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Электронный компонент: FAN8732GX

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2003 Fairchild Semiconductor Corporation
www.fairchildsemi.com
Rev. 1.0.1
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
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
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
Ordering Information
X:Tape & Reel type
FAN8732G:FG1X
FAN8732BG:FG3X
FAN8732CG:FG3X,Pull down resistor at SB pin
Device
Package
Operating Temp.
FAN8732G
42-SSOP-EP
-
20
C ~ +75
C
FAN8732GX
42-SSOP-EP
-
20
C ~ +75
C
FAN8732BG
42-SSOP-EP
-
20
C ~ +75
C
FAN8732BGX
42-SSOP-EP
-
20
C ~ +75
C
FAN8732CG
42-SSOP-EP
-
20
C ~ +75
C
FAN8732CGX
42-SSOP-EP
-
20
C ~ +75
C
FAN8732G/FAN8732BG/FAN8732CG
Spindle motor and 5-CH actuator driver
[Spindle(PWM), Sled 2-CH(PWM) 3-CH(Linear)]
FAN8732G/FAN8732BG/FAN8732CG
2
Pin Assignments
1
2
3
4
5
6
7
8
9
33
32
31
36
35
34
39
38
37
42
41
40
FAN8732G/
IN4
IN5
PVCC3
CS2
DO5+
DO5-
PGND3
CS1
DO4+
DO4-
PGND2
W
10
11
12
OSC
MUTE
IN3
PVCC1
SB
DO3-
DO3+
DO1-
DO1+
PGND1
DO2+
DO2-
15
16
17
V
U
CS3
HW-
HW+
HV-
HV+
HU-
18
19
20
HU+
26
25
24
29
28
27
SVCC
SGND
IN2
IN1
SPIN
VREF
FG
VH
PVCC2
21
14
13
22
23
30
FAN8732BG/
FAN8732CG
FAN8732G/FAN8732BG/FAN8732CG
3
Pin Definitions
Pin Number
Pin Name
I/O
Pin Function Description
1
IN4
I
CH4 input (typically sled1 input)
2
IN5
I
CH5 input (typically sled2 input)
3
PVCC3
-
Power supply for CH4 and CH5
4
CS2
-
Current sense for CH5
5
DO5 +
O
CH5 + drive output (typically sled2 output +)
6
DO5 -
O
CH5 - drive output (typically sled2 output -)
7
PGND3
-
Power ground 3
8
CS1
-
Current sense for CH4
9
DO4 +
O
CH4 + drive output (typically sled1 output +)
10
DO4 -
O
CH4 - drive output (typically sled1 output -)
11
PGND2
-
Power ground 2
12
W
O
3-phase output W for spindle
13
V
O
3-phase output V for spindle
14
U
O
3-phase output U for spindle
15
CS3
-
Current sense for spindle driver
16
HW -
I
Hall W(-) input
17
HW +
I
Hall W(+) input
18
HV -
I
Hall V(-) input
19
HV +
I
Hall V(+) input
20
HU -
I
Hall U(-) input
21
HU +
I
Hall U(+) input
22
PVCC2
-
Power supply for spindle driver
23
VH
I
Hall bias
24
FG
O
Frequency generator
(FAN8732G:FG1X, FAN8732BG:FG3X)
25
VREF
I
Reference voltage input
26
SPIN
I
Spindle torque control
27
IN1
I
Channel 1 input (typically focus input)
28
IN2
I
Channel 2 input (typically tracking input)
29
SGND
-
Signal ground
30
DO2 -
O
CH2 - drive output (typically tracking output +)
31
DO2 +
O
CH2 + drive output (typically tracking output -)
32
SVCC
-
Power supply for signal block and CH1, CH2
33
PGND1
-
Power ground 1
FAN8732G/FAN8732BG/FAN8732CG
4
Pin Definitions
(Continued)
Pin Number
Pin Name
I/O
Pin Function Description
34
DO1 +
O
CH1 + drive output ((typically focus output +)
35
DO1 -
O
CH1 - drive output (typically focus output -)
36
DO3 +
O
CH3 + drive output (typically loading output +)
37
DO3 -
O
CH3 - drive output (typically loading output -)
38
SB
I
Short Brake mode selection
39
PVCC1
-
Power supply for CH3
40
IN3
I
Channel 3 input (typically loading input)
41
MUTE
I
All channel mute
42
OSC
I
PWM carrier frequency set
FAN8732G/FAN8732BG/FAN8732CG
5
Internal Block Diagram
PVCC2
PGND1
PVCC1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
IN4
IN5
PVCC3
DO5+
DO5-
PGND3
CS1
DO4+
DO4-
V
U
CS3
HW-
HW+
HV-
HV+
HU-
HU+
CS2
PGND2
W
42
41
40
39
38
37
36
35
34
33
32
31
30
28
27
26
25
24
23
22
29
VH
FG
VREF
SPIN
IN1
IN2
SGND
SVCC
DO2-
DO2+
DO1+
DO1-
DO3+
DO3-
SB
IN3
MUTE
OSC
6
6
6
6
4
4
Bootstrap
Regulator
Hall
bias
TSD
LPF
H bridge
PWM Control
LPF
OSC
OSC
OSC
OSC
Focus, Tracking,
Loading block
Spindle
power
PVCC3
Spindle
power
H
bridge
Oscillator
Ha
ll Am
p
All mute
Short Brake Mode
IN3
PWM Control
C
o
mmu
ta
to
r
& Po
w
e
r d
r
i
v
e
r
LPF
Reverse
detector
Frequency
generator
PWM Control
I
OMAX
R
S
Q
Drive
Logic
Gm
-
+
+
-
-
+
FAN8732G/FAN8732BG/FAN8732CG
6
Equivalent Circuits
Sled & Spindle Input
Actuator & Loading Input
Hall Input
Current Sense Input
Hall Bias Input
FG Output
Vref Input
Drive Output
2K
1
2
26
SVCC
2K
27 28 40
SVCC
2K
SVCC
16 17 18
19 20 21
4
8
15
23
SVCC
24
SVCC
2K
25
SVCC
2K
2K
5
6
12 14
30 31 34 35
36 37
FAN8732G/FAN8732BG/FAN8732CG
7
Equivalent Circuits
(Continued)
Mute/SB Input(FAN8732G/BG)
Oscillation Input
SB Input(FAN8732CG)
8K
41
30K
12K
38
2K
42
SVCC
2K
2K
8K
30K
12K
38
10K
FAN8732G/FAN8732BG/FAN8732CG
8
Absolute Maximum Ratings (Ta = 25
C)
Note:
1. Case 1: Single layer PCB with 1 signal plane only. PCB size is 76mm
114mm
1.6mm.
2. Case 2: Multi layer PCB with 1 signal, 1 power and 1 ground planes. PCB size is 76mm
114mm
1.6mm. Cu planes size for
power and ground is 74mm
62mm
0.035mm.
3. These are experimental datum.
4. Power dissipation reduce rate of the case 1: -15.2mW/
C(Ta
25
C)
5. Power dissipation reduce rate of the case 2: -26.4mW/
C(Ta
25
C)
6. Should not exceed P
D
and SOA (Safe Operating Area)
Power Dissipation Curve
Parameter
Symbol
Value
Unit
Supply Voltage (Signal block & CH1,2)
SV
CCmax
7
V
Supply Voltage (Power for CH3)
PV
CC1max
15
V
Supply Voltage (Spindle driver)
PV
CC2max
15
V
Supply Voltage (Power for CH4 & 5)
PV
CC3max
15
V
Power dissipation
P
D
1.9 / 3.3
NOTE
W
Operating Temperature Range
T
OPR
-20 ~ +75
C
Storage temperature Range
T
STG
-40 ~ +150
C
Maximum Output Current (Spindle)
I
Omax1
1.5
A
Maximum Output Current
(Focus, Tracking, Loading)
I
Omax2
1.0
A
Maximum Output Current (Sled)
I
Omax3
0.5
A
Case 1
Case 2
Remark
Pd is measured
base on the JE-
DEC/STD(JESD
51-2)
Pd=1.9W
Pd=3.3W
PCB(glass-epoxy)
Power
plane(Cu)
GND plane(Cu)
175
150
125
100
50
25
0
1,000
2,000
3,000
Pd [mW]
Ambient Temperature, Ta [
C]
0
75
case2
case1
SOA
FAN8732G/FAN8732BG/FAN8732CG
9
Recommended Operating Conditions (Ta = 25
C)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Operating Supply Voltage (Signal block & CH1,2)
SV
CC
4.5
5
7
V
Operating Supply Voltage (Power for CH3)
PV
CC1
4.5
12
13.2
V
Operating Supply Voltage (Spindle driver)
PV
CC2
6
12
13.2
V
Operating Supply Voltage (Power for CH4,5)
PV
CC3
4.5
12
13.2
V
Output current(Spindle)
I
O1
-
0.5
1.0
A
Output current(Focus, Tracking, Loading)
I
O2
-
0.5
0.8
A
Output current(Sled)
I
O3
-
0.25
0.4
A
PWM carrier frequency
F
osc
30
-
120
KHz
FAN8732G/FAN8732BG/FAN8732CG
10
Electrical Characteristics (Ta = 25
C)
(Ta=25
C, SV
CC
=PV
CC1
=5V, PV
CC2
=PV
CC3
=12V unless otherwise noted)
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit
COMMON PART
Quiescent Circuit Current
I
CC
-
-
50
70
mA
Mute On Current
I
MUTE
MUTE=0V
-
0
30
A
Mute On Voltage
V
MON
MUTE=variation
-
-
0.8
V
Mute Off Voltage
V
MOFF
MUTE=variation
2.5
-
-
V
Mute Input Current
I
MUTEIN
MUTE=5V
-
-
500
A
PWM Carrier Frequency
F
OSC
C
OSC
=330pF
-
65
-
KHz
REF input voltage range
V
REFIN
-
1.0
-
3.3
V
REF input current range
I
REFIN
V
REF
=1.65V
-10
-
+10
V
SB Low Voltage
V
SBL
SB=variation
-
-
0.8
V
SB High Voltage
V
SBH
SB=variation
2.5
-
-
V
SB Input Current1
I
SB1
SB=5V(FAN8732G/BG)
-
-
500
A
SB Input Current2
I
SB2
SB=5V(FAN8732CG)
-
-
1.2
mA
SPINDLE DRIVE PART
Maximum Output Voltage1
V
OM1
I
O
=0.5A
10.6
11.1
-
V
Control Voltage Deadzone11
V
DEAD11
SPIN<VREF
-80
-40
0
mA
Control Voltage Deadzone12
V
DEAD12
SPIN>VREF
0
40
80
mA
Control Voltage Input Range1
V
IN1
-
0
-
5
V
Voltage Gain1
G
VO1
G
IO1
=G
VO1
/Rcs[A/V]
0.85
1.0
1.15
V/V
Control Voltage Limit 1F
V
LIMIT1F
I
LIMIT1F
=V
LIMIT1F
/Rcs[A]
0.4
0.5
0.6
V
Control Voltage Limit 1R
V
LIMIT1R
I
LIMIT1R
=V
LIMIT1R
/Rcs[A]
0.22
0.28
0.34
V
Hall Amp Common Mode
Input Range
VH
COM
-
1.3
-
3.7
V
Hall Bias Output Voltage
V
VH
I
VH
=10mA
0.6
0.85
1.2
V
VH pin Sink Current
I
VH
MUTE-5V
-
-
30
mA
CH4/CH5 DRIVE PART (TYPICALLY SLED DRIVER)
Maximum Output Voltage21
V
OM21
IO=0.5A, PV
CC3
=5V
3.4
3.8
-
V
Maximum Output Voltage22
V
OM22
IO=0.5A, PV
CC3
=12V
10.3
10.8
-
V
Control Voltage Deadzone21
V
DEAD21
IN4,5<VREF
-80
-40
0
mV
Control Voltage Deadzone22
V
DEAD22
IN4,5>VREF
0
40
80
mV
Control Voltage Input Range2
V
IN2
-
0
-
5
V
Voltage Gain2
G
VO2
G
IO2
=G
VO2
/Rcs[A/V]
0.85
1.0
1.15
V/V
Control Voltage Limit 2
V
LIMIT2
I
LIMIT2
=V
LIMIT2
/Rcs[A]
0.43
0.5
0.58
V
Output Leak Current
I
LEAK
MUTE=5V
-100
-
100
A
FAN8732G/FAN8732BG/FAN8732CG
11
Electrical Characteristics (Ta = 25
C)
(Continued)
(Ta=25
C, SV
CC
=PV
CC1
=5V, PV
CC2
=PV
CC3
=12V unless otherwise noted)
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit
CH1,CH2 DRIVE PART (TYPICALLY ACTUATOR DRIVER)
Maximum Output Voltage 31
V
OM31
I
O
=0.5A, PV
CC2
=12V
3.8
4.2
-
V
Control Voltage Input Range3
V
IN3
-
0
-
5
V
Closed Loop Voltage Gain
G
VO3
-
20.2
21.6
22.8
dB
Output Offset Voltage
V
OO1
VREF=IN1=IN2=1.65V
-45
-
45
mV
CH3 DRIVE PART (TYPICALLY LOADING DRIVER)
Maximum Output Voltage 41
V
OM41
I
O
=0.5A, PV
CC1
=5V,
PV
CC2
=12V
3.95
4.2
-
V
Maximum Output Voltage 42
V
OM42
I
O
=0.5A, PV
CC1
=PV
CC2
=12V
6.2
6.7
-
V
Control Voltage Input Range4
V
IN4
-
0
-
5
V
Closed Loop Voltage Gain
G
VO4
-
16.7
18.1
19.3
dB
Output Offset Voltage
V
OO2
VREF=IN3=1.65V
-50
-
50
mV
FAN8732G/FAN8732BG/FAN8732CG
12
Application Information
1. Torque Control & Output Current Control Of 3-phase Bldc Motor
1) By amplifying the voltage difference between V
REF
and SPIN from Servo IC(or DSP), the Torque AMP produces the
input voltage(V
AMP
) which is input current command.
2) The output current (I
O
) is converted into the voltage (V
CS
) through the sense resistor (R
CS
) and compared with the V
AMP
.
3) The clock generator has the RS latch set periodically, this makes output driver on state and when the V
CS
and the V
AMP
is
equal the state becomes off.
4) By the negative feedback loop, the sensed output voltage V
CS
equals to the V
AMP
.
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])
7) The range of the input voltage is as shown below when Rcs=0.5
,
R
EXT1
=0 and R
EXT2
=inf.
Forward limit current
Reverse limit current
Input/Output gain[A/V]
Remark
is gain scaler
+
-
Torque AMP
V
REF
SPIN
Commutator
Driver
M
Rcs
Vcs
+
-
Io
V
AMP
+
-
LPF
R
S
Q
Clock
Generator
Hall sensor
R
EXT1
R
EXT2
PVCC2
Inside IC
I
OMAX
6
0.5
Rcs
-----------
0.28
Rcs
-----------
R
EXT2
R
EXT1
R
EXT2
+
------------------------------------------------
G
VO
R
CS
--------------
R
EXT2
R
EXT1
R
EXT2
+
------------------------------------------------
Forward
Dead
Dead
Reverse
Current
[A]
0
SPIN-V
REF
The input range of SPIN is 0 V ~ 5 V
1
40mV
-40mV
zone+
zone-
0.56
G
IO
=G
VO
/ R
CS
Rotation
SB=H
SPIN
> V
REF
Forward rotation
SPIN
< V
REF
Reverse brake
SB=L,
open
-
Short brake
FAN8732G/FAN8732BG/FAN8732CG
13
2. Torque Control & Output Current Control Of Sled Motor(2-phase Step Motor)
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(V
AMP
) which is input current command.
2) The output current (I
O
) is converted into the voltage (V
CS
) through the sense resistor (R
CS
) and compared with the V
AMP
.
3) The clock generator has the RS latch set periodically, this makes output driver on state and when the V
CS
and the V
AMP
is
equal the state becomes off.
4) By the negative feedback loop, the sensed output voltage V
CS
equals to the V
AMP
.
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])
8) The range of the torque voltage is as shown below when Rcs=0.5
,
R
EXT1
=0 and R
EXT2
=inf.
Torque limit current
Input/Output gain[A/V]
Remark
is gain scaler
+
-
Torque AMP
V
REF
IN4(or IN5)
Driver
M
Rcs
Vcs
+
-
Io
PVCC3
V
AMP
+
-
LPF
R
S
Q
Clock
Generator
R
EXT1
R
EXT2
Drive Logic
Inside IC
I
OMAX
4
0.5
Rcs
-----------
R
EXT2
R
EXT1
R
EXT2
+
------------------------------------------------
G
VO
R
CS
--------------
R
EXT2
R
EXT1
R
EXT2
+
------------------------------------------------
Forward
Dead
Dead
Reverse
Current
[A]
0
IN4/IN5-V
REF
I
limit
40mV
-40mV
zone+
zone-
G
IO
=G
VO
/ R
CS
FAN8732G/FAN8732BG/FAN8732CG
14
3. CH1/CH2/CH3 Drive Part
1) The reference voltage, V
REF,
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(R
EXT1
& R
EXT2
)can be used to make the gain proper.
Power amp gain
Input/Output gain[V/V]
Remark
12(21.58dB)
is gain scaler
+
-
+
-
M
25
27 28
Vref
Power amp
+
-
R
R
SVCC
DO
-
35 30
34 31 DO
+
30
R
R
R
6R
R
6R
IN1 IN2
R
EXT1
R
EXT2
M
Inside IC
(4R)
(4R)
36
37
40
IN3
Power reference
R
EXT2
R
EXT1
R
EXT2
+
------------------------------------------------
12
R
EXT2
R
EXT1
R
EXT2
+
------------------------------------------------
FAN8732G/FAN8732BG/FAN8732CG
15
4. Power Save & Channel Selection
MUTE/SB logic tables are as below.
5. SB(Short Brake Mode Selection)
When SB pin enabled(low), the brake mechanism of 3-phase spindle driver is changed to short brake.
When short brake is enabled all lower output transistors are turned on and all upper output transistors are turned off, so the cur-
rent 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
o
C(degree), all output drivers are shut down. When the chip temperature falls
off to about 130
o
C, then the drivers recover normal operation. TSD has the temperature hysteresis of about 30
o
C.
Logic Input
Drive Change
Mute(pin41)
SB(pin38)
CH1
CH2
CH3
CH4
CH5
spindle
L
L
off
off
off
off
off
off
L
H
off
off
on
off
off
off
H
L
on
on
off
on
on
on
H
H
38
Vcc
OFF
ON
20K
1K
MOTOR
OFF
ON
12
13
14
SHORT BRAKE OPERATING SCHEME
FAN8732G/FAN8732BG/FAN8732CG
16
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.
9. Hall Sensor Connection
capacitor[pF]
820
680
330
220
180
150
120
Carrier frequency[KHz]
28
32
65
90
110
143
179
23
Vcc
VH
HALL 1
HALL 2
HALL 3
23 VH
Vcc
HALL 1
HALL 2
HALL 3
FAN8732G/FAN8732BG/FAN8732CG
17
10. Spindle Part Input-output Timing Chart
The waveforms are different in accordance with motor types.
A2 output voltage
H1 +
H2 +
H3 +
A1 output current
(H1 -)+(H2 +)
A3 output current
(H3 -)+(H1 +)
A3 output voltage
A2 output current
(H2 -)+(H3 +)
A1 output voltage
FAN8732G/FAN8732BG/FAN8732CG
18
Typical Application Circuits
W
PGND2
DO4+
DO4-
CS1
DO5+
CS2
PVCC3
IN4
IN5
DO5-
PGND3
FAN
8732
G/
FAN
8732
BG
/
F
A
N
8
732C
G
TRACKING
ACTUATOR
FOCUS
ACTUATOR
HALL-W
HALL-V
HALL-U
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
33
31
30
32
29
28
27
26
25
24
23
22
42
41
40
39
38
37
36
35
34
HU-
HW+
HW-
CS3
V
U
HV-
HV+
HU+
DO2-
DO2+
DO1+
PGND1
DO1-
SB
PVCC1
IN3
OSC
MUTE
DO3-
DO3+
VH
SPIN
IN1
IN2
SVCC
SGND
VREF
FG
PVCC2
SLED
(stepping)
MOTOR
M
M
LOADING
MOTOR
SVCC
Focus
Spindle
Vref
(typically 1.65V)
3P
ha
s
e
BL
D
C
mo
tor
Tracking
Short Brkae
Selection
PVCC2
PVCC1
Mute
Selection
Loading
Vref
Sled1
Vref
Sled2
Vref
PVCC3
FAN8732G/FAN8732BG/FAN8732CG
19
FAN8732G/FAN8732BG/FAN8732CG
8/18/03 0.0m 001
Stock#DSxxxxxxxx
2003 Fairchild Semiconductor Corporation
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