FAN8727_技术文档

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FAN8727

Spindle + 4-CH Motor Drive IC

Features

Description

• Built-in Power Save Circuit

• Built-in Current Limit Circuit

The FAN8727 is a monolithic integrated circuit suitable for a

4-CH motor driver which drives the tracking actuator, focus

actuator, sled motor, loading motor and 3-phase BLDC

spindle motor of the MDP/CAR-MD/CAR-NAVIGATION

system.

• Built-in Thermal Shutdown Circuit (TSD)

• 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

48-QFPH-1414

• Built-in Normal OP-AMP

• Built-in 4-CH Balanced Transformerless (BTL) Driver

• Built-in BTL MUTE Circuit (CH1-2, CH3 and CH4)

• Corresponds to 3.3V DSP

Typical Applications

Ordering Information

• Mini Disk Player

Device

Package

Operating Temperature

• Digital Video Disk Player

• Car Mini Disk Player

• Car Navigation System

FAN8727 48-QFPH-1414

-35°C ~ +85°C

Rev. 1.0.2

FAN8727

Pin Assignments

48

47

46

45

44

43

42

41

40

39

38

37

VH

DO4 +

1

2

3

4

5

6

36

35

34

33

32

31

FG

DO4 −

ECR

AVM3

EC

DO3 +

VCC2

PC1

DO3 −

BTLPGND2

FAN8727

7

30

29

28

27

26

25

SIGGND

VM

BTLPGND1

DO2 +

8

CS1

DO2 −

9

SS

DO1 +

10

11

12

DIR

SB

DO1 −

DI1

13

14

15

16

17

18

19

20

21

22

23

24

2

FAN8727

Pin Definitions

Pin Number

Pin Name

VH

I/O

I

Pin Function Description

1

Hall Bias

2

FG

O

I

FG Signal Output

3

ECR

Torque Control Reference

Torque Control Signal

Supply Voltage

4

EC

I

5

VCC2

PC1

-

6

-

Phase Compensation Capacitor

Signal Ground

7

SIGGND

VM

-

8

-

Motor Supply Voltage

Current Sensor

9

CS1

I

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

S/S

I

Start/stop

DIR

O

I

3-Phase Rotational Direction Output

Short Brake

SB

PWRGND

A3

-

Power Ground

O

I

3-Phase Output 3

A2

3-Phase Output 2

A1

3-Phase Output 1

OPIN+

OPIN-

OPOUT

VCC1

AVM12

DI4

OP-AMP Input (+)

I

OP-AMP Input (-)

O

-

OP-AMP Output

Supply Voltage

-

BTL CH1, 2 Motor Supply Voltage

BTL Drive Input 4

I

DI3

I

BTL Drive Input 3

DI2

I

BTL Drive Input 2

DI1

I

BTL Drive Input 1

DO1-

DO1+

DO2-

DO2+

BTLPGND1

BTLPGND2

DO3-

DO3+

O

-

BTL Drive 1 Output (-)

BTL Drive 1 Output (+)

BTL Drive 2 Output (-)

BTL Drive 2 Output (+)

BTL Power Ground 1

BTL Power Ground 2

BTL Drive 3 Output (-)

BTL Drive 3 Output (+)

-

O

3

FAN8727

Pin Definitions ^(Continued)

Pin Number

Pin Name

AVM3

DO4-

I/O

Pin Function Description

BTL CH3 Motor Supply Voltage

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

-

O

I

BTL Drive 4 Output (-)

BTL Drive 4 Output (+)

BTL Drive Mute CH4

BTL Drive Mute CH3

BTL Drive Mute CH1, 2

BTL CH4 Motor Supply Voltage

BTL Bias Voltage

BTL Drive Signal Ground

Hall1(-) Input

DO4+

MUTE4

MUTE3

MUTE12

AVM4

BIAS

I

-

BTLSGND

H1-

-

I

H1+

I

Hall1(+) Input

H2-

I

Hall2(-) Input

H2+

I

Hall2(+) Input

H3-

I

Hall3(-) Input

H3+

I

Hall3(+) Input

4

FAN8727

Internal Block Diagram

48

47

46

45

44

43

42

41

40

39

38

37

1

2

3

4

36

35

34

VH

FG

DO4+

DO4-

AVM3

DO3+

DO3-

Hall

Bias

FG

Generator

ECR

EC

Hall Amp

AVM4

TSD

33

32

Detection

Logic

5

VCC2

PC1

AVM3

6

31

BTLPGND2

Absolute Values

Reverse

Rotation

Current

Sense Amp

Output

AVM12

Current Limit

SIGGND

VM

7

30

BTLPGND1

DO2+

8

9

29

28

27

AVM12

Short

Brake

Distributor

CS1

SS

DO2-

10

11

DO1+

DO1-

DI1

26

DIR

SB

12

25

13

19

20

24

16

18

21

22

23

14

15

17

5

FAN8727

Equivalent Circuits

Hall Bias

FG Signal Output

Ω

10K

1

2

Ω

25

Ω

100K

Torque Control Reference & Signal

Phase Compensation Capacitor

3

6

Ω

25

Ω

25

Ω

1K

4

Ω

1K

Current Detector

Start/Stop

Ω

100K

9

Ω

5K

10

Ω

50K

Ω

25

Ω

30K

6

FAN8727

Equivalent Circuits ^(Continued)

3-Phase Rotational Direction Output

Short Brake

Ω

10K

11

Ω

25

12

Ω

25

1k

Ω

20k

3-Phase Output

OP-AMP Input

Ω

2K

Ω

15K

14

15

16

17

18

Ω

25

1K

Ω

2K

OP-AMP Ouput

BTL Drive Input

22

23

24

25

18

Ω

50

25

7

FAN8727

Equivalent Circuits ^(Continued)

BTL Drive Output

BTL Drive Mute

26

27

28

37

38

39

Ω

25

50K

30K

Ω

20K

29

32

33

35

36

Ω

30K

BTL Bias Voltage

Hall Input

43

45

47

44

46

48

41

Ω

25

Ω

25

1K

Ω

25

0.5KΩ

8

FAN8727

Absolute Maximum Ratings ( Ta=25°C)

Parameter

Symbol

Value

Unit

Supply Voltage (BTL Signal)

Supply Voltage (Spindle Signal)

Supply Voltage (Motor)

V

15

7

15

V

CC1max

V

CC2max

V

Mmax

Supply Voltage (BTL Motor)

Power Dissipation

Operating Temperature Range

Storge Temperature Range

Maximum Output Current (Spindle Part)

Maximum Output Current (BTL Part)

V

15

V

MBTLmax

Pd

Topr

Tstg

OMAXS

OMAXB

3.0^note

-35 ~ +85

-55 ~ +150

1.3

W

°C

A

I

1

A

Note:

1. When mounted on 70mm × 70 mm × 1.6mm PCB (Phenolic resin material)

2. Power dissipation is reduced 24 mW/°C for using above Ta=25°C

3. Do not exceed Pd and SOA.

Pd [mW]

3,000

2,000

1,000

0

Ambient Temperature, Ta [°C]

0

25

50

75

100

125

150 175

Recommended Operating Conditions ( Ta=25°C)

Parameter

Symbol

Min.

4.5

Typ.

Max.

13.2

5.5

Unit

V

Operating Supply Voltage (BTL Signal)

Operating Supply Voltage (Spindle Signal)

Operating Supply Voltage ( Spindle Motor)

Operating Supply Voltage (BTL Motor)

V

-

CC1

CC2

V

note

V

13.2

V

M

V

MBTL

CC1

Note: The VM should be turn on before the VCC2.

9

FAN8727

Electrical Characteristics ^{(Ta=25°C, V}

=5V, V =12V)

CC2 M

Parameter

Symbol

Condition

Min.

Typ.

0.3

Max.

Unit

mA

Circuit Current 1

I

Power Save=0V

Power Save=5V

-

1

6

CC 1

Circuit Current 2

I

4.5

CC2

START/STOP

On Voltage Range

Off Voltage Range

HALL BIAS

V

L-H Circuit On

H-L Circuit Off

2.5

-

V

PSON

V

0.5

PSOFF

Hall Bias Voltage

HALL AMP

V

I

= 20mA

HB

-

1.2

1.8

V

HB

HA

Hall Bias Current

In-Phase in Voltage Range

Minimum in Level^note

TORQUE CONTROL

In Voltage Range

Offset Voltage (-)^note

Offset Voltage (+)

In Current

I

-

1

-

5

4.0

-

uA

V

HAR

1.5

60

V

INH

-

mVpp

E

-

0.5

-100

20

-

3.3

-20

100

-

V

C

E

= 2.5V

CR

-50

50

mV

uA

COFF-

COFF+

E

= 2.5V

CR

E

CIN

E = E = 2.5V

-5

-1

C

CR

In/Output Gain

G

E

= 2.5V, R = 0.5Ω

0.41

0.51

0.61

A / V

EC

CR

CS

FG

FG Output Voltage (H)

FG Output Voltage (L)

Input Voltage Range^note

OUTPUT BLOCK

Saturation Voltage (Upper TR)

Saturation Voltage (Lower TR)

Torque Limit Current

DIRECTION DETECTOR

Dir Output Voltage (H)

Dir Output Voltage (L)

SHORT BRAKE

V

I

= -10uA

= 10uA

3.0

-

V

CC

V

FGH

FG

V

0.5

4.0

FHL

Hn+, Hn- input D-range

1.5

FGR

V

I = -300mA

-

0.9

0.2

1.6

0.6

V

OH

O

V

I = 300mA

O

OL

TL

I

R

= 0.5Ω

560

700

840

mA

CS

V

I

= -10uA

= 10uA

3.0

-

V

CC

V

DIRH

FG

V

0.5

DIRL

On Voltage Range

Off Voltage Range

V

-

2.5

0

-

V

SBON

CC

V

1.0

SBOFF

Note: Guaranteed field ( No EDS / Final test )

10

FAN8727

Electrical Characteristics ^(Continued)

BTL Drive Part (Ta=25°C, V

=12V, V =12V, R =24Ω)

MBTL L

CC1

Parameter

Symbol

Condition

Min.

-

Typ.

18

-

Max.

25

Unit

mA

mV

Quiescent Circuit Current

Output Offset Voltage

I

-

CC

V

-40

40

OO

OM

Maximum Output

Amplitude Voltage

V

-

9.5

10.5

-

V

Voltage Gain

G

V =0.1Vrms, 1kHz

IN

10.5

12.0

60

1.0

-

13.5

dB

V/us

V

VC

Ripple Rejection Ratio^note

Slew Rate^note

RR

SR

V =0.1Vrms, 120kHz

IN

-

120Hz, 2Vpp

CH Mute off Voltage

CH Mute On Voltage

NORMAL OP- AMP

Input Offset Voltage

Input Bias Current

V

Pin37, 38, 39 = Variation

-

1.0

-

MOFFCH

V

2.5

-

V

MONCH

V

-

-20

-

+20

mV

nA

V

OF

I

600

B1

High Level Output Voltage

Low Level Output Voltage

Output Sink Current

Output Source Current

Open Loop Voltage Gain^note

Ripple Rejection Ratio^note

Slew Rate^note

V

11

-

OH1

V

-

0.1

V

OL1

I

10

5

25

8

-

mA

dB

V/us

dB

SINK

I

SOU1

G

f=1kHz, V = -75dB

IN

-

75

65

1

VO1

RR1

SR1

f=120Hz, V = -20dB

IN

-

f=120Hz, 2Vp-p

-

Common Mode Rejection Ratio^note

CMRR1

f=1kHz, V = -20dB

IN

-

80

Note: Guaranteed field ( No EDS / Final test )

11

FAN8727

Calculation of Gain & Torque Limit Current

VM

−

I

O

Output

Current sense

V

S

+

R

S

CS1 (Pin 9)

Current / Voltage

Convertor

Negative

Feedback loop

−

Vin

+

I

O

R1

U

V

−

Power

Transistors

+

EC

+

Driver

Gm

W

−

ECR

Absolute

Values

Commutation

Distributor

+

Vmax

−

H1

H2

H3

VM

Max. output current limiting

0.255 which is made from GM times R1 is fixed value within IC.

0.255

Gain = --------------

R_S

Vmax (see above block diagram) is setted to 350mV.

Vmax

R_SR_S

350[mV]

Itl[mA] = --------------- = -----------------------

12

FAN8727

Application Information

1. Mute Function

1) Mute Control Voltage Condition

When using the mute function, the applied control voltage condition is as follows.

MUTE ON Voltage

MUTE OFF Voltage

2.5[V] Above

Mute Function Operation

Normal Operation

OPEN or 0.5[V] Below

2) Separated Channel Mute Function

These pins are used for individual channel mute operation.

- When the mute pins (pin 37, 38 and 39) are OPEN or the voltage of the mute pins are below 0.5[V], the mute circuit is

stopped and BTL output circuits operate normally.

- When the mute pins (pin 37, 38 and 39) are above 2.5[V], the mute circuits are activated so that the BTL output circuits

will be muted.

- If the junction temperature rises above 175°C, then the thermal shutdown (TSD) circuit is activated and all the output

circuits (4-CH BTL Drivers and 3-phase BLDC Driver) are muted.

2. 4-CH Balanced Transformerless (Btl) Driver

VCC

Q1

Q2

DRIVE

AMP

DRIVE

AMP

M

27

29

33

36

26

28

X2

32

35

Q3

Q4

GND

41

Vbias

Vin

+

LEVEL

SHIFT

AMP1

−

Rextern

22 23

24 25

10k

- The voltage, Vbias, is the reference voltage given by the external bias voltage of pin 41.

- The input signals, Vin, through the pins (pin 22, 23, 24 and 25) are amplified 10K/Rextern times and then fed to the level

shift.

- The level shift produces the current due to the difference between the input signal (Vin) and the arbitrary reference

voltage (Vbias). The current produced as + ∆I and - ∆I are fed into the drive buffers.

- The drive buffer operates the power TR of the output stage according to the state of the input signal(Vin).

- The output stage is the BTL driver, and the motor (or actuator) is rotating in forward direction by operating TR Q1 and

TR Q4. On the other hand, if TR Q2 and TR Q3 are operating, the motor (or actuator) is rotating in reverse direction.

- When the input signal Vin, through the pin (pin 22, 23, 24 and 25) is below the Vbias, then the motor (actuator) is in

forward direction.

13

FAN8727

- When the input signal Vin, through the pin (pin 22, 23, 24 and 25) is above the Vbias, then the motor (actuator) is in

reverse direction.

- If you want to change the gain, then modify the external resistor's value (Rextern)

3. Torque & Output Current Control

Torque Control & Output Current Control

V

M

R

NF

+

−

V

RNF

Torque sense amp

I

O

Current sense amp

V

AMP

−

Gain

Controller

E

Driver

C

+

M

−

TSD

E

CR

- By amplifying the voltage difference between E and E from the Servo IC, the torque sense AMP produces the input

CR

C

(V

) for the current sense AMP.

- The current sense AMP produces the input for the Gain controller to allow the output current (I ) of the driver to be

AMP

O

controlled by the input voltage (V

AMP

), where the output current (I ) is detected by the sense resistor (R ) and is

NF

O

converted into V

.

RNF

- In the end, the signals of the Servo IC control the velocity of the motor by controlling the output current (I ) of the

O

driver.

- When the junction temperature rises up to about 175°C, then the output drive circuit will be shut down.

- The range of the torque control input voltage is as shown below.

V

RNF

[V]

Rotation

Reverse

Forward

Ec < E

Ec > E

Forward rotation

CR

Stop after detecting

reverse rotation

CR

Ecoff−

Ecoff+

3 mV

0

E

-E [V]

C

CR

The input range (E ) of the Torque Sense AMP is 0.5V ~ 3.3V

C

14

FAN8727

4. Power Save Function

Bias block

V

CC

100k

Q1

10

30KΩ

Start

Stop

12KΩ

- This function block operates the power saving function.

- The power save circuit is activated by operating TR Q1.

- When the SS (Start/Stop) pin 10 is high (V ), the TR Q1 is turned on so that the bias circuit is enabled. On the other

CC

hand, when the SS (Start/Stop) pin 10 is Open or Low (GND), the TR Q1 is turned off so that the bias circuit is disabled.

- The power save operation controlled by SS (pin 10) input conditions is as follows;

Pin#10

HIGH

FAN8727

START

STOP

OPEN/LOW

5. Short Brake Function

V

M

MOTOR

OFF

Drive logic

V

CC

14

12

15

1KΩ

ON

16

Q1

ON

OFF

80KΩ

When the pick-up part moves from the inner to the outer spindle of the MD, the brake function of the reverse voltage is com-

monly employed to rate the rotational velocity of the spindle motor.However, if the spindle motor rotates rapidly, the brake

function of the reverse voltage may produce too much heat at the drive IC.

To remove these shortcomings and to enhance efficiency, the short brake function is added to FAN8727. When the short brake

function is active, all upper Power transistors are turned off and the lower Power transistors turned on, so as to reduce the rota-

tional velocity of the motor. The short brake operation controlled by SB (pin 12), and the inputs conditions are as follows.

Pin#12

HIGH

LOW

SHORT BRAKE

ON

OFF

15

FAN8727

6. Thermal Shutdown (Tsd) Function

When the junction temperature rises up to about 175°C, then the output drive circuit is shut down, when the junction tempera-

ture falls off to about 160°C, the output drive circuit will be normally operated. It has the temperature hysteresis of about 15°C.

7. Rotational Direction Detecting Function

V

CC

+

H2+

DIR

R

−

H2−

Rotation

Forward

Reverse

DIR

Low

11

D

Q

E

< E

> E

C

CR

CK

High

C

+

H3+

−

D-F/F

H3−

- The forward and reverse rotations of the MD are detected by the circuit, as shown in the above Table.

- The rotational direction of the MD can be learned by the output waveforms of the hall sensor and/or the driver. Let the

three hall sensors be H1, H2 and H3 respectively. If the hall sensors turn on in the order, H1 → H2 → H3, of the reverse

rotation, the output waveforms of the hall sensors will be as shown below.

H1

H2

H3

( a)

Inversely, if the hall sensors turn on in the order, H3→ H2→ H1, of the forward rotation, the output waveforms of the hall sen-

sors will be as shown mext page.

16

FAN8727

H1

H2

H3

( b)

In the cases above, the value of H2 at the falling edges of H3 is Low in figure <a>, while High in figure <b>. The rotational

direction detector takes advantage of this phenomenon.

8. Reverse Rotation Preventing Function

E

+

C

Current

Sense

Amp

−

E

CR

H2+

+

H2−

−

D

Q

CK

H3+

+

Gain

Driver

M

Controller

−

H3−

D-F/F

- The forward and reverse rotation of the motor are detected, as shown in the table below, by the circuit shown above.

Consequently at reverse rotation, the D-F/F output Q becomes Low and cuts off the output current sense Amp, resulting

in the stoppage of the Gain controller function.

- When the MD is rotating in forward direction, E >E is sometimes controlled to retard and/or stop the MD. As the

CR

C

controlling time of E >E gets longer, MD slows down, stops, and then rotates in the reverse direction. To prevent the

CR

C

MD from rotating in the reverse direction, a reverse rotation resistant function is required. Its operational principles are

discussed below.

Reverse Rotation Preventer

Rotation

H2

H3

D-F/F

E <E

E >E

C CR

C

CR

Forward

Reverse

H

L

H → L

H

L

Forward

-

Brake and Stop

Stop

17

FAN8727

9. FG Output Function

The FG output, which detects the number of rotations of the MD, is generated by combination zero-crossing the output wave-

forms of the hall sensors. The FG output circuit is as shown below.

+

H1

−

+

H2

−

FG OUTPUT

+

H3

−

10. Hall Sensor Connection

External Hall sensors are used in series or parallel connection as shown below.

V

CC

HALL 1

HALL 2

HALL 3

HALL 1

HALL 2

HALL 3

1

VH

18

FAN8727

11. Hall Input Output Timming Chart

The 3-phase hall signal is amplified in the hall amplifiers and sent to the matrix section, where the signal is further amplified

and combined. After the signal is converted to a current in the amplitude control circuit, the current is supplied to the output

driver, which then provides a motor drive current. The phases of the hall input signal, output voltage, and output current are

shown below.

H1 +

H2 +

H3 +

A1 output current

A1 output voltage

A2 output current

A2 output voltage

A3 output current

A3 output voltage

19

FAN8727

Test Circuits 1

BTL Drive Part

10µF

12V

2.5V

42 41 40 39 38 37

48 47 46 45 44 43

V

RL4’

RL4

36

35

34

33

1

2

3

4

5

6

VH

DO4+

SW4

12V

10µF

FG

DO4−

ECR

AVM3

EC

DO3+

SW3

RL3’

RL3

VCC2

PC1

DO3− 32

31

BTLPGND2

V

FAN8727

RL2

7

8

30

29

SIGGND

VM

BTLPGND1

DO2+

SW2

9

CS1

DO2−

28

27

26

25

SS

DO1+

10

11

DIR

SB

DO1−

SW1

RL1

12

DI1

V

13

14 15 16

17

18

19

20 21

22 23 24

SERVO AMP

TRACKING

FOCUS

A

10µF

12V

10µF

BTL SVCC

SLED

12V

CONTROL TRAY

OPIN (+)

OPIN (−)

OPOUT

V

CC

V

SW5

1

SW7

1

1.2kΩ

3

SW6

2

1MΩ

V

1MΩ

10µF

3

2

V

IN3

+

V

s1

−

V

p1

IN3

V

IN1

20

FAN8727

Test Circuits 2

Spindle Motor Drive Part

H3+

H2+

H1+

H2− H1−

H3−

A

V

48

47 46 45

44 43

42 41

40 39 38

37

SW12

SW13

36

1

2

3

4

5

6

DO4+

VH

FG

DO4− 35

2.5V

34

33

32

31

ECR

EC

AVM3

DO3+

DO3−

E

C

SW14

VCC2

5V

BTLPGND2

PC1

A

FAN8727

SW15

30

29

28

27

26

25

7

8

12V

SIGGND

BTLPGND1

DO2+

VM

9

CS1

DO2−

V

SW16

10

11

12

DO1+

SS

DIR

SB

V

DO1−

SW17

DI1

IFR

SW18

13 14 15

16 17

18

19

20 21

22 23 24

VSB

SW19

SW20

21

FAN8727

Application Circuits

+5V

48 47 46 45 44 43

42

41

40 39

38 37

1

2

3

4

5

6

36

35

VH

DO4+

10K

TRAY

FG SIGNAL

MOTOR

FG

DO4−

100pF

SERVO

ECR

AVM3 34

33

TORQUE

+5V

CONTROL

EC

DO3+

DO3− 32

SLED

MOTOR

VCC2

PC1

VCC

31

BTLPGND2

0.1µF

FAN8727

30

29

28

27

7

8

9

SIGGND

VM

BTLPGND1

DO2+

12V

FOCUS

ACTUATOR

CS1

DO2−

SYSTEM

CONTROL

SS

DO1+

10

11

TRACKING

ACTUATOR

ROTATE

DIRECTION

DIR

SB

DO1− 26

25

12

SHORT

BREAK

DI1

13 14 15 16 17 18

19

20 21

VCC

22 23 24

SERVO AMP

+5V

TRACKING

FOCUS

SLED

CONTROL TRAY

22

FAN8727

23

FAN8727

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

CORPOTATION. 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.

www.fairchildsemi.com

9/6/02 0.0m 001

Stock#DSxxxxxxxx

2002 Fairchild Semiconductor Corporation


型号：	FAN8727
厂家：	FAIRCHILD SEMICONDUCTOR
描述：	Spindle + 4-CH Motor Drive IC 主轴+ 4 - CH电机驱动IC 驱动电子器件驱动程序和接口接口集成电路电机 CD
文件：	总24页 (文件大小：481K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

FAN8727 [FAIRCHILD]

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