FAN8741/FAN8742 Spindle Motor and 6-CH Driver [Spindle(PWM), Sled 2-CH(PWM) 4-CH(Linear)] Features Description Common Suitable for a 3-phase BLDC (Brush-Less Direct Current) spindle motor driver with PWM, the monolithic FAN8741/FAN8742 IC also includes 2-ch motor drivers with PWM for sled motors and 4-ch linear drivers which drive the focus actuator, tracking actuator, tilt actuator, and loading motor in optical media applications. Designed specifically for high-speed/high-density optical media applications, the FAN8741/FAN8742’s power stage is created by D-MOS transistors which have extremely low RDSON. This enables less heat generation and guarantees improved reliability. • Built-in thermal shutdown circuit (TSD) • 8 Independent voltage sources • Corresponds to 3.3V or 5V DSP • 4 selectable mute inputs Spindle • Output PWM mode control The FAN8741G/FAN8742G is available in a 56-SSOP-HS package, which has high-power dissipation and the leadframe is exposed to the top side. • FG output: open collector type • Selectable brake(short & reverse brake) • Built-in hall bias The FAN8741MTF/FAN8742MTF is available in a 56-TSSOP-EP package, which is very thin and the leadframe is exposed to the bottom side. • 180o commutation(compatible with conventional BLDC spindle motor) • Built in short-through protection function BTL(Sled 2-channels) • Output PWM mode control • Built in short-through protection function BTL(Other 4-channels) • Output linear mode control Ordering Information Typical Applications • CD-ROM • CD-RW • DVD-ROM • DVD-RAM • DVD Player (DVDP) • Other compact disk media Device Package Operating Temp. FAN8741G 56-SSOP-HS −25°C to +75°C FAN8741GX 56-SSOP-HS −25°C to +75°C FAN8742G 56-SSOP-HS −25°C to +75°C FAN8742GX 56-SSOP-HS −25°C to +75°C FAN8741MTF 56-TSSOP-EP −25°C to +75°C FAN8741MTFX 56-TSSOP-EP −25°C to +75°C 56-TSSOP-EP −25°C to +75°C FAN8742MTFX 56-TSSOP-EP −25°C to +75°C FAN8742MTF • Game consoles HS=HeatSlug, EP=ExposedPad X:Tape & Reel type FAN8741:FG3X FAN8742:FG1X ©2005 Fairchild Semiconductor Corporation FAN8741/FAN8742 Rev. 1.0.1 1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver April 2005 MUTE1 22 MUTE2 23 Mute Selection &Spindle brake sel. 50 DIR SVCC1 52 Reverse Detect DGND 56 2 HU+ Freguency Generator VCP OSC 3 HU− Hall Amp CP1 53 Spindle Direction CP2 54 Charge pump & Oscillator VDD 48 VCP 55 4 HV+ 5 HV− 6 HW+ 7 HW− IN3 47 Hall bias IN4 46 LPF 15 RSP2 DO4− 44 PWM Control 10k 20k OSC PGND5 45 BTL driver 10 U 12 V 14 W 13 PGND2 9 PGND1 49 SPIN 21 REF REF PVCC2 31 DO3+ 40 11 RSP1 Commutator & Power drive Level shift VCP DO4+ 43 8 VH 1 VM1 TSD PVCC3 42 DO3− 41 51 FG LPF BTL driver VCP 26 VM2 24 RSL1 H bridge 4 PWM Control PVCC1 32 16 SL1+ 17 SL1− OSC DO2− 39 DO2+ 38 DO1− 37 DO1+ 36 20 PGND3 BTL driver BTL driver PGND4 35 LPF VCP Flip Flop 10k 10k PWM Control 18 SL2+ Drive Logic 19 SL2− IOMAX OSC 25 RSL2 H-bridge 29 SLIN2 30 SLIN1 IN1 34 IN2 33 27 SVCC2 28 SGND 2 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver Internal Block Diagram(Pins numbered according to the FAN8741MTF--Leadframe exposed to the bottom) FAN8741/FAN8742 Spindle motor and 6-CH actuator driver Pin Assignments(Leadframe exposed to the bottom side) VM1 1 56 DGND HU+ 2 55 VCP HU- 3 54 CP2 HV+ 4 53 CP1 HV- 5 52 SVCC1 HW+ 6 51 FG HW- 7 50 DIR VH 8 49 SPIN PGND1 9 48 VDD U 10 47 IN3 RSP1 11 46 IN4 V 12 45 PGND5 PGND2 13 44 DO4- W 14 43 DO4+ RSP2 15 42 PVCC3 SL1+ 16 41 DO3- SL1- 17 40 DO3+ SL2+ 18 39 DO2- SL2- 19 38 DO2+ PGND3 20 37 DO1- REF 21 36 DO1+ MUTE1 22 35 PGND4 MUTE2 23 34 IN1 RSL1 24 33 IN2 RSL2 25 32 PVCC1 VM2 26 31 PVCC2 SVCC2 27 30 SLIN1 SGND 28 29 SLIN2 FAN8741MTF/ FAN8742MTF (PAD DOWN) 3 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver Pin Assignments(Leadframe exposed to the top side) DGND 1 56 VM1 VCP 2 55 HU+ CP2 3 54 HU- CP1 4 53 HV+ SVCC1 5 52 HV- FG 6 51 HW+ DIR 7 50 HW- SPIN 8 49 VH VDD 9 48 PGND1 IN3 10 47 U IN4 11 46 RSP1 PGND5 12 45 V DO4- 13 44 PGND2 DO4+ 14 43 W PVCC3 15 42 RSP2 DO3- 16 41 SL1+ DO3+ 17 40 SL1- 39 SL2+ 38 SL2- 37 PGND3 DO2DO2+ 18 19 FAN8741G/ FAN8742G (SHOULD THIS SAY “PAD UP” TO MATCH THE PREVIOUS PAGE?) DO1- 20 DO1+ 21 36 REF PGND4 22 35 MUTE1 IN1 23 34 MUTE2 IN2 24 33 RSL1 PVCC1 25 32 RSL2 PVCC2 26 31 VM2 SLIN1 27 30 SVCC2 SLIN2 28 29 SGND 4 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com Pin Number Pin Number (exposed to bottom) (exposed to top) 1 Pin Name I/O Pin Function Description 56 VM1 P Power supply for spindle 2 55 HU+ A Hall signal input(Hu+) 3 54 HU- A Hall signal input(Hu-) 4 53 HV+ A Hall signal input(Hv+) 5 52 HV- A Hall signal input(Hv-) 6 51 HW+ A Hall signal input(Hw+) 7 50 HW- A Hall signal input(Hw-) 8 49 VH A Hall bias 9 48 PGND1 P Power ground 1 for spindle channel 10 47 U A 3-phase output U for spindle 11 46 RSP1 A Spindle current sensing 1 12 45 V A 3-phase output V for spindle 13 44 PGND2 P Power ground 2 for spindle channel 14 43 W A 3-phase output W for spindle 15 42 RSP2 A Spindle current sensing 2 16 41 SL1+ A Sled channel 1 drive output + 17 40 SL1- A Sled channel 1 drive output - 18 39 SL2+ A Sled channel 2 drive output + 19 38 SL2- A Sled channel 2 drive output - 20 37 PGND3 P Power ground for sled channels 21 36 REF A Reference voltage input 22 35 MUTE1 A Mute input 1 23 34 MUTE2 A Mute input 2 24 33 RSL1 A Sled current sensing 1 25 32 RSL2 A Sled current sensing 2 26 31 VM2 P Power supply for sled 27 30 SVCC2 P Power supply for BTL Pre driver 28 29 SGND P Signal ground for BTL signal block 29 28 SLIN2 A Sled channel 2 input 30 27 SLIN1 A Sled channel 1 input 31 26 PVCC2 P Power supply for BTL CH3 32 25 PVCC1 P Power supply for BTL CH1/2 33 24 IN2 A Channel 2 input 34 23 IN1 A Channel 1 input 35 22 PGND4 P Power ground for BTL CH1/2 36 21 DO1 + A Channel 1 drive output + 37 20 DO1 - A Channel 1 drive output - 38 19 DO2 + A Channel 2 drive output + 39 18 DO2 - A Channel 2 drive output - 40 17 DO3 + A Channel 3 drive output + 41 16 DO3 - A Channel 3 drive output - 42 15 PVCC3 P Power supply for BTL CH4 5 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver Pin Definitions Pin Number Pin Number (exposed to bottom) (exposed to top) 43 14 Pin Name I/O Pin Function Description DO4 + A Channel 4 drive output + 44 13 DO4 - A Channel 4 drive output - 45 12 PGND5 P Power ground for BTL CH3/4 46 11 IN4 A Channel 4 input 47 10 IN3 A Channel 3 input 48 9 VDD P Power supply for digital block 49 8 SPIN A Spindle channel input 50 7 DIR O Spindle rotational direction output 51 6 FG O Spindle frequency generator FAN8741MTF=3X, FAN8742MTF=1X 52 5 SVCC1 P Power supply for signal block 53 4 CP1 A Charge pump capacitor1 54 3 CP2 A Charge pump capacitor2 55 2 VCP A Charge pumped voltage 56 1 DGND P Ground for digital block 6 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver Pin Definitions(continued) Parameter Value Unit Supply Voltage (Signal block) 7 V Supply Voltage (Digital block) 7 V Supply Voltage (Spindle/Sled/BTL/BTL pre driver) 15 V Power Dissipation (56-TSSOP-EP) 1.6 / 3.2 / 4.1 W Power Dissipation (56-SSOP-HS) 3.1 / 4.7 W Operating Temperature Range -20 to +75 °C Storage Temperature Range -40 to +150 °C Maximum Output Current (Spindle) 2.0 A Maximum Output Current (CH1/2/3/4, Sled) 1.0 A NOTE: 56-TSSOP-EP, Case 1 56-TSSOP-EP, Case 2 Remark Pd is measured base on the JEDEC/ STD(JESD 51-2) Power plane(Cu) PCB(glass-epoxy) soldering GND plane(Cu) Pd=1.6 W Pd=3.2 W 56-TSSOP-EP, Case 3 soldering GND plane(Cu) VIA hole Power plane(Cu) Pd=4.1 W 56-SSOP-HS, Case 1 56-SSOP-HS, Case 2 Power plane(Cu) PCB(glass-epoxy) GND plane(Cu) Pd=3.1W Pd=4.7W 7 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver Absolute Maximum Ratings (Ta = 25°C) 2. 56-TSSOP-EP, Case 2: Multi layer PCB with 1 signal, 1 power and 1 ground planes, PCB size is 76mm × 114mm × 1.6mm, Cu plane sizes for power and ground is 74mm × 62mm × 0.035mm. Down pad of IC is soldered on the PCB. 3. 56-TSSOP-EP, Case 3: PCB condition is same to case 2 except via holes, which penetrate PCB all layers. Down pad of IC is soldered on the PCB. 4. 56-SSOP-HS, Case 1: Single layer PCB with 1 signal plane only, PCB size is 76mm × 114mm × 1.6mm. 5. 56-SSOP-HS, Case 2: Multi layer PCB with 1 signal, 1 power and 1 ground planes, PCB size is 76mm × 114mm × 1.6mm, Cu plane sizes for power and ground is 74mm × 62mm × 0.035mm. 6. Power dissipation is reduced by -12.8mW/°C for using above Ta=25°C in 56-TSSOP-EP, case 1. 7. Power dissipation is reduced by -25.6mW/°C for using above Ta=25°C in 56-TSSOP-EP, case 2. 8. Power dissipation is reduced by -32.8mW/°C for using above Ta=25°C in 56-TSSOP-EP, case 3. 9. Power dissipation is reduced by -24.8mW/°C for using above Ta=25°C in 56-SSOP-HS, case 1. 10. Power dissipation is reduced by -37.6mW/°C for using above Ta=25°C in 56-SSOP-HS, case 2. 11. Do not exceed PD and SOA (Safe Operating Area). Power Dissipation Curve Power dissipation, [W] 5 56-SSOP-HS,case2 56-TSSOP-EP,case3 4 56-TSSOP-EP,case2 3 56-SSOP-HS,case1 56-TSSOP-EP,case1 2 1 SOA 25 50 75 100 125 150 175 Ambient temperature, [oC] Recommended Operating Conditions (Ta = 25°C) Parameter Min. Typ. Max. Unit Supply Voltage (Spindle Signal block) 4.5 5 5.5 V Supply Voltage (Digital block) 4.5 5 5.5 V Supply Voltage (Spindle driver) 4.5 12 13.2 V Supply Voltage (Sled driver) 4.5 12 13.2 V Supply Voltage (BTL driver) 4.5 12 SVCC2 V Supply Voltage (BTL signal block) 4.5 12 13.2 V Output current(Spindle) - 1.0 1.5 A Output current(Focus, Tracking, Loading) - 0.5 0.8 A Output current(Sled) - 0.5 0.8 A 8 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver 1. 56-TSSOP-EP, Case 1: Single layer PCB with 1 signal plane only, PCB size is 76mm × 114mm × 1.6mm. (Ta=25°C, SVCC1=VDD=PVCC1=VM2=5V,VM1=SVCC2=PVCC2=PVCC3=12V unless otherwise noted) Parameter Condition Min. Typ. Max. Units COMMON PART Quiescent Circuit Current 1 Mute1=L, Mute2=L Quiescent Circuit Current 2 Mute1=L, Mute2=H Quiescent Circuit Current 3 Mute1=H, Mute2=H Mute Low Voltage MUTE=variation Mute High Voltage MUTE=variation - 1 - - 1 - - 1.5 - - 9.5 - - 4 - - 13 - - - 0.8 V 3.0 - - V µA mA mA mA Mute Input Current MUTE=5V - 130 - Charge Pump Voltage 1 IPUMP=0mA - 19 - V Charge Pump Voltage 2 IPUMP=-1mA - 18 - V THERMAL SHUTDOWN Operating Temperature* - - 150 - oC Hysteresis Temperature* - - 25 - oC SPINDLE DRIVE PART Control Input Deadzone11 SPIN>VREF 20 50 100 mV Control Input Deadzone12 SPIN<VREF -100 -50 -20 mV 0 - 5 V 2.55 3.0 3.45 A/V Control Voltage Input Range Output Gain GMSP=GVO/RCSSP, RCSSP=0.33Ω, GVO=1[V/V] Output On Resistance(upper) Io=500mA - 0.4 - Ω Output On Resistance(lower) Io=500mA - 0.4 - Ω Output Limit Current RCSSP=0.33Ω - 1.5 - A 1 - 4 V mV Hall Amp Common Mode Input Range Minimum Hall Input Level* - 50 - - Hall Bias Output Voltage IHB=10mA 0.5 1.0 1.5 V - 1 5 µA Hall Bias Input Current FG Low Voltage IFG=3mA - - 0.5 V DIR Low Voltage IDIR=3mA - - 0.5 V SLIN1/SLIN2 > VREF 0 15 30 mV Control Input Deadzone22 SLIN1/SLIN2 < VREF -30 -15 0 mV Output Gain GMSL=GVO/RCSSL, RCSSL=1Ω, GVO=1[V/V] 0.85 1.0 1.15 A/V SLED DRIVE PART Control Input Deadzone21 Output On Resistance(upper) Io=250mA - 1.0 - Ω Output On Resistance(lower) Io=250mA - 1.0 - Ω Output Limit Current RCSSL=1Ω - 0.5 - A * : Design guarantee specification 9 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver ELECTRICAL CHARACTERISTICS (Ta = 25°c) (Ta=25°C, SVCC1=VDD=PVCC1=VM2=5V,VM1=SVCC2=PVCC2=PVCC3=12V unless otherwise noted) Parameter Condition Min. Typ. Max. Units CH1,CH2 DRIVE PART (TYPICALLY ACTUATOR DRIVER) Output Saturation Voltage H IO=500mA 0.5 V Output Saturation Voltage L IO=500mA 0.5 V Closed Loop Voltage Gain Output Offset Voltage VREF=IN1=IN2=1.65V 16.5 18 19.5 dB -50 - 50 mV CH3,CH4 DRIVE PART (TYPICALLY TILT,LOADING DRIVER) Output Saturation Voltage H IO=500mA 1.0 V Output Saturation Voltage L IO=500mA 0.5 V Closed Loop Voltage Gain Output Offset Voltage VREF=IN3=IN4=1.65V 16.5 18 19.5 dB -50 - 50 mV 0 0.5 dB CH1,CH3 GAIN DIFFERENCE SPEC (TYPICALLY FOCUS,TILT DRIVER) CH1-CH3 Gain Difference GVFT12 - GVFT34 10 FAN8741/FAN8742 Rev. 1.0.1 -0.5 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver ELECTRICAL CHARACTERISTICS (Ta = 25°C, continued) Charge Pump Outputs SVCC2 SVCC2 53 FG/DIR Outputs SVCC2 SVCC1 50 55 54 51 Spin Input Hall Inputs SVCC1 SVCC1 2 SVCC1 1K 4 1K 1K 49 SVCC1 3 1K 5 6 7 3K Ref 3K 10K Hall Bias Input Mute1 & 2 Inputs SVCC1 SVCC2 22 8 40K 23 40K 60K Spindle Drive Outputs 11 Spindle Current Sensing Input VM1 15 15 10 9 12 14 13 11 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver Equivalent Circuits(Pins numbered according to FAN8741MTF) Sled 1 & 2 Inputs Sled Drive Outputs SVCC2 24 25 SVCC2 30 1K 1K 29 17 19 16 18 Ref 10K 20 CH1/2/3/4 (BTL Channels) Inputs Sled 1 & 2 Current Sensing Inputs SVCC2 VM2 SVCC2 46 47 1K 1K 33 34 24 Ref 25 10K Reference Input CH4 Outputs SVCC2 PVCC3 SVCC2 21 43 1K 44 CH3 Outputs CH1 & 2 Outputs SVCC2 PVCC2 SVCC2 PVCC1 40 36 37 41 38 39 12 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver Equivalent Circuits(continued)(Pins numbered according to FAN8741MTF) 1. Torque Control & Output Current Control of 3-phase Bldc Motor VM1 Inside IC + Vcs Rcs - 10K Torque AMP REXT1 10K LPF + VAMP - Io SPIN R Q Commutator 6 Driver M S IOMAX Clock Generator VREF Hall sensor 1) By amplifying the voltage difference between VREF and SPIN from Servo IC(or DSP), the Torque AMP produces the input voltage(VAMP) which means input current command. 2) The output current (IO) is converted into the voltage (VCS) through the sense resistor (RCS ) and compared with the VAMP. 3) The clock generator always make the RS latch become set periodically, this enables the output driver’s on state, when the VCS and the VAMP are equal the state becomes off. 4) By the negative feedback loop, the sensed output voltage VCS equals to the VAMP. 5) Commuting sequence is selected by hall sensor input, and the minimum hall input is 50mV. 6) The gain and limit currents are calculated as shown in the table below.(Gvo=VAMP /(SPIN-VREF)=1[V/V]). Limit current Input/Output gain[A/V] Remark G 10K VO------------------------------------------- • ------------R + 10K R CS EXT1 0.5---------Rcs 10K ------------------------------------------R + 10K EXT1 is gain scaler 7) Spindle block adopts 180o commutation methodology which is fully compatible with a conventional BLDC spindle motor. Users don’t need to change or modify their spindle motor. 8) The range of the input voltage is as shown below when Rcs=0.33Ω, REXT1=0. Current [A] Forward Reverse Rotation 1.5 MUTE2 =H Dead Dead zone- zone+ GMSP=GVO / RCS MUTE2 =L,open SPIN > VREF Forward rotation SPIN < VREF Reverse brake - Short brake Short brake -50mV 0 50mV SPIN-VREF 13 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver Application Information VM2 Inside IC + Vcs Rcs - + VAMP - 10K Torque AMP REXT1 LPF 10K Io SLIN1 (or SLIN2) R Q Drive Logic S OMAX I 4 Driver M Clock Generator VREF 1) By amplifying the voltage difference between VREF and SLIN1(or SLIN2) from Servo IC(or DSP), the Torque AMP produces the input voltage(VAMP) which means input current command. 2) The output current (IO) is converted into the voltage (VCS) through the sense resistor (RCS ) and compared with the VAMP. 3) The clock generator always make the RS latch become set periodically, this enables the output driver’s on state, when the VCS and the VAMP are equal the state becomes off. 4) By the negative feedback loop, the sensed output voltage VCS equals to the VAMP. 5) To avoid output upper and lower transistor’s short through, a switch trick is needed. Turn on delay time is 1usec, so the phase delay time,when changing the current direction, is 1usec. 6) The gain and limit currents are calculated as shown in the table below.(Gvo=VAMP /[SLIN1(or SLIN2)-VREF]=1[V/V] Torque limit current Input/Output gain[A/V] G 10K VO------------------------------------------- • ------------R + 10K R CS EXT1 0.5 ----------Rcs Remark 10K ------------------------------------------R + 10K EXT1 is gain scaler 7) The range of the torque voltage is as shown below when Rcs=1W, REXT1=0. [A] Forward Reverse 0.5 Dead Dead zone- zone+ GMSL=GVO / RCS -15mV 0 SLIN1(or SLIN2)-VREF 15mV 14 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver 2. Torque Control & Output Current Control Of Sled Motor(2-phase Step Motor) power amp 20k Level shift 10k Command M ref • The reference voltage(ref) is given externally through pin21. • The input OP-amp output signal is amplified by (20K/10K) times and then fed to the power amplifier. The gain of power amplifier is 4 so the total max gain of channels 1 through 4 is 8. 4. Mute Inputs FAN8741 has 2 independent mute pins: Pin #22(MUTE1) and Pin #23(MUTE2). Details are shown below. MUTE1 MUTE2 H H H L L H L L SPINDLE Disable CH4(typ. loading driver) SPINDLE brake type Enable Disable Reverse brake when SPIN<VREF Enable Disable Short brake SPIN ≠ VREF(note) Enable - SLED Enable CH1/2/3 Disable Disable - Note: To make the spindle short brake, MUTE2 goes low and the spindle command must not be in deadzone(±50mV). When the spindle command is within the deadzone, the spindle block enters disable mode even though MUTE2 is low. 15 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver 3. Channel 1~4 Schematic SPIN + VREF - HV+ + HV- - HW+ + HW- - Current Sense Amp Low Active A D Q CK Gain Controller D-F/F Driver M 1) As in the state of the forward rotation, the D-F/F output, Q is HIGH and the motor rotates normally. At this state, if the control input is changed such that VREF>SPIN, then the motor rotates slowly by the reverse commutation in the driver. When the motor begins to rotate in the reverse direction, the D-F/F output becomes Low and the OR Gate output becomes Low. This prevents the motor from continuing to rotate in the reverse direction. This operation principle is shown in the following table and flow chart. Rotation HV Forward H Reverse L D-F/F HW Reverse Rotation Preventer (Q) VREF<SPIN VREF>SPIN H→L H Forward - H→L L - Brake and Stop Forward rotation at VREF< SPIN Rotating speed is decreased due to reverse torque at VREF>SPIN and appropriate mute combination. (Motor still rotates forward) At the moment that the motor rotates in reverse, the reverse rotation preventer makes the output power stage equal to the short brake which is lower ,and three power transistors are fully turned on. Motor rotates in reverse for short time due to motor inertia Power stage remains in short brake scheme until forward rotation command is received. 16 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver 5. Reverse Rotation Prevention(Spindle) SVcc1 SVcc1 HALL 1 HALL 1 HALL 2 HALL 3 HALL 2 HALL 3 VH VH 7. PWM frequency The PWM operation of the spindle and sled channels are controlled by an internal clock generator with a typical frequency of 100KHz. 8. ETC 1) FG and DIR output s are open-collector types. 2) By-pass capacitors are recommended at hall sensor and power supply inputs. 17 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver 6. Hall Sensor Connection FAN8741/FAN8742 Spindle motor and 6-CH actuator driver 9. Spindle Part Input-output Timing Chart 30o HU+ HU HUHV+ HV HVHW+ HW HW- U current (HU-)+(HV+) 0[A] U voltage 0[V] V current (HV-)+(HW+) 0[A] V voltage 0[V] W current (HW-)+(HU+) 0[A] W voltage 0[V] 18 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver Typical Application Circuits(FAN8741MTF example) VM1 (for spindle,12V) R_hall1 1 VM1 DGND 56 2 HU+ VCP 55 3 HU− CP2 54 4 HV+ CP1 53 5 HV− SVCC1 52 6 HW+ FG 51 7 HW− DIR 50 HALL-U 0.1µF 0.1µF 5V HALL-V SVCC1(5V) 8 VH SPIN 49 9 PGND1 VDD 48 10kΩ(full up R) R_hall2 10kΩ(full up R) HALL-W R1 VDD (5V) 10 U IN3 47 11 RSP1 IN4 46 RSP 15 RSP2 3-Phase BLDC Motor 16 SL1+ 17 SL1− M PGND5 45 DO4− 44 M 14 W (pad down) 13 PGND2 FAN8741MTF/ FAN8742MTF R3 12 V Sled(stepping) Motor R2 DO4+ 43 Loading motor PVCC3 42 PVCC3(5~12V) DO3− 41 Tilt actuator DO3+ 40 18 SL2+ DO2− 39 19 SL2− DO2+ 38 20 PGND3 DO1− 37 21 REF DO1+ 36 Tracking actuator Focus actuator 0.1µF 22 MUTE1 PGND4 35 23 MUTE2 IN1 34 24 RSL1 IN2 33 25 RSL2 PVCC1 32 26 VM2 PVCC2 31 R4 RSL2 RSL1 VM2 (for sled, 5~12V) PVCC1(5~12V) PVCC2(5~12V) SVCC2(5~12V) (SVCC2! !PVCC1,2,3) 27 SVCC2 SLIN1 30 28 SGND SLIN2 29 R6 R7 DSP or controller R5 Component Reference value Remark R1~R7 10kΩ Gain scaling resistors. Please refer to pages 12,13, and 14. R_hall1,R_hall2 100Ω Hall bias resistors RSL1,RSL2 1Ω Rcs at sled driver. (I_limit=0.5A,Gain=0.5A/V@R6,R7 are 10kΩ) 0.33Ω Rcs at spindle driver. (I_limit=1.5A,Gain=1.5A/V@R1 is 10kΩ) RSP Bypass electrolytic capacitors(47~100µF) are recommended at power supply inputs. 19 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver Typical Application Circuits(FAN8741G example) 1 DGND VM1 56 2 VCP HU+ 55 3 CP2 HU− 54 4 CP1 HV+ 53 5 SVCC1 HV− 52 VM1 (for spindle,12V) 0.1µF 0.1µF HALL-U R_hall1 5V HALL-V R1 6 FG HW+ 51 7 DIR HW− 50 HALL-W 10kΩ(full up R) 10kΩ(full up R) SVCC1(5V) R_hall2 8 SPIN VH 49 9 VDD PGND1 48 VDD (5V) R2 10 IN3 U 47 11 IN4 RSP1 46 RSP R3 13 DO4− M Loading motor 14 DO4+ 15 PVCC3 PVCC3(5~12V) 16 DO3− Tilt actuator 17 DO3+ Tracking actuator Focus actuator FAN8741G/ FAN8742G 12 PGND5 V 45 PGND2 44 W 43 RSP2 42 3-Phase BLDC Motor SL1+ 41 SL1− 40 DSP or controller 18 DO2− SL2+ 39 19 DO2+ SL2− 38 20 DO1− PGND3 37 21 DO1+ REF 36 M Sled(stepping) Motor 0.1µF 22 PGND4 MUTE1 35 23 IN1 MUTE2 34 24 IN2 RSL1 33 25 PVCC1 RSL2 32 26 PVCC2 VM2 31 R4 R5 RSL1 PVCC1(5~12V) RSL2 VM2 (for sled, 5~12V) PVCC2(5~12V) 27 SLIN1 SVCC2 30 28 SLIN2 SGND 29 R6 SVCC2(5~12V) (SVCC2! !PVCC1,2,3) R7 Component Reference value Remark R1~R7 10kΩ Gain scaling resistors. Please refer to 12,13,14 pages. R_hall1,R_hall2 100Ω Hall bias resistors RSL1,RSL2 1Ω Rcs at sled driver. (I_limit=0.5A,Gain=0.5A/V@R6,R7 are 10kΩ) 0.33Ω Rcs at spindle driver. (I_limit=1.5A,Gain=1.5A/V@R1 is 10kΩ) RSP Bypass electrolytic capacitors(47~100µF) are recommended at power supply inputs. 20 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com 56-TSSOP-EP unit=mm 21 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver Package Dimensions of 56-TSSOP-EP(lead frame is exposed to the bottom) 56-SSOP-HS unit=mm 22 FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com FAN8741/FAN8742 Spindle motor and 6-CH actuator driver Package Dimensions of 56-SSOP-HS(lead frame is exposed to the top) FAN8741/FAN8742 Spindle motor and 6-CH actuator driver FAN8741/FAN8742 Rev. 1.0.1 www.fairchildsemi.com 23