FAN8727 Fairchild Semiconductor, FAN8727 Datasheet
FAN8727
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FAN8727 Summary of contents
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... Car Mini Disk Player • Car Navigation System ©2002 Fairchild Semiconductor Corporation www.fairchildsemi.com Description The FAN8727 is a monolithic integrated circuit suitable for a 4-CH motor driver which drives the tracking actuator, focus actuator, sled motor, loading motor and 3-phase BLDC spindle motor of the MDP/CAR-MD/CAR-NAVIGATION system. ...
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... FAN8727 Pin Assignments ECR VCC2 PC1 6 7 SIGGND VM 8 CS1 DIR FAN8727 DO4 + 35 DO4 AVM3 34 DO3 + 33 32 DO3 BTLPGND2 31 30 BTLPGND1 29 DO2 + 28 DO2 DO1 + 27 26 DO1 DI1 ...
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... BTL Drive Input 4 I BTL Drive Input 3 I BTL Drive Input 2 I BTL Drive Input 1 O BTL Drive 1 Output (-) O BTL Drive 1 Output (+) O BTL Drive 2 Output (-) O BTL Drive 2 Output (+) - BTL Power Ground 1 - BTL Power Ground 2 O BTL Drive 3 Output (-) O BTL Drive 3 Output (+) FAN8727 3 ...
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... FAN8727 Pin Definitions (Continued) Pin Number Pin Name 34 AVM3 35 DO4- 36 DO4+ 37 MUTE4 38 MUTE3 39 MUTE12 40 AVM4 41 BIAS 42 BTLSGND 43 H1- 44 H1+ 45 H2- 46 H2+ 47 H3- 48 H3+ 4 I/O Pin Function Description - BTL CH3 Motor Supply Voltage O BTL Drive 4 Output (-) O BTL Drive 4 Output (+) I BTL Drive Mute CH4 ...
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... Internal Block Diagram Hall Bias 2 FG Generator 3 TSD Absolute Values Current Sense Amp Output Current Limit 7 8 Short 9 Brake Hall Amp AVM4 Detection Logic AVM3 Reverse Rotation AVM12 AVM12 Distributor FAN8727 5 ...
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... FAN8727 Equivalent Circuits Hall Bias 1 Torque Control Reference & Signal 3 4 25 1K Current Detector 9 5K 6 100K Phase Compensation Capacitor FG Signal Output 10K 2 25 6 25 1K Start/Stop 100K 10 50K 25 30K ...
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... Equivalent Circuits (Continued) 3-Phase Rotational Direction Output 10K 25 3-Phase Output 15K OP-AMP Ouput Short Brake 12 1k 25 20k OP-AMP Input 2K 2K 25 1K 1K 25 2K 2K BTL Drive Input 25 50 FAN8727 18 7 ...
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... FAN8727 Equivalent Circuits (Continued) BTL Drive Output 20K 30K BTL Bias Voltage 41 25 0.5K 25 47 BTL Drive Mute 37 38 25 50K 39 30K Hall Input 1K 1K 25 ...
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... Symbol V CC1max V CC2max V Mmax V MBTLmax Pd Topr Tstg I OMAXS I OMAXB 1.6mm PCB (Phenolic resin material) 75 100 125 150 175 Symbol V CC1 V CC2 note MBTL FAN8727 Value Unit note 3.0 W -35 ~ +85 C -55 ~ +150 C 1 Ambient Temperature Min. Typ. Max. Unit 4.5 - 13.2 4 ...
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... FAN8727 Electrical Characteristics Parameter Circuit Current 1 Circuit Current 2 START/STOP On Voltage Range Off Voltage Range HALL BIAS Hall Bias Voltage HALL AMP Hall Bias Current In-Phase in Voltage Range note Minimum in Level TORQUE CONTROL In Voltage Range note Offset Voltage (-) Offset Voltage (+) In Current In/Output Gain ...
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... RR V =0.1Vrms, 120kHz IN SR 120Hz, 2Vpp V Pin37, 38 Variation MOFFCH V Pin37, 38 Variation MONCH OH1 V - OL1 I - SINK I - SOU1 G f=1kHz -75dB VO1 IN RR1 f=120Hz -20dB IN SR1 f=120Hz, 2Vp-p CMRR1 f=1kHz -20dB IN FAN8727 Min. Typ. Max. Unit - - 9.5 10 10.5 12.0 13 1 1 - 600 nA 11 ...
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... FAN8727 Calculation of Gain & Torque Limit Current Current / Voltage Convertor + EC Gm ECR Absolute Values 0.255 which is made from GM times R1 is fixed value within IC. 0.255 Gain = -------------- - R S Vmax (see above block diagram) is setted to 350mV. Vmax 350 mV Itl mA = --------------- - = ----------------------- - Negative Feedback loop Vin Driver ...
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... When the input signal Vin, through the pin (pin 22, 23, 24 and 25) is below the Vbias, then the motor (actuator forward direction. 2.5[V] Above Mute Function Operation OPEN or 0.5[V] Below VCC Q1 DRIVE M AMP GND 41 + LEVEL AMP1 SHIFT 10k FAN8727 Normal Operation Q2 DRIVE AMP ...
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... FAN8727 - When the input signal Vin, through the pin (pin 22, 23, 24 and 25) is above the Vbias, then the motor (actuator reverse direction you want to change the gain, then modify the external resistor's value (Rextern) 3. Torque & Output Current Control Torque Control & Output Current Control ...
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... IC. To remove these shortcomings and to enhance efficiency, the short brake function is added to FAN8727. When the short brake function is active, all upper Power transistors are turned off and the lower Power transistors turned on reduce the rota- tional velocity of the motor ...
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... FAN8727 6. Thermal Shutdown (Tsd) Function When the junction temperature rises up to about 175 C, then the output drive circuit is shut down, when the junction tempera- ture falls off to about 160 C, the output drive circuit will be normally operated. It has the temperature hysteresis of about 15 C. ...
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... MD from rotating in the reverse direction, a reverse rotation resistant function is required. Its operational principles are discussed below. Rotation H2 Forward H Reverse L Current Sense Amp Q Gain Controller >E is sometimes controlled to retard and/or stop the MD. As the D-F FAN8727 ( b) Driver M Reverse Rotation Preventer E <E E > Forward Brake and Stop - Stop 17 ...
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... FAN8727 9. FG Output Function The FG output, which detects the number of rotations of the MD, is generated by combination zero-crossing the output wave- forms of the hall sensors. The FG output circuit is as shown below 10. Hall Sensor Connection External Hall sensors are used in series or parallel connection as shown below. ...
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... After the signal is converted to a current in the amplitude control circuit, the current is supplied to the output driver, which then provides a motor drive current. The phases of the hall input signal, output voltage, and output current are shown below output current A1 output voltage A2 output current A2 output voltage A3 output current A3 output voltage FAN8727 19 ...
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... ECR VCC2 6 PC1 7 SIGGND CS1 DIR OPIN (+) SW5 IN3 IN1 12V 2. BTLPGND2 FAN8727 BTLPGND1 12V 10 F BTL SVCC 12V OPIN ( ) SW6 IN3 37 V RL4’ 36 DO4+ RL4 SW4 35 DO4 12V AVM3 DO3+ 33 SW3 RL3’ DO3 32 RL3 RL2 30 SW2 29 DO2+ DO2 ...
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... Spindle Motor Drive Part SW14 5V A SW15 12V V V SW17 IFR SW18 H3+ H3 H2 SW12 SW13 3 ECR VCC2 6 PC1 7 SIGGND CS1 SW16 DIR VSB SW19 SW20 BTLPGND2 FAN8727 BTLPGND1 FAN8727 36 DO4+ DO4 35 34 AVM3 33 DO3+ 32 DO3 DO2+ 28 DO2 27 DO1+ 26 DO1 25 DI1 21 ...
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... SERVO 3 ECR TORQUE CONTROL VCC2 VCC 6 PC1 0 SIGGND 12V 8 VM CS1 9 SYSTEM SS 10 CONTROL ROTATE 11 DIR DIRECTION 12 SB SHORT BREAK FAN8727 VCC + DO4+ TRAY MOTOR 35 DO4 AVM3 34 +5V DO3+ 33 SLED MOTOR DO3 32 31 BTLPGND2 30 BTLPGND1 29 DO2+ FOCUS ACTUATOR DO2 28 DO1+ 27 TRACKING ...
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... FAN8727 23 ...
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... FAN8727 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. ...