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FAN8732G/FAN8732BG/FAN8732CG
Features
Common
* * * * Built-in thermal shutdown circuit (TSD) Built-in power save circuit 4 Independent voltage sources Corresponds to 3.3V or 5V DSP
Spindle
* Output PWM mode control
BTL(Sled 2-channels)
* Output PWM mode control
BTL(Other 3-channels)
* Output LINEAR mode control
Typical Applications
* * * * * * Compact disk ROM (CD-ROM) Compact disk RW (CD-RW) Digital video disk ROM (DVD-ROM) Digital video disk RAM (DVD-RAM) Digital video disk Player (DVDP) Other compact disk media
(c)2003 Fairchild Semiconductor Corporation
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Description
The FAN8732G/BG/CG is a monolithic IC suitable for a PWM 3-phase BLDC spindle motor driver, 2-CH PWM motor drivers for sled motor and 3-CH linear drivers which drive the focus actuator, tracking actuator and loading motor of the optical media applications.
42-SSOP-EP
Ordering Information
Device FAN8732G FAN8732GX FAN8732BG FAN8732BGX FAN8732CG FAN8732CGX Package 42-SSOP-EP 42-SSOP-EP 42-SSOP-EP 42-SSOP-EP 42-SSOP-EP 42-SSOP-EP Operating Temp. -20C ~ +75C -20C ~ +75C -20C ~ +75C -20C ~ +75C -20C ~ +75C -20C ~ +75C
X:Tape & Reel type
FAN8732G:FG1X FAN8732BG:FG3X FAN8732CG:FG3X,Pull down resistor at SB pin
Rev. 1.0.1
FAN8732G/FAN8732BG/FAN8732CG
Pin Assignments
IN4
1
42
OSC
IN5 PVCC3 CS2
2 3
41 40
MUTE IN3 PVCC1
4
39
DO5+ DO5-
5
38 37
SB DO3-
6
PGND3
7
36
DO3+ DO1DO1+
CS1 DO4+
8 9
35 34
DO4-
10 11
33
PGND1
PGND2 W
12
V U
13 14
FAN8732G/ FAN8732BG/ FAN8732CG
32
SVCC
31
DO2+ DO2-
30
29
SGND IN2 IN1
CS3 HWHW+
15
28 27
16
17
26
SPIN
HV-
18 19
25 24 23 22
VREF FG
HV+ HU-
20 21
VH PVCC2
HU+
2
FAN8732G/FAN8732BG/FAN8732CG
Pin Definitions
Pin Number 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 Pin Name IN4 IN5 PVCC3 CS2 DO5 + DO5 PGND3 CS1 DO4 + DO4 PGND2 W V U CS3 HW HW + HV HV + HU HU + PVCC2 VH FG VREF SPIN IN1 IN2 SGND DO2 DO2 + SVCC PGND1 I/O I I O O O O O O O I I I I I I I O I I I I O O Pin Function Description CH4 input (typically sled1 input) CH5 input (typically sled2 input) Power supply for CH4 and CH5 Current sense for CH5 CH5 + drive output (typically sled2 output +) CH5 - drive output (typically sled2 output -) Power ground 3 Current sense for CH4 CH4 + drive output (typically sled1 output +) CH4 - drive output (typically sled1 output -) Power ground 2 3-phase output W for spindle 3-phase output V for spindle 3-phase output U for spindle Current sense for spindle driver Hall W(-) input Hall W(+) input Hall V(-) input Hall V(+) input Hall U(-) input Hall U(+) input Power supply for spindle driver Hall bias Frequency generator (FAN8732G:FG1X, FAN8732BG:FG3X) Reference voltage input Spindle torque control Channel 1 input (typically focus input) Channel 2 input (typically tracking input) Signal ground CH2 - drive output (typically tracking output +) CH2 + drive output (typically tracking output -) Power supply for signal block and CH1, CH2 Power ground 1
3
FAN8732G/FAN8732BG/FAN8732CG
Pin Definitions (Continued)
Pin Number 34 35 36 37 38 39 40 41 42 Pin Name DO1 + DO1 DO3 + DO3 SB PVCC1 IN3 MUTE OSC I/O O O O O I I I I Pin Function Description CH1 + drive output ((typically focus output +) CH1 - drive output (typically focus output -) CH3 + drive output (typically loading output +) CH3 - drive output (typically loading output -) Short Brake mode selection Power supply for CH3 Channel 3 input (typically loading input) All channel mute PWM carrier frequency set
4
FAN8732G/FAN8732BG/FAN8732CG
Internal Block Diagram
IN4 IN5 PVCC3 CS2
1 2 3 4 OSC
Oscillator All mute
42 41 40 39
OSC MUTE IN3 PVCC1 SB DO3DO3+ DO1DO1+ PGND1 SVCC DO2+ DO2SGND IN2 IN1
LPF
IN3
Short Brake Mode
+
4 4
38 37 36
DO5+ DO5PGND3 CS1 DO4+ DO4PGND2
5 6
Drive Logic
QR S
Gm
IOMAX
7
+
H bridge
6 6
35 34 33 32
PWM Control
LPF
OSC
-
8 PVCC3 9 10
H bridge
Spindle power
PWM Control
OSC
+
TSD
6 6
31 30 29
11
-
Commutator & Power driver
OSC 28 27
W V U CS3
12 13 14
PWM Control
15
LPF
Reverse detector HWHW+ HVHV+ HUHU+
26 25
SPIN VREF FG
17 18 19 20 21
Hall Amp
16
Frequency generator
24
Focus, Tracking, Loading block Spindle power
Bootstrap Regulator
Hall bias
23 22
VH PVCC2
5
FAN8732G/FAN8732BG/FAN8732CG
Equivalent Circuits
Sled & Spindle Input Actuator & Loading Input
SVCC
SVCC
2K 1 2 26 27 28 40
2K
Hall Input
Current Sense Input
SVCC 4 16 17 18 19 20 21 2K 8 15
Hall Bias Input
SVCC
FG Output
SVCC
23
24
Vref Input
Drive Output
SVCC 2K 5 2K 25 2K 36 37 6 12 14
30 31 34 35
6
FAN8732G/FAN8732BG/FAN8732CG
Equivalent Circuits (Continued)
Mute/SB Input(FAN8732G/BG) Oscillation Input
SVCC 2K 8K 38 41 30K 12K 42 2K
2K
SB Input(FAN8732CG)
8K 38 10K
12K
30K
7
FAN8732G/FAN8732BG/FAN8732CG
Absolute Maximum Ratings (Ta = 25C)
Parameter Supply Voltage (Signal block & CH1,2) Supply Voltage (Power for CH3) Supply Voltage (Spindle driver) Supply Voltage (Power for CH4 & 5) Power dissipation Operating Temperature Range Storage temperature Range Maximum Output Current (Spindle) Maximum Output Current (Focus, Tracking, Loading) Maximum Output Current (Sled)
Note:
Symbol SVCCmax PVCC1max PVCC2max PVCC3max PD TOPR TSTG IOmax1 IOmax2 IOmax3 Case 2
Value 7 15 15 15 1.9 / 3.3
NOTE
Unit V V V V W C C A A A Remark
Pd is measured base on the JEDEC/STD(JESD 51-2)
-20 ~ +75 -40 ~ +150 1.5 1.0 0.5
Case 1
Power plane(Cu) PCB(glass-epoxy) GND plane(Cu)
Pd=1.9W
Pd=3.3W
1. Case 1: Single layer PCB with 1 signal plane only. PCB size is 76mm x 114mm x 1.6mm. 2. Case 2: Multi layer PCB with 1 signal, 1 power and 1 ground planes. PCB size is 76mm x 114mm x 1.6mm. Cu planes size for power and ground is 74mm x 62mm x 0.035mm. 3. These are experimental datum. 4. Power dissipation reduce rate of the case 1: -15.2mW/C(Ta25C) 5. Power dissipation reduce rate of the case 2: -26.4mW/C(Ta25C) 6. Should not exceed PD and SOA (Safe Operating Area)
Power Dissipation Curve
Pd [mW] 3,000 2,000 case1 1,000 case2
SOA
0 0 25 50 75 100 125 150 175 Ambient Temperature, Ta [C]
8
FAN8732G/FAN8732BG/FAN8732CG
Recommended Operating Conditions (Ta = 25C)
Parameter Operating Supply Voltage (Signal block & CH1,2) Operating Supply Voltage (Power for CH3) Operating Supply Voltage (Spindle driver) Operating Supply Voltage (Power for CH4,5) Output current(Spindle) Output current(Focus, Tracking, Loading) Output current(Sled) PWM carrier frequency Symbol SVCC PV CC1 PV CC2 PV CC3 IO1 IO2 IO3 Fosc Min. 4.5 4.5 6 4.5 30 Typ. 5 12 12 12 0.5 0.5 0.25 Max. 7 13.2 13.2 13.2 1.0 0.8 0.4 120 Unit V V V V A A A KHz
9
FAN8732G/FAN8732BG/FAN8732CG
Electrical Characteristics (Ta = 25C)
(Ta=25C, SVCC =PVCC1=5V, PV CC2=PVCC3=12V unless otherwise noted) Parameter COMMON PART Quiescent Circuit Current Mute On Current Mute On Voltage Mute Off Voltage Mute Input Current PWM Carrier Frequency REF input voltage range REF input current range SB Low Voltage SB High Voltage SB Input Current1 SB Input Current2 SPINDLE DRIVE PART Maximum Output Voltage1 Control Voltage Deadzone11 Control Voltage Deadzone12 Control Voltage Input Range1 Voltage Gain1 Control Voltage Limit 1F Control Voltage Limit 1R Hall Amp Common Mode Input Range Hall Bias Output Voltage VH pin Sink Current Maximum Output Voltage21 Maximum Output Voltage22 Control Voltage Deadzone21 Control Voltage Deadzone22 Control Voltage Input Range2 Voltage Gain2 Control Voltage Limit 2 Output Leak Current VOM1 VDEAD11 VDEAD12 VIN1 GVO1 VLIMIT1F VLIMIT1R VHCOM VVH IVH VOM21 VOM22 VDEAD21 VDEAD22 VIN2 GVO2 VLIMIT2 ILEAK IVH=10mA MUTE-5V IO=0.5A, PVCC3=5V IO=0.5A, PVCC3=12V IN4,5VREF - GIO2 =GVO2/Rcs[A/V] ILIMIT2=VLIMIT2/Rcs[A] MUTE=5V IO=0.5A SPINVREF - GIO1 =GVO1/Rcs[A/V] ILIMIT1F=VLIMIT1F/Rcs[A] ILIMIT1R=VLIMIT1R/Rcs[A] - 10.6 -80 0 0 0.85 0.4 0.22 1.3 0.6 - 3.4 10.3 -80 0 0 0.85 0.43 -100 11.1 -40 40 - 1.0 0.5 0.28 - 0.85 - 3.8 10.8 -40 40 - 1.0 0.5 - - 0 80 5 1.15 0.6 0.34 3.7 1.2 30 - - 0 80 5 1.15 0.58 100 V mA mA V V/V V V V V mA V V mV mV V V/V V ICC IMUTE VMON VMOFF IMUTEIN FOSC VREFIN IREFIN VSBL VSBH ISB1 ISB2 MUTE=0V MUTE=variation MUTE=variation MUTE=5V COSC=330pF - VREF=1.65V SB=variation SB=variation SB=5V(FAN8732G/BG) SB=5V(FAN8732CG) - - - - 2.5 - - 1.0 -10 - 2.5 - - 50 0 - - - 65 - - - - - - 70 30 0.8 - 500 - 3.3 +10 0.8 - 500 1.2 mA Symbol Condition Min. Typ. Max. Unit
A
V V
A
KHz V
V
V V
A
mA
CH4/CH5 DRIVE PART (TYPICALLY SLED DRIVER)
A
10
FAN8732G/FAN8732BG/FAN8732CG
Electrical Characteristics (Ta = 25C) (Continued)
(Ta=25C, SVCC =PVCC1=5V, PV CC2=PVCC3=12V unless otherwise noted) Parameter Maximum Output Voltage 31 Control Voltage Input Range3 Closed Loop Voltage Gain Output Offset Voltage Symbol VOM31 VIN3 GVO3 VOO1 Condition IO=0.5A, PVCC2=12V - - VREF=IN1=IN2=1.65V IO=0.5A, PVCC1=5V, PVCC2=12V IO=0.5A, PVCC1=PVCC2=12V - - VREF=IN3=1.65V Min. 3.8 0 20.2 -45 Typ. 4.2 - 21.6 - Max. - 5 22.8 45 Unit V V dB mV
CH1,CH2 DRIVE PART (TYPICALLY ACTUATOR DRIVER)
CH3 DRIVE PART (TYPICALLY LOADING DRIVER) Maximum Output Voltage 41 Maximum Output Voltage 42 Control Voltage Input Range4 Closed Loop Voltage Gain Output Offset Voltage VOM41 VOM42 VIN4 GVO4 VOO2 3.95 6.2 0 16.7 -50 4.2 6.7 - 18.1 - - - 5 19.3 50 V V V dB mV
11
FAN8732G/FAN8732BG/FAN8732CG
Application Information
1. Torque Control & Output Current Control Of 3-phase Bldc Motor
PVCC2
Inside IC
+ Vcs + Torque AMP REXT1 SPIN REXT2
+ -
Rcs
LPF Io
VAMP R IOMAX Clock Generator S Q Commutator 6
Driver
M
Hall sensor
VREF
1) By amplifying the voltage difference between V REF and SPIN from Servo IC(or DSP), the Torque AMP produces the input voltage(VAMP) which is input current command. 2) The output current (IO) is converted into the voltage (V CS) through the sense resistor (RCS) and compared with the VAMP. 3) The clock generator has the RS latch set periodically, this makes output driver on state and when the V CS and the VAMP is equal the state becomes off. 4) By the negative feedback loop, the sensed output voltage V CS equals to the VAMP. 5) Commutating sequence is selected by hall sensor inputs, and the minimum hall input voltage is 60mV. 6) The gain and limit current are calculated as below table.(Gvo=1[V/V]) Forward limit current
0.5 ---------Rcs
Reverse limit current
0.28 ----------Rcs
Input/Output gain[A/V]
R EXT2 G VO ----------------------------------------------- * ------------R R +R EXT1 EXT2 CS
Remark
R EXT2 ----------------------------------------------R EXT1 + R EXT2
is gain scaler
7) The range of the input voltage is as shown below when Rcs=0.5, REXT1=0 and REXT2=inf.
Current [A] 1 0.56 Reverse Dead Dead zone- zone+
GIO=GVO / RCS
Forward SPIN > VREF SB=H SPIN < VREF SB=L, open -
Rotation Forward rotation Reverse brake Short brake
-40mV
0
40mV
SPIN-VREF
The input range of SPIN is 0 V ~ 5 V
12
FAN8732G/FAN8732BG/FAN8732CG
2. Torque Control & Output Current Control Of Sled Motor(2-phase Step Motor)
PVCC3
Inside IC
+ Vcs + Torque AMP REXT1 IN4(or IN5) REXT2
+ -
Rcs
LPF Io
VAMP R IOMAX Clock Generator S Q Drive Logic 4
Driver
M
VREF
1) By amplifying the voltage difference between V REF and IN4(or IN5) from Servo IC(or DSP), the Torque AMP produces the input voltage(VAMP) which is input current command. 2) The output current (I O) is converted into the voltage (VCS) through the sense resistor (R CS) and compared with the VAMP. 3) The clock generator has the RS latch set periodically, this makes output driver on state and when the V CS and the VAMP is equal the state becomes off. 4) By the negative feedback loop, the sensed output voltage V CS equals to the VAMP. 5) To avoid output upper and lower transistor's short through, switch trick is needed. Turn on delay time is 1usec, turn off delay time is 2usec and the phase delay time, when the current direction is changed, is 3usec. 6) The gain and limit current are calculated as below table.(Gvo=1[V/V]) Torque limit current
0.5---------Rcs
Input/Output gain[A/V]
R EXT2 G VO ----------------------------------------------- * ------------R EXT1 + R EXT2 R CS R EXT2 ----------------------------------------------R EXT1 + R EXT2
Remark is gain scaler
8) The range of the torque voltage is as shown below when Rcs=0.5, R EXT1=0 and REXT2=inf.
Current [A] Ilimit Reverse Dead Dead zone- zone+
GIO=GVO / R CS
Forward
-40mV
0
40mV
IN4/IN5-VREF
13
FAN8732G/FAN8732BG/FAN8732CG
3. CH1/CH2/CH3 Drive Part
Inside IC
R
R
6R (4R)
R 25 Vref REXT2 REXT1 27 28 40 IN1 IN2 IN3
1) The reference voltage, VREF, is given externally through pin 25. 2) The power amp circuit produces the differential output voltages and drives the two output power amplifier circuits. 3) The CH1/CH2 gain of DO- drive part of the power amp block is 6R/R=6 times(and the gain of CH3 is 4R/R=4times). The DO+ drive part of the power amp block is just inverting circuit of DO- drive part so the total gain of power amp block is 12 times that is 21.58dB(in case of CH3, gain is 8 times that is 18.06dB). 4) Power reference voltage, which is the mid-point of the drive output, is set to the half of the supply voltage. 5) When the total gain is too high, the external resistors(REXT1 & REXT2)can be used to make the gain proper. Power amp gain 12(21.58dB) Input/Output gain[V/V]
R EXT2 ----------------------------------------------- * 12 R EXT1 + R EXT2 R EXT2 ----------------------------------------------R EXT1 + R EXT2
14
+
30 SVCC
R
-
Power reference
-
-
+
36 34 31 DO
M Power amp
DO- 37 35 30
R
+ +
6R (4R)
R
Remark is gain scaler
FAN8732G/FAN8732BG/FAN8732CG
4. Power Save & Channel Selection
MUTE/SB logic tables are as below. Logic Input Mute(pin41) L L H H SB(pin38) L H L H CH1 off off on CH2 off off on Drive Change CH3 off on off CH4 off off on CH5 off off on spindle off off on
5. SB(Short Brake Mode Selection)
When SB pin enabled(low), the brake mechanism of 3-phase spindle driver is changed to short brake.
SHORT BRAKE OPERATING SCHEME
MOTOR Vcc OFF
OFF ON
38
1K ON 20K
12
13 14
When short brake is enabled all lower output transistors are turned on and all upper output transistors are turned off, so the current due to the motor back EMF(electro motive force) is freewheeled through lower transistors and lower freewheeling diodes. It is general that the short brake is safer than the reverse brake in high speed applications. But it is not true in all cases because the current in the short brake is depend on the amount of the motor back EMF. So in high speed applications we suggest an optimal brake which is our patent. Please contact sales persons or offices if you need more information about the optimal brake.
6. TSD(Thermal Shut Down)
When the chip temperature rises up to about 160 oC(degree), all output drivers are shut down. When the chip temperature falls off to about 130 oC, then the drivers recover normal operation. TSD has the temperature hysteresis of about 30oC.
15
FAN8732G/FAN8732BG/FAN8732CG
7. FG OUTPUT
FAN8732G generates FG1X, meanwhile FAN8732BG/CG generates FG3X
8. PWM Carrier Frequency
PWM carrier frequency is made from charging and discharging a capacitor which should be connected to osc(#42) pin. You can get typical pwm carrier frequency from below table. capacitor[pF] Carrier frequency[KHz] 820 28 680 32 330 65 220 90 180 110 150 143 120 179
9. Hall Sensor Connection
Vcc
Vcc
HALL 1 HALL 1 HALL 2 HALL 3
HALL 2
HALL 3
23 VH
23 VH
16
FAN8732G/FAN8732BG/FAN8732CG
10. Spindle Part Input-output Timing Chart
H1 +
H2 +
H3 +
A1 output current (H1 -)+(H2 +)
A1 output voltage
A2 output current (H2 -)+(H3 +)
A2 output voltage
A3 output current (H3 -)+(H1 +)
A3 output voltage
The waveforms are different in accordance with motor types.
17
FAN8732G/FAN8732BG/FAN8732CG
Typical Application Circuits
Sled1 Vref Sled2 Vref
1 2 3 PVCC3 4 5 6
IN4 IN5 PVCC3
OSC
42 Mute Selection Loading Vref
MUTE IN3 PVCC1 SB DO3-
41 40 39 PVCC1 38 37
CS2 DO5+ DO5PGND3 CS1 DO4+ DO4PGND2 W V
Short Brkae Selection
M
SLED (stepping) MOTOR 7 DO3+ 36 DO135
LOADING MOTOR
M
8 9 10 11 12
FAN8732G/FAN8732BG/ FAN8732CG
DO1+ 34 PGND1 SVCC DO2+ DO233 32 31 30
FOCUS ACTUATOR
SVCC
3Phase BLDC motor
TRACKING ACTUATOR
13 14 15 16
U CS3 HW-
SGND
29 28
IN2 IN1
Tracking
27 26
Focus
HALL-W 17 HW+
SPIN
Spindle Vref
(typically 1.65V)
18 HALL-V 19 20 HALL-U 21
HVHV+ HU-
VREF
25 24 23
FG VH
HU+
PVCC2
22 PVCC2
18
FAN8732G/FAN8732BG/FAN8732CG
19
FAN8732G/FAN8732BG/FAN8732CG
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. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.
www.fairchildsemi.com
2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
8/18/03 0.0m 001 Stock#DSxxxxxxxx 2003 Fairchild Semiconductor Corporation

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