FAN8725 [FAIRCHILD]
Spindle Motor and 5-Channel Motor Driver; 主轴电机和5通道马达驱动器
| 型号： | FAN8725 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Spindle Motor and 5-Channel Motor Driver |
| 文件： | 总20页 (文件大小：261K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
FAN8725 (KA3025)
Spindle Motor and 5-Channel Motor Driver
Features
Description
The FAN8725 is a monolithic IC suitable for a 3-phase
BLDC spindle motor driver and 5-ch motor drivers which
drives the focus actuator, tracking actuator, loading motor,
stepping motor driver of the CD-media systems.
Common
• Built-in thermal shutdown circuit (TSD)
• Built-in power save circuit
• 3 Independent voltage source
• Corresponds to 3.3V or 5V DSP
Spindle
48-QFPH-1414
• Built-in hall bias
• Built-in FG signal output circuit
• Built-in rotational direction detecting circuit
• Built-in protection circuit for reverse rotation
• Built-in short brake circuit
BTL (5-channel)
• Built-in 5-CH balanced transformerless (BTL) driver
• Built-in Level shift circuit
• Independent voltage sources
• VM2 = CH1,CH2 / VM3 = CH3, CH4 ,CH5
Typical Applications
Ordering Information
• 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
Device
Package
Operating Temp.
FAN8725 48-QFPH-1414
−35°C ~ +85°C
Rev. 1.0.1
March. 2000.
©2000 Fairchild Semiconductor International
1
FAN8725 (KA3025)
Pin Assignments
48
47
46
45
44
43
42
41
40
39
38
37
H1+
1
2
3
4
5
6
36
35
34
32
32
31
DO5 -
H1-
DO5+
DO4 -
H2+
H2-
DO4+
H3+
H3-
DO3 -
DO3+
FAN8725
7
30
29
28
27
26
25
FG
DIR
PGND2
DO2 -
DO2+
DO1 -
8
SVCC1
VM1
9
10
11
12
CS1
DO1+
OUT1
PGND1
13
14
15
16
17
18
19
20
21
22
23
24
2
FAN8725 (KA3025)
Pin Definitions
Pin Number
Pin Name
H1-
I/O
I
Pin Function Description
1
Hall 1(-) input
Hall 1(+) input
Hall 2(-) input
Hall 2(+) input
Hall 3(-) input
Hall 3(+) input
2
H1+
I
3
H2+
I
4
H2-
I
5
H3+
I
6
H3-
I
7
FG
O
O
-
Frequency Generator output
Rotation direction output
Spindle Signal supply voltage
Spindle power supply
Spindle current sense
Spindle power ground
3-phase output1
8
DIR
9
SVCC1
VM1
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
-
CS1
I
PGND1
A1
-
O
O
O
-
A2
3-phase output2
A3
3-phase output3
SGND2
IN4
CH signal ground
I
OP-Amp CH 4 input(-)
OP-Amp CH 4 output
OP-Amp CH 3 input(-)
OP-Amp CH 3 output
OP-Amp CH 2 input(-)
OP-Amp CH 2 output
CH1/CH2 power supply
OP-Amp CH 1 input(-)
OP-Amp CH 1 output
Channel 1 output (+)
Channel 1 output (−)
Channel 2 output (+)
Channel 2 output (−)
CH1/CH2 power ground
Channel 3 output (+)
Channel 3 output (−)
Channel 4 output (+)
OUT4
IN3
O
I
OUT3
IN2
O
I
OUT2
VM2
O
-
IN1
I
OUT1
DO1+
DO1 -
DO2+
DO2 -
PGND2
DO3+
DO3 -
DO4+
O
O
O
O
O
-
O
O
O
3
FAN8725 (KA3025)
Pin Definitions (Continued)
Pin Number
Pin Name
DO4 -
DO5+
DO5-
PGND3
IN5
I/O
O
O
O
-
Pin Function Description
Channel 4 output (−)
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
Channel 5 output (+)
Channel 5 output (−)
CH3/CH4/CH5 power ground
OP-Amp CH 5 input(-)
OP-Amp CH 5 output
CH3/CH4/CH5 power supply
CH Signal supply voltage
BTL reference voltage
Short brake
I
OUT5
VM3
O
-
SVCC2
VREF
SB
-
I
I
PS
I
Power save
ECR
I
Torque control reference
Torque control
EC
I
PC1
-
Phase compensation capacitor
Hall bias
VH
I
Notes:
BTL drive part symbol(+,- outputs of drives) is determined according to the polarity of input pin.
(For example, if the voltage of pin 24 is high, the output of pin 26 is high)
4
FAN8725 (KA3025)
Internal Block Diagram
48
44
43
42
41
40
39
38
37
47
46
45
Hall
Bias
36
1
2
H1+
H1 -
H2+
H2 -
H3+
H3 -
DO5 -
CH5
X8
35
DO5+
Absolute Values
Current
34
3
4
DO4 -
CH4
X8
Sense Amp
33
DO4+
DO3 -
DO3+
Output
Current Limit
5
6
32
31
CH3
X8
R
VM3
VM2
R
VM3
Detection
VM3
VM2
FIN(GND)
PGND2
FIN(GND)
Logic
R
R
VM2
Reverse
Rotation
7
8
30
29
FG
Short
Brake
CH2
X5
DIR
DO2 -
DO2+
DO1 -
DO1+
OUT1
9
28
27
SVCC1
VM1
Distributor
CH1
X5
10
11
12
26
25
CS1
PGND1
Driver
19
20
13
14
16
18
21
24
15
17
22
23
5
FAN8725 (KA3025)
Equivalent Circuits (Spindle Part)
HALL INPUT
DRIVER OUTPUT
Pin 10
Pin 11
1KΩ
1KΩ
22.5Ω
22.5Ω
15KΩ
Pin
2,4,6
Pin
1,3,5
Pin 13,14,15
TORQUE CONTROL INPUT
HALL BIAS INPUT
22.5Ω
22.5Ω
1KΩ
1KΩ
5Ω
Pin 45
+
-
Pin 48
Pin 46
100KΩ
POWER SAVE INPUT
SHORT BRAKE INPUT
22.5Ω
1KΩ
22.5Ω
40KΩ
Pin 43
Pin 44
30KΩ
20KΩ
FG OUTPUT
DIR OUTPUT
Vcc
Vcc
10KΩ
30KΩ
22.5Ω
22.5Ω
7
Pin 8
Pin
6
FAN8725 (KA3025)
Equivalent Circuits (BTL Part)
OP-AMP INPUT
OP-AMP OUTPUT
20KΩ
20KΩ
Pin
25,22,20,18,39
Pin
24,21,
19,17,38
22.5Ω
1KΩ
DRIVE OUTPUT
VREF
CH-O
(Pin 26,28,31,33,35 )
20kΩ
20KΩ
20KΩ
40kΩ
Pin 42
CH-O
(Pin 27,29,32,34,36)
22.5Ω
1KΩ
20kΩ
7
FAN8725 (KA3025)
Absolute Maximum Ratings (Ta = 25°C)
Parameter
Supply Voltage (Spindle Signal)
Supply Voltage (BTL Signal)
Supply Voltage (Spindle Motor)
Supply Voltage (BTL CH1/2)
Supply Voltage (BTL CH3/4/5)
Power dissipation
Symbol
Value
Unit
V
SV
7
15
CC1max
CC2max
M1max
M2max
M3max
SV
V
V
15
V
V
15
V
V
15
V
P
D
3.0 note
-35 ~ +85
-55 ~ +150
1.3
W
°C
°C
A
Operating Temperature Range
Storage temperature Range
Maximum Output Current (Spindle)
Maximum Output Current (BTL)
T
OPR
T
STG
I
I
Omaxa
Omaxb
0.6
A
NOTE:
1. When mounted on 70mm × 70mm × 1.6mm PCB (Phenolic resin material)
2. Power dissipation is reduced 24mW/°C for using above Ta=25°C
3. Do not exceed P and SOA (Safe Operating Area)
D
Power Dissipation Curve
Pd [mW]
3,000
2,000
1,000
0
0
25
50
85 100
125
150
175
Ambient Temperature, Ta [°C]
Recommended Operating Conditions (Ta = 25°C)
Parameter
Symbol
SVCC1
SVCC2
VM1
Min.
Typ.
Max.
5.5
Unit
Operating Supply Voltage (Spindle Signal)
Operating Supply Voltage (BTL Signal)
Operating Supply Voltage (Spindle Motor)
Operating Supply Voltage (BTL CH1/2)
Operating Supply Voltage (BTL CH3/4/5)
4.5
10.8
10.8
4.5
–
–
–
–
–
V
V
V
V
V
13.2
13.2
VM2
SVCC2
SVCC2
VM3
4.5
8
FAN8725 (KA3025)
Electrical Characteristics (Ta = 25°C)
Parameter
FULL CHIP
Symbol
Condition
Min.
Typ.
Max.
Units
Quiescent Circuit Current 1
Quiescent Circuit Current 2
Quiescent Circuit Current 3
POWER SAVE
ICC1
ICC2
ICC3
FULL CHIP (PS=0V)
SPINDLE (PS=5V)
–
–
–
0
5
0.2
10
30
mA
mA
mA
BTL
( PS=5V)
20
On Voltage Range
Off Voltage Range
HALL BIAS
VPSon
VPSoff
L-H Circuit On
H-L Circuit Off
2.5
–
–
–
Vcc
1.0
V
V
Hall Bias Voltage
VHB
I
=20mA
HB
0.4
1.0
1.8
V
HALL AMP
Hall Bias Current
IHA
-
-
-
-
–
1.5
100
5
0.5
–
2
4.0
–
uA
V
Common Mode Input Range
Minimum in Level
VHAR
VINH
VHYS
–
mVpp
mVpp
H1 Hysteresis
20
40
TORQUE CONTROL
Ecr In Voltage Range
Ec In Voltage Range
Offset Voltage (-)
ECR
EC
-
-
0.2
0.2
-80
20
–
4.0
4.0
-20
80
V
V
–
ECoff-
ECoff+
ECin
E
E
=1.9V
-50
50
mV
mV
uA
C
Offset Voltage (+)
=1.9V
CR
E
E
In Current
In Current
E =1.9V
-3
-0.5
-0.5
0.70
–
C
C
ECRin
GEC
E
E
=1.9V
-3
–
uA
CR
CR
CR
In/output Gain
=2.5V, R =0.5Ω
CS
0.56
0.84
A / V
FG
FG Output Voltage (H)
FG Output Voltage (L)
Duty(Reference Value)
OUTPUT BLOCK
VFGh
VFHl
I
I
= -10uA
=10uA
4.5
–
4.9
–
V
V
V
FG
CC
0.5
FG
R
=0.5Ω
CS
50
%
Saturation Voltage (upper TR)
Saturation Voltage (lower TR)
Torque Limit Current
DIRECTION DETECTOR
DIR Output Voltage (H)
Dir Output Voltage (L)
SHORT BRAKE
VOh
VOl
ITL
I = -300mA
–
–
1.0
0.4
700
1.4
0.7
840
V
V
O
I =300mA
O
R =0.5Ω
CS
560
mA
VDIRh
VDIRl
I
I
=-10uA
=10uA
4.5
–
4.7
–
V
V
FG
0.5
FG
On Voltage Range
VSBon
VSBoff
-
-
2.5
0
–
–
V
V
V
CC
Off Voltage Range
1.0
9
FAN8725 (KA3025)
ELECTRICAL CHARACTERISTICS (continued)
BTL Drive Part (Ta=25°C, SV
=12V, V =5V, V =12V, R =8, 24Ω)
CC2
M2
M3
L
Parameter
CH1/CH2
Symbol
Condition
Min.
Typ.
Max.
Units
Output Offset Voltage1,2
VOF1/2
VOM1/2
GVC1/2
-
-95
3.6
–
95
–
mV
V
Maximum Output Voltage1,2
Voltage Gain
V
=5V,RL=8Ω
4.0
M2
V =0.1Vrms, 1kHz
IN
12.0
14.0
16.0
dB
CH3/CH4/CH5
Output Offset Voltage3,4,5
VOF3/4/5
VOM3/4/5
-
-95
8.4
–
95
–
mV
V
Maximum Output
Voltage3,4,5
V
=12V,RL=24Ω
M3
10.5
Voltage Gain
GVC3/4/5
V =0.1Vrms, 1kHz
IN
16.0
18.0
20.0
11.0
dB
OP-AMP CIRCUIT
Common Mode Input Range
Input Bias Current
VICM
ΙB
-
-
-
-
-
-
0
-300
-
–
V
nA
V
-30
0.2
11
Low Level Output Voltage
High Level Output Voltage
Output Driving Source Current
Output Driving Sink Current
VCL
0.5
–
VOH
10.0
1
V
ISOURCE
ISINK
4.0
10
–
mA
mA
5
–
10
FAN8725 (KA3025)
Application Information
1. TORQUE CONTROL & OUTPUT CURRENT CONTROL
V
+
M
Rcs
Vcs
V
M
-
+
-
Current Sense AMP
Io
VAMP
Torque AMP
-
Gain
Controller
Ecr
Driver
+
-
+
M
ECR-EC
TSD
Ec
1) By amplifying the voltage difference between Ec and Ecr from Servo IC, the Torque Sense AMP produces the input volt-
age(V ) for the Current Sense AMP.
AMP
2) The output current (I ) is converted into the voltage (V ) through the sense resistor (R ) and compared with the V
.
O
CS CS AMP
By the negative feedback loop, the sensed output voltage, VCS is equal to the input V . The output current (I ) is lin-
AMP
O
early controlled by the input V
.
AMP
3) The signals, E and E can control the velocity of the Motor by controlling the output current (I ) of the Driver.
C
CR
O
4) The range of the torque voltage is as shown below.
Current
[mA]
Forward
Reverse
Rotation
E
E
> Ec
< Ec
Forward rotation
CR
700
Stop after detecting re-
verse rotation
CR
Ecoff-
Ecoff+
6
-1.0 V
The input range of E
0
50mV
-50mV
1.0 V
E
-E
C
CR
E
is 0.2 V ~ 4.0 V ( R
= 0.5[Ω] )
CR,
C
CS
11
FAN8725 (KA3025)
2. SHORT BRAKE
MOTOR
OFF
Vcc
13
43
1KΩ
ON
14
15
OFF
ON
20KΩ
Pin # 43
HIGH
Short Brake
ON
LOW
OFF
When the pick-up mechanism moves from the inner to the outer spindle of the CD, the Brake function of the reverse voltage is
commonly employed to decrease the rotating velocity of the Spindle Motor.
However, if the Spindle Motor rotates rapidly, the Brake function of the reverse voltage may produce much heat at the Drive
IC.
To enhance the braking efficiency, the Short Brake function is added to FAN8725. When the Short Brake function is activated,
all upper Power TRs turn off and all lower Power TRs turn on, so as to make the rotating velocity of the motor slow down. But
FG and DIR functions continue to operate normally.
3. POWER SAVE
Vcc
IC bias
44
Start
Stop
40KΩ
30KΩ
Pin # 44
HIGH
Power Save
Motor Drive Ouput Activated
Sleep mode
LOW
When PowerSave(PS) function is activated, the chip is deactivated.
12
FAN8725 (KA3025)
4. TSD (THERMAL SHUTDOWN)
Gain
Controller
BIAS
Q2
When the chip temperature rises up to about 175C(degree), the Q2 turns on and the output driver shuts down. When the chip
temperature falls off to about 150C(degree), then the Q2 turns off and the driver operates normally. TSD has the temperature
hysteresis of about 25C(degree).
-- The TSD circuit shuts down all the power drives(spindle and BTL power drives) excluding both CH1 and CH2 power
drives(actuator part).
5. ROTATIONAL DIRECTION DETECTION
Vcc
8
Rotation
Forward
Reverse
DIR
Low
High
DIR
8
+
-
H2+
H2-
D
Q
CK
+
H3+
H3-
-
D-F/F
1) The forward and the reverse rotations of the CD are detected by using the D-F/F and the truth table is shown in the above.
2) The rotational direction of the CD can be explained by the output waveform of the Hall sensors. Let the three outputs of
Hall sensors be H1, H2 and H3 respectively.
When the spindle rotates in reverse direction, the Hall sensor output waveform are shown in Fig.(a). Thus the phases
ordered in H1→H2→H3 with a 120° phase difference.
H1
H2
H3
(a) Reverse rotation
13
FAN8725 (KA3025)
On the other hand, if the spindle rotates in forward rotation, the phase relationship is H3->H2->H1 as shown in Fig.(b)
H1
H2
H3
(b) Forward rotation
The direction output ,detector is Low, when the spindle rotates forward, and HIGH in the reverse direction.
6. REVERSE ROTATION PREVENTION
Current
Sense
Amp
EC
+
-
ECR
H2+
H2-
+
-
Low Active
A
D
Q
CK
H3+
H3-
+
-
Gain
Controller
Driver
M
D-F/F
1) When the output of the OR Gate, A is LOW, it steers all the output current of the current sense Amp to the Gain Controller
zero. The output current of the Driver becomes zero and the motor stops.
2) 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 EC>ECR, then the motor rotates slowly by the reverse commutation in the Driver. When
the motor rotates in reverse direction, the D-F/F output becomes Low and the OR Gate output, becomes LOW. This pre-
vents the motor from rotating in reverse direction. The operation principle is shown in the table and the flow chart.
14
FAN8725 (KA3025)
Forward rotation at EC < ECR
Rotating speed is decreased due to reverse torque at EC >ECR. (Motor still rotates forward)
At the moment that the motor rotates in reverse, the reverse rotation preventer makes the output power transistor open.
Rotating reverse at short time due to motor inertia
Stop within 1/6 turn reverse rotating
Reverse Rotation Preventer
D-F/F
(Q)
Rotation
H2
H3
E
>E
CR
E >E
C
C
CR
Forward
Reverse
H
L
H→L
H→L
H
L
Forward
-
-
Brake and Stop
7. FG OUTPUT
Vcc
7
FG
H3+
H3-
+
-
8. HALL SENSOR CONNECTION
Vcc
Vcc
HALL 1
HALL 1
HALL 2
HALL 3
HALL 2
HALL 3
48
VH
48
VH
15
FAN8725 (KA3025)
9. CONNECT A BYPASS CAPACITOR, FROM ALL THE SUPPLY VOLTAGE SOURCES TO GROUND.
(Typically 0.1uF, or even higher)
SVcc1, SVcc2, VM1, VM2, VM3
0.1uF
10. THE HEAT RADIATION FIN IS CONNECTED TO THE INTERNAL GND OF THE PACKAGE.
Connect the FIN to the external GND.
16
FAN8725 (KA3025)
11. 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
17
FAN8725 (KA3025)
12. BTL DRIVE PART
−
M
27 29 32 34 36
26 28 31 33 35
DO
DO+
Power amp
25K
25K
(40K)
(40K)
−
−
25K 25K
(40K)
(40K)
+
23 40
VM2
R
18 20 22 24 39
−
(VM3)
VM2
R
Error
Amp
(VM3)
R2
−
+
42
Vref
−
R1
19
17
21 24 38
• The reference voltage REF is given externally through pin 42.
• The error amp output signal is amplified by R2 / R1 times and then fed to the power amp circuit.
• The power amp circuit produces the differential output voltages and drives the two output power amplifier circuit.
• Since the differential gain of the output amplifiers of CH1/CH2 is equal to 2 × (25K / 10K) , the output signal of the error
amp is amplified by (R2 / R1) × 5.
• Since the differential gain of the output amplifiers of CH3/CH4/CH5 is equal to 2 × (40K / 10K) , the output signal of the
error amp is amplified by (R2 / R1) × 8.
• If the total gain is insufficient, the input error amp can be used to increase the gain.
• The CH1/CH2 are generally used as actuator drive circuit so this channels are not affected by TSD circuit.
18
FAN8725 (KA3025)
Typical Application Circuits
SLED2
SIGNAL
SERVO
SIGNAL
SHORT
BRAKE
SVCC2 VM3
POWER
SAVE
48
47
46
45
44
43
42
41
40
39
38
37
1
2
3
4
5
6
DO5 - 36
H1+
HALL1
DO5+ 35
DO4 - 34
DO4+ 33
DO3 - 32
DO3+ 31
H1 -
H2+
H2 -
H3+
H3 -
SLED
(stepping)
MOTOR
M
HALL2
HALL3
LOADING
MOTOR
M
FAN8725
30
PGND2
7
8
9
FG
DO2 - 29
DO2+ 28
DIR
TRACKING
ACTUATOR
SVCC1
SVCC
1
27
DO1 -
10 VM1
11 CS1
FOCUS
ACTUATOR
DO1+ 26
25
OUT1
PGND1
VM1
12
13
14
15
16
17
18
19
20
21
22
23
VM2
24
SLED1
SIGNAL
LOADING
SIGNAL
TRACKING
SIGNAL
FOCUS
SIGNAL
19
FAN8725 (KA3025)
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.
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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
INTERNATIONAL. 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.
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.
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2000 Fairchild Semiconductor International
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