Fairchild Semiconductor FAN8727 Datasheet

FAN8727

Spindle + 4-CH Motor Drive IC

www.fairchildsemi.com

Features

• Built-in Power Save Circuit

• Built-in Current Limit Circuit

• 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

• 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

Description

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.

48-QFPH-1414

Typical Applications

•Mini Disk Player

• Digital Video Disk Player

• Car Mini Disk Player

• Car Navigation System

©2002 Fairchild Semiconductor Corporation

Ordering Information

Device Package Operating Temperature

FAN8727 48-QFPH-1414 -35°C ~ +85°C

Rev. 1.0.2

FAN8727

Pin Assignments

H3 +

48 47 46 45 44 43 42 41 40 39 38 37

H3 −

H2 +

H2 −

H1 +

H1 −

BTLSNGD

BIAS

AVM4

MUTE12

MUTE3

MUTE4

VH

FG

ECR

EC

VCC2

PC1

SIGGND

VM

CS1

SS

DIR

SB

1

2

3

4

5

6

36

35

34

33

32

31

DO4 +

DO4 −

AVM3

DO3 +

DO3 −

BTLPGND2

FAN8727

7

8

9

10

11

12

30

29

28

27

26

25

BTLPGND1

DO2 +

DO2 −

DO1 +

DO1 −

DI1

13 14 15 16 17 18 19 20 21 22 23 24

A3

A2

PWRGND

A1

OPIN+

OPIN−

OPOUT

VCC1

DI4

DI3

DI2

AVM12

2

Pin Definitions

Pin Number Pin Name I/O Pin Function Description

1VHIHall Bias
2 FG O FG Signal Output
3 ECR I Torque Control Reference
4 EC I Torque Control Signal
5 VCC2 - Supply Voltage
6 PC1 - Phase Compensation Capacitor
7 SIGGND - Signal Ground
8 VM - Motor Supply Voltage

9 CS1 I Current Sensor
10 S/S I Start/stop
11 DIR O 3-Phase Rotational Direction Output
12 SB I Short Brake
13 PWRGND - Power Ground
14 A3 O 3-Phase Output 3
15 A2 O 3-Phase Output 2
16 A1 O 3-Phase Output 1
17 OPIN+ I OP-AMP Input (+)
18 OPIN- I OP-AMP Input (-)
19 OPOUT O OP-AMP Output
20 VCC1 - Supply Voltage
21 AVM12 - BTL CH1, 2 Motor Supply Voltage
22 DI4 I BTL Drive Input 4
23 DI3 I BTL Drive Input 3
24 DI2 I BTL Drive Input 2
25 DI1 I BTL Drive Input 1
26 DO1- O B TL Drive 1 Output (-)
27 DO1+ O BTL Drive 1 Output (+)
28 DO2- O B TL Drive 2 Output (-)
29 DO2+ O BTL Drive 2 Output (+)
30 BTLPGND1 - BTL Power Ground 1
31 BTLPGND2 - BTL Power Ground 2
32 DO3- O B TL Drive 3 Output (-)
33 DO3+ O BTL Drive 3 Output (+)

FAN8727

3

FAN8727

Pin Definitions

Pin Number Pin Name I/O Pin Function Description

34 AVM3 - BTL CH3 Motor Supply Voltage
35 DO4- O B TL Drive 4 Output (-)
36 DO4+ O BTL Drive 4 Output (+)
37 MUTE4 I BTL Drive Mute CH4
38 MUTE3 I BTL Drive Mute CH3
39 MUTE12 I BTL Drive Mute CH1, 2
40 AVM4 - BTL CH4 Motor Supply Voltage
41 BIAS - BTL Bias Voltage
42 BTLSGND - BTL Drive Signal Ground
43 H1- I Hall1(-) Input
44 H1+ I Hall1(+) Input
45 H2- I Hall2(-) Input
46 H2+ I Hall2(+) Input
47 H3- I Hall3(-) Input
48 H3+ I Hall3(+) Input

(Continued)

4

Internal Block Diagram

H3+

H3-

H2+

H2-

H1+

H1-

BIAS

BTLSGND

AVM4

MUTE12

MUTE3

FAN8727

MUTE4

37383940414248 47 46 45 44 43

VH

FG

ECR

EC

VCC2

PC1

SIGGND

VM

CS1

SS

DIR

SB

1

2

3

4

5

6

Absolute Values

CS1VM

7

8

9

10

11

12

Hall
Bias

FG
Generator

Current
Sense Amp

Output
Current Limit

Short
Brake

TSD

Hall Amp

Detection

Logic

Reverse
Rotation

Distributor

AVM4

AVM3

AVM12

AVM12

MUTE12

MUTE3

MUTE4

36

35

34

33

32

31

BTLPGND2

30

BTLPGND1

29

28

27

26

25

DO4+

DO4-

AVM3

DO3+

DO3-

DO2+

DO2-

DO1+

DO1-

DI1

13

PWRGND

A3

OPOUT

2019

VCC1

AVM12

22 2321

DI4

17

OPIN+

18

OPIN-

16

1514

A2

A1

DI3

24

DI2

5

FAN8727

Equivalent Circuits

Hall Bias FG Signal Output

1

Torque Control Reference & Signal Phase Compensation Capacitor

100K

Ω

10K

2

Ω

25

Ω

3

Ω

25

4

Ω

1K

Ω

1K

Current Detector Start/Stop

9

Ω

5K

10

Ω

25

25

50K

30K

6

Ω

Ω

100K

Ω

Ω

6

FAN8727

Equivalent Circuits

3-Phase Rotational Direction Output Short Brake

Ω

10K

3-Phase Output OP-AMP Input

Ω

15K

(Continued)

11

Ω

25

14
15
16

12

Ω

1k

Ω

20k

Ω

2K

17

Ω

25

Ω

1K

Ω

25

Ω

2K

18

Ω

Ω

25

1K

Ω

2K

Ω

2K

OP-AMP Ouput BTL Drive Input

22

18

23
24

Ω

25

Ω

50

25

7

FAN8727

Equivalent Circuits

BTL Drive Output BTL Drive Mute

Ω

20K

Ω

30K

BTL Bias Voltage Hall Input

41

Ω

25

0.5K

Ω

(Continued)

26
27
28
29
32
33
35
36

37
38
39

43
45
47

Ω

25

1K

Ω

25

50K
30K

Ω

Ω

44

Ω

Ω

1K

25

46

Ω

48

8