manufacturing Limited 6 Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Typical Performance Characteristics 6.0 5.0 5.5 5.0 4.0 Supply Current (mA) Supply Current (mA) 4.5 3.5 3.0 2.5 4.0 3.5 3.0 2.5 2.0 1.5 2.0 TA=25 C 6 8 10 12 14 16 18 VCC=12V 0.5 0.0 4 o TA=25 C 1.0 O 1.5 1.0 4.5 20 -20 0 20 40 60 80 100 120 o Ambient Temperature ( C) Supply Voltage (V) Figure 7. Supply Current vs. Supply Voltage Figure 8. Supply Current vs. Ambient Temperature 100 900 Saturation Voltage (mV) BOP/BRP/BHYS (Gauss) 800 50 0 BOP 600 500 400 VCC=12V O TA=25 C BRP -50 700 300 IOUT=350mA BHYS 200 4 6 8 10 12 14 16 18 20 0 20 40 60 80 100 120 O Figure 9. BOP/BRP/BHYS vs. Supply Voltage Apr. 2009 -20 Ambient Temperature ( C) Supply Voltage (V) Figure 10. Saturation Voltage vs. Ambient Temperature Rev. 1. 0 BCD Semiconductor Manufacturing Limited 7 Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Typical Performance Characteristics (Continued) 1200 600 Power Dissipation (mW) Saturation Voltage (mV) 1000 800 600 400 O TA=25 C VCC=12V 200 0 100 200 300 500 400 300 200 100 400 0 -25 500 0 25 50 75 100 125 150 O Ambient Temperature ( C) Output Current (mA) Figure 11. Saturation Voltage vs. Output Current Figure 12. Power Dissipation vs. Ambient Temperature 40 BOP/BRP/BHYS (Gauss) 30 20 10 0 BOP -10 BRP -20 BHYS -30 -40 -20 0 20 40 60 80 100 120 O Ambient Temperature ( C) Figure 13. BOP/BRP/BHYS vs Ambient Temperature Apr. 2009 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 8 Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 Typical Application D1 VDD 12V AH9279 1 2 3 4 L2 L1 C2 C1 GND C3 DOB DO C1=C2=C3=2.2µF 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) D1 VDD 24V AH9279 1 R1 2 3 4 L2 L1 C2 C1 GND C3 DOB DO R1=680Ω C1=C2=C3=2.2µF/50V Figure 15. Typical Application of AH9279 (24V Brushless DC Fan) Apr. 2009 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 9 Preliminary Datasheet TWO PHASE DUAL-COIL CMOS SMART FAN MOTOR DRIVER AH9279 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) 2.000(0.079) 2.300(0.091) 1.100(0.043) 1.400(0.055) 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) Apr. 2009 Rev. 1. 0 1.270(0.050) TYP 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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