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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
April 2005
FAN8741/FAN8742 Spindle Motor and 6-CH Driver [Spindle(PWM), Sled 2-CH(PWM) 4-CH(Linear)]
Features
Common
* Built-in thermal shutdown circuit (TSD) * 8 Independent voltage sources * Corresponds to 3.3V or 5V DSP * 4 selectable mute inputs
Description
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.
Spindle
* Output PWM mode control * FG output: open collector type * Selectable brake(short & reverse brake) * Built-in hall bias * 180o commutation(compatible with conventional BLDC spindle motor) * Built in short-through protection function
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. The FAN8741MTF/FAN8742MTF is available in a 56-TSSOP-EP package, which is very thin and the leadframe is exposed to the bottom side.
BTL(Sled 2-channels)
* Output PWM mode control * Built in short-through protection function
BTL(Other 4-channels)
* Output linear mode control
Ordering Information
Device Package 56-SSOP-HS 56-SSOP-HS 56-SSOP-HS 56-SSOP-HS 56-TSSOP-EP 56-TSSOP-EP Operating Temp. -25C to +75C -25C to +75C -25C to +75C -25C to +75C -25C to +75C -25C to +75C -25C to +75C -25C to +75C
FAN8741G FAN8741GX FAN8742G FAN8742GX FAN8741MTF
Typical Applications
* CD-ROM * CD-RW * DVD-ROM * DVD-RAM * DVD Player (DVDP) * Other compact disk media * Game consoles
FAN8741MTFX 56-TSSOP-EP FAN8742MTF
FAN8742MTFX 56-TSSOP-EP
HS=HeatSlug, EP=ExposedPad
X:Tape & Reel type FAN8741:FG3X FAN8742:FG1X
(c)2005 Fairchild Semiconductor Corporation
1
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FAN8741/FAN8742 Rev. 1.0.1
FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
Internal Block Diagram(Pins numbered according to the FAN8741MTF--Leadframe exposed to the bottom)
MUTE1 22 MUTE2 23 SVCC1 52 DGND 56
Mute Selection &Spindle brake sel.
Reverse Detect
50 DIR 51 FG 2 HU+
Hall Amp
Freguency Generator
VDD 48
3 HU- 4 HV+ 5 HV- 6 HW+ 7 HW- Hall bias 8 VH 1 VM1
VCP 55 CP2 54 CP1 53 IN3 47 IN4 46 PVCC3 42
Charge pump & Oscillator
VCP OSC
TSD
Level shift
Spindle Direction
LPF
15 RSP2
VCP
Commutator & Power drive
11 RSP1 10 U 12 V 14 W 13 PGND2 9 PGND1 49 SPIN 21 REF
DO4- 44 DO4+ 43
10k 20k
PWM Control
OSC
PGND5 45 PVCC2 31
BTL driver
REF
DO3- 41 DO3+ 40
BTL driver
LPF
VCP
26 VM2 24 RSL1
PWM Control
PVCC1 32
OSC
4
H bridge
16 SL1+ 17 SL1- 20 PGND3
DO2- 39 DO2+ 38
BTL driver
LPF
VCP
25 RSL2
DO1- 37 DO1+ 36 PGND4 35 IN1 34 IN2 33
BTL driver
10k 10k
Flip Flop IOMAX
OSC
Drive Logic
18 SL2+ 19 SL2-
PWM Control
H-bridge
29 SLIN2 30 SLIN1 27 SVCC2 28 SGND
2 FAN8741/FAN8742 Rev. 1.0.1
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
Pin Assignments(Leadframe exposed to the bottom side)
VM1 HU+ HUHV+ HVHW+ HWVH PGND1 U RSP1 V PGND2 W RSP2 SL1+ SL1SL2+ SL2PGND3 REF MUTE1 MUTE2 RSL1 RSL2 VM2 SVCC2 SGND
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
56 55 54 53 52 51 50 49 48 47 46 45
DGND VCP CP2 CP1 SVCC1 FG DIR SPIN VDD IN3 IN4 PGND5 DO4DO4+ PVCC3 DO3DO3+ DO2DO2+ DO1DO1+ PGND4 IN1 IN2 PVCC1 PVCC2 SLIN1 SLIN2
FAN8741MTF/ FAN8742MTF
(PAD DOWN)
44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29
3 FAN8741/FAN8742 Rev. 1.0.1
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
Pin Assignments(Leadframe exposed to the top side)
DGND VCP CP2 CP1 SVCC1 FG DIR SPIN VDD IN3 IN4 PGND5 DO4DO4+ PVCC3 DO3DO3+ DO2DO2+ DO1DO1+ PGND4 IN1 IN2 PVCC1 PVCC2 SLIN1 SLIN2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
56 55 54 53 52 51 50 49 48 47 46 45 44
VM1 HU+ HUHV+ HVHW+ HWVH PGND1 U RSP1 V PGND2 W RSP2 SL1+ SL1SL2+ SL2PGND3 REF MUTE1 MUTE2 RSL1 RSL2 VM2 SVCC2 SGND
FAN8741G/ FAN8742G
(SHOULD THIS SAY "PAD UP" TO MATCH THE PREVIOUS PAGE?)
43 42 41 40 39 38 37 36 35 34 33 32 31 30 29
4 FAN8741/FAN8742 Rev. 1.0.1
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
Pin Definitions
Pin Number
(exposed to bottom)
Pin Number
(exposed to top)
Pin Name
VM1 HU+ HUHV+ HVHW+ HWVH PGND1 U RSP1 V PGND2 W RSP2 SL1+ SL1SL2+ SL2PGND3 REF MUTE1 MUTE2 RSL1 RSL2 VM2 SVCC2 SGND SLIN2 SLIN1 PVCC2 PVCC1 IN2 IN1 PGND4 DO1 + DO1 DO2 + DO2 DO3 + DO3 PVCC3
I/O
P A A A A A A A P A A A P A A A A A A P A A A A A P P P A A P P A A P A A A A A A P
Pin Function Description
Power supply for spindle Hall signal input(Hu+) Hall signal input(Hu-) Hall signal input(Hv+) Hall signal input(Hv-) Hall signal input(Hw+) Hall signal input(Hw-) Hall bias Power ground 1 for spindle channel 3-phase output U for spindle Spindle current sensing 1 3-phase output V for spindle Power ground 2 for spindle channel 3-phase output W for spindle Spindle current sensing 2 Sled channel 1 drive output + Sled channel 1 drive output Sled channel 2 drive output + Sled channel 2 drive output Power ground for sled channels Reference voltage input Mute input 1 Mute input 2 Sled current sensing 1 Sled current sensing 2 Power supply for sled Power supply for BTL Pre driver Signal ground for BTL signal block Sled channel 2 input Sled channel 1 input Power supply for BTL CH3 Power supply for BTL CH1/2 Channel 2 input Channel 1 input Power ground for BTL CH1/2 Channel 1 drive output + Channel 1 drive output Channel 2 drive output + Channel 2 drive output Channel 3 drive output + Channel 3 drive output Power supply for BTL CH4
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42
56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15
5 FAN8741/FAN8742 Rev. 1.0.1
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
Pin Definitions(continued)
Pin Number
(exposed to bottom)
Pin Number
(exposed to top)
Pin Name
DO4 + DO4 PGND5 IN4 IN3 VDD SPIN DIR FG SVCC1 CP1 CP2 VCP DGND
I/O
A A P A A P A O O P A A A P
Pin Function Description
Channel 4 drive output + Channel 4 drive output Power ground for BTL CH3/4 Channel 4 input Channel 3 input Power supply for digital block Spindle channel input Spindle rotational direction output Spindle frequency generator FAN8741MTF=3X, FAN8742MTF=1X Power supply for signal block Charge pump capacitor1 Charge pump capacitor2 Charge pumped voltage Ground for digital block
43 44 45 46 47 48 49 50 51 52 53 54 55 56
14 13 12 11 10 9 8 7 6 5 4 3 2 1
6 FAN8741/FAN8742 Rev. 1.0.1
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
Absolute Maximum Ratings (Ta = 25C)
Parameter
Supply Voltage (Signal block) Supply Voltage (Digital block) Supply Voltage (Spindle/Sled/BTL/BTL pre driver) Power Dissipation (56-TSSOP-EP) Power Dissipation (56-SSOP-HS) Operating Temperature Range Storage Temperature Range Maximum Output Current (Spindle) Maximum Output Current (CH1/2/3/4, Sled) NOTE:
Value
7 7 15 1.6 / 3.2 / 4.1 3.1 / 4.7 -20 to +75 -40 to +150 2.0 1.0
Unit
V V V W W C C A A
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) GND plane(Cu) soldering
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
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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 x 114mm x 1.6mm. 2. 56-TSSOP-EP, Case 2: Multi layer PCB with 1 signal, 1 power and 1 ground planes, PCB size is 76mm x 114mm x 1.6mm, Cu plane sizes for power and ground is 74mm x 62mm x 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 x 114mm x 1.6mm. 5. 56-SSOP-HS, Case 2: Multi layer PCB with 1 signal, 1 power and 1 ground planes, PCB size is 76mm x 114mm x 1.6mm, Cu plane sizes for power and ground is 74mm x 62mm x 0.035mm. 6. Power dissipation is reduced by -12.8mW/C for using above Ta=25C in 56-TSSOP-EP, case 1. 7. Power dissipation is reduced by -25.6mW/C for using above Ta=25C in 56-TSSOP-EP, case 2. 8. Power dissipation is reduced by -32.8mW/C for using above Ta=25C in 56-TSSOP-EP, case 3. 9. Power dissipation is reduced by -24.8mW/C for using above Ta=25C in 56-SSOP-HS, case 1. 10. Power dissipation is reduced by -37.6mW/C for using above Ta=25C 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 4 56-TSSOP-EP,case3
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 = 25C)
Parameter
Supply Voltage (Spindle Signal block) Supply Voltage (Digital block) Supply Voltage (Spindle driver) Supply Voltage (Sled driver) Supply Voltage (BTL driver) Supply Voltage (BTL signal block) Output current(Spindle) Output current(Focus, Tracking, Loading) Output current(Sled)
Min.
4.5 4.5 4.5 4.5 4.5 4.5 -
Typ.
5 5 12 12 12 12 1.0 0.5 0.5
Max.
5.5 5.5 13.2 13.2 SVCC2 13.2 1.5 0.8 0.8
Unit
V V V V V V A A A
8 FAN8741/FAN8742 Rev. 1.0.1
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
ELECTRICAL CHARACTERISTICS (Ta = 25c)
(Ta=25C, SVCC1=VDD=PVCC1=VM2=5V,VM1=SVCC2=PVCC2=PVCC3=12V unless otherwise noted) Parameter COMMON PART
Quiescent Circuit Current 1 Mute1=L, Mute2=L 3.0 1 1 1.5 9.5 4 13 130 19 18 0.8 mA
Condition
Min. Typ. Max. Units
Quiescent Circuit Current 2
Mute1=L, Mute2=H
mA
Quiescent Circuit Current 3 Mute Low Voltage Mute High Voltage Mute Input Current Charge Pump Voltage 1 Charge Pump Voltage 2
Mute1=H, Mute2=H MUTE=variation MUTE=variation MUTE=5V IPUMP=0mA IPUMP=-1mA
mA V V A V V
THERMAL SHUTDOWN
Operating Temperature* Hysteresis Temperature* 150 25 oC oC
SPINDLE DRIVE PART
Control Input Deadzone11 Control Input Deadzone12 Control Voltage Input Range Output Gain Output On Resistance(upper) Output On Resistance(lower) Output Limit Current GMSP=GVO/RCSSP, RCSSP=0.33, GVO=1[V/V] Io=500mA Io=500mA RCSSP=0.33 IHB=10mA IFG=3mA IDIR=3mA SPIN>VREF SPINHall Amp Common Mode Input Range Minimum Hall Input Level* Hall Bias Output Voltage Hall Bias Input Current FG Low Voltage DIR Low Voltage
SLED DRIVE PART
Control Input Deadzone21 Control Input Deadzone22 Output Gain Output On Resistance(upper) Output On Resistance(lower) Output Limit Current * : Design guarantee specification SLIN1/SLIN2 > VREF SLIN1/SLIN2 < VREF GMSL=GVO/RCSSL, RCSSL=1, GVO=1[V/V] Io=250mA Io=250mA RCSSL=1 0 -30 0.85 15 -15 1.0 1.0 1.0 0.5 30 0 1.15 mV mV A/V A
9 FAN8741/FAN8742 Rev. 1.0.1
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
ELECTRICAL CHARACTERISTICS (Ta = 25C, continued)
(Ta=25C, SVCC1=VDD=PVCC1=VM2=5V,VM1=SVCC2=PVCC2=PVCC3=12V unless otherwise noted) Parameter
Output Saturation Voltage H Output Saturation Voltage L Closed Loop Voltage Gain Output Offset Voltage IO=500mA IO=500mA VREF=IN1=IN2=1.65V 16.5 -50
Condition
Min.
Typ.
0.5 0.5 18 -
Max.
Units
V V
CH1,CH2 DRIVE PART (TYPICALLY ACTUATOR DRIVER)
19.5 50
dB mV
CH3,CH4 DRIVE PART (TYPICALLY TILT,LOADING DRIVER)
Output Saturation Voltage H Output Saturation Voltage L Closed Loop Voltage Gain Output Offset Voltage IO=500mA IO=500mA VREF=IN3=IN4=1.65V 16.5 -50 1.0 0.5 18 19.5 50 V V dB mV
CH1,CH3 GAIN DIFFERENCE SPEC (TYPICALLY FOCUS,TILT DRIVER)
CH1-CH3 Gain Difference GVFT12 - GVFT34 -0.5 0 0.5 dB
10 FAN8741/FAN8742 Rev. 1.0.1
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
Equivalent Circuits(Pins numbered according to FAN8741MTF)
Charge Pump Outputs
SVCC2 SVCC2 SVCC2
FG/DIR Outputs
SVCC1
53
54
55
50 51
Spin Input
SVCC1
Hall Inputs
SVCC1 2 SVCC1 3 5 7 3K 3K
SVCC1 1K 49 10K 1K
4 6
Ref
1K
1K
Hall Bias Input
Mute1 & 2 Inputs
SVCC2 40K 40K
SVCC1
8
22 23
60K
Spindle Drive Outputs
Spindle Current Sensing Input
11
15
VM1
15
10 12 14
9
13
11 FAN8741/FAN8742 Rev. 1.0.1
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
Equivalent Circuits(continued)(Pins numbered according to FAN8741MTF)
Sled 1 & 2 Inputs
SVCC2
Sled Drive Outputs
24 25
SVCC2 1K 10K 1K
29 30
Ref
16 18
17 19
20
CH1/2/3/4 (BTL Channels) Inputs
SVCC2
Sled 1 & 2 Current Sensing Inputs
VM2
SVCC2 1K 10K 1K
24
Ref
33 34 46 47
25
Reference Input
CH4 Outputs
SVCC2 PVCC3
SVCC2
21 1K
43 44
CH3 Outputs
SVCC2 PVCC2
CH1 & 2 Outputs
SVCC2 PVCC1
40 41
36 37 38 39
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FAN8741/FAN8742 Rev. 1.0.1
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
Application Information
1. Torque Control & Output Current Control of 3-phase Bldc Motor
VM1
Inside IC
+ Vcs + VAMP R IOMAX Clock Generator Hall sensor S Q LPF Io Commutator Driver Rcs
10K Torque AMP
REXT1 SPIN
10K
6
M
VREF
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
0.5---------Rcs
Input/Output gain[A/V]
G 10K VO ------------------------------------------ * ------------R + 10K R CS EXT1
Remark
-----------------------------------------R + 10K EXT1
10K
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=0.33, REXT1=0.
Current [A] 1.5
Dead Dead zone- zone+ GMSP=GVO / RCS
Reverse
Forward
Rotation
MUTE2 =H MUTE2 =L,open SPIN > VREF SPIN < VREF Forward rotation Reverse brake Short brake Short brake
-50mV 0 50mV
SPIN-VREF
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
2. Torque Control & Output Current Control Of Sled Motor(2-phase Step Motor)
VM2
Inside IC
+ Vcs + VAMP R I
OMAX
Rcs
LPF Io Q Drive Logic Driver
10K Torque AMP
REXT1 SLIN1 (or SLIN2)
10K
S Clock Generator
4
M
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
0.5 ---------Rcs
Input/Output gain[A/V]
G 10K VO ------------------------------------------ * ------------R + 10K R CS EXT1 -----------------------------------------R + 10K EXT1
Remark
10K
is gain scaler
7) The range of the torque voltage is as shown below when Rcs=1W, REXT1=0.
[A] 0.5
Reverse
Forward
Dead Dead zone- zone+ GMSL=GVO / RCS
-15mV 0
15mV
SLIN1(or SLIN2)-VREF
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FAN8741/FAN8742 Rev. 1.0.1
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
3. Channel 1~4 Schematic
power amp 20k 10k Command
Level shift
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
H
MUTE2
H
SPINDLE
SLED
Enable
CH1/2/3
CH4(typ. loading driver)
Disable
SPINDLE brake type
Reverse brake when SPINH L L Note:
L H L Disable
Enable Enable Disable Disable
Disable Enable
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.
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FAN8741/FAN8742 Rev. 1.0.1
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
5. Reverse Rotation Prevention(Spindle)
SPIN VREF
+ -
Current Sense Amp
HV+ HV-
+ A D CK D-F/F Q
Low Active
HW+ HW-
+ -
Gain Controller
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
Forward Reverse
HV
H L
HW
HL HL
D-F/F (Q)
H L
Reverse Rotation Preventer VREFForward -
VREF>SPIN
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.
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FAN8741/FAN8742 Rev. 1.0.1
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
6. Hall Sensor Connection
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.
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
9. Spindle Part Input-output Timing Chart
HU+
30o
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]
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FAN8741/FAN8742 Rev. 1.0.1
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FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
Typical Application Circuits(FAN8741MTF example)
1 VM1
VM1 (for spindle,12V) R_hall1 5V
HALL-U
DGND 56 VCP 55 CP2 54 CP1 53 SVCC1 52
SVCC1(5V)
2 HU+ 3 HU- 4 HV+
0.1F
0.1F
HALL-V
5 HV- 6 HW+
HALL-W
FG 51 DIR 50 SPIN 49 VDD 48 IN3 47
10k(full up R)
10k(full up R)
7 HW-
R_hall2
R1
8 VH 9 PGND1 10 U
RSP
VDD (5V)
R2 R3
11 RSP1
IN4 46
FAN8741MTF/ FAN8742MTF
12 V 13 PGND2 14 W
PGND5 45 DO4- 44 M DO4+ 43 PVCC3 42
PVCC3(5~12V)
(pad down)
Loading motor
3-Phase BLDC Motor Sled(stepping) Motor
15 RSP2 16 SL1+ 17 SL1-
DO3- 41
Tilt actuator
DO3+ 40 DO2- 39 DO2+ 38 DO1- 37 DO1+ 36 PGND4 35
R4
M
18 SL2+ 19 SL2- 20 PGND3 21 REF
Tracking actuator Focus actuator
0.1F
22 MUTE1 23 MUTE2 24 RSL1
RSL2 VM2 (for sled, 5~12V) RSL1
IN1 34
R5
25 RSL2 26 VM2 27 SVCC2
PVCC1 32
PVCC1(5~12V)
PVCC2 31
PVCC2(5~12V)
SLIN1 30
R6
SVCC2(5~12V) (SVCC2! !PVCC1,2,3)
28 SGND
SLIN2 29
R7
Component
R1~R7 R_hall1,R_hall2 RSL1,RSL2 RSP
Reference value
10k 100 1 0.33
Remark
Gain scaling resistors. Please refer to pages 12,13, and 14. Hall bias resistors Rcs at sled driver. (I_limit=0.5A,Gain=0.5A/V@R6,R7 are 10k) Rcs at spindle driver. (I_limit=1.5A,Gain=1.5A/V@R1 is 10k)
Bypass electrolytic capacitors(47~100F) are recommended at power supply inputs.
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FAN8741/FAN8742 Rev. 1.0.1
DSP or controller
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IN2 33
FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
Typical Application Circuits(FAN8741G example)
1 DGND 2 VCP
0.1F 0.1F
VM1 56 HU+ 55 HU- 54 HV+ 53
HALL-V
VM1 (for spindle,12V)
HALL-U
R_hall1 5V
3 CP2 4 CP1 5 SVCC1
HV- 52 HW+ 51
HALL-W
SVCC1(5V) 10k(full up R)
6 FG
10k(full up R)
7 DIR 8 SPIN 9 VDD 10 IN3
HW- 50
R_hall2
R1
VH 49 PGND1 48 U 47
RSP
R2 R3
VDD (5V)
11 IN4 12 PGND5 13 DO4-
M
RSP1 46 V 45 PGND2 44 W 43 RSP2 42 SL1+ 41 SL1- 40 SL2+ 39 SL2- 38 PGND3 37 REF 36
0.1F
FAN8741G/ FAN8742G
Loading motor
14 DO4+ 15 PVCC3
PVCC3(5~12V)
16 DO3-
3-Phase BLDC Motor
Tilt actuator
17 DO3+ 18 DO2- 19 DO2+ 20 DO1- 21 DO1+ 22 PGND4
R4
M Sled(stepping) Motor
Tracking actuator Focus actuator
Component
R1~R7 R_hall1,R_hall2 RSL1,RSL2 RSP
FAN8741/FAN8742 Rev. 1.0.1
DSP or controller
1
MUTE1 35 MUTE2 34 RSL1 33
RSL1
23 IN1
R5
24 IN2 25 PVCC1
PVCC1(5~12V)
RSL2 32 VM2 31 SVCC2 30 SGND 29
RSL2 VM2 (for sled, 5~12V)
26 PVCC2
PVCC2(5~12V)
27 SLIN1
R6
28 SLIN2
R7
SVCC2(5~12V) (SVCC2!PVCC1,2,3) !
Reference value
10k 100 0.33
Remark
Gain scaling resistors. Please refer to 12,13,14 pages. Hall bias resistors Rcs at sled driver. (I_limit=0.5A,Gain=0.5A/V@R6,R7 are 10k) Rcs at spindle driver. (I_limit=1.5A,Gain=1.5A/V@R1 is 10k)
Bypass electrolytic capacitors(47~100F) are recommended at power supply inputs.
20
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-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-SSOP-HS(lead frame is exposed to the top)
56-SSOP-HS
unit=mm
22
FAN8741/FAN8742 Rev. 1.0.1
www.fairchildsemi.com
FAN8741/FAN8742 Spindle motor and 6-CH actuator driver
23
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FAN8741/FAN8742 Rev. 1.0.1

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