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Rev. 1.0.2

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

Ordering Information

Device

Package

Operating Temperature

FAN8727 48-QFPH-1414

-35

C ~ +85

FAN8727

Spindle + 4-CH Motor Drive IC

FAN8727

Pin Assignments

FAN8727

ECR

VCC2

PC1

SIGGND

CS1

DIR

DO4 +

DO4

AVM3

DO3 +

DO3

BTLPGND2

BTLPGND1

DO2 +

DO2

DO1 +

DO1

DI1

H3 +

H2 +

H1 +

BTLS

NGD

MUTE12

MUTE3

MUTE4

PWRGND

I
N

OPOUT

VCC

1
2

FAN8727

Pin Definitions

Pin Number

Pin Name

I/O

Pin Function Description

Hall Bias

FG Signal Output

ECR

Torque Control Reference

Torque Control Signal

VCC2

Supply Voltage

PC1

Phase Compensation Capacitor

SIGGND

Signal Ground

Motor Supply Voltage

CS1

Current Sensor

S/S

Start/stop

DIR

3-Phase Rotational Direction Output

Short Brake

PWRGND

Power Ground

3-Phase Output 3

3-Phase Output 2

3-Phase Output 1

OPIN+

OP-AMP Input (+)

OPIN-

OP-AMP Input (-)

OPOUT

OP-AMP Output

VCC1

Supply Voltage

AVM12

BTL CH1, 2 Motor Supply Voltage

DI4

BTL Drive Input 4

DI3

BTL Drive Input 3

DI2

BTL Drive Input 2

DI1

BTL Drive Input 1

DO1-

BTL Drive 1 Output (-)

DO1+

BTL Drive 1 Output (+)

DO2-

BTL Drive 2 Output (-)

DO2+

BTL Drive 2 Output (+)

BTLPGND1

BTL Power Ground 1

BTLPGND2

BTL Power Ground 2

DO3-

BTL Drive 3 Output (-)

DO3+

BTL Drive 3 Output (+)

FAN8727

Pin Definitions

(Continued)

Pin Number

Pin Name

I/O

Pin Function Description

AVM3

BTL CH3 Motor Supply Voltage

DO4-

BTL Drive 4 Output (-)

DO4+

BTL Drive 4 Output (+)

MUTE4

BTL Drive Mute CH4

MUTE3

BTL Drive Mute CH3

MUTE12

BTL Drive Mute CH1, 2

AVM4

BTL CH4 Motor Supply Voltage

BIAS

BTL Bias Voltage

BTLSGND

BTL Drive Signal Ground

H1-

Hall1(-) Input

H1+

Hall1(+) Input

H2-

Hall2(-) Input

H2+

Hall2(+) Input

H3-

Hall3(-) Input

H3+

Hall3(+) Input

FAN8727

Internal Block Diagram

ECR

VCC2

PC1

SIGGND

CS1

DIR

OPIN-

PWRGND

OPIN+

VCC1

OPOUT

DI2

DI4

AVM12

DI3

DO4-

DO3+

DO3-

DO4+

BTLPGND2

AVM3

BTLPGND1

DO2+

DO1-

DO2-

DO1+

DI1

H1-

H1+

H2+

H2-

H3+

H3-

MUTE4

AVM4

MUTE12

BTLSGND

BIAS

MUTE3

Hall Amp

MUTE12

MUTE3

MUTE4

Distributor

Logic

Detection

Reverse
Rotation

Short
Brake

FG
Generator

Hall
Bias

AVM4

AVM3

AVM12

TSD

Absolute Values

Current
Sense Amp

Output
Current Limit

CS1

FAN8727

Absolute Maximum Ratings ( Ta=25

°
°
°
°

Note:
1.

When mounted on 70mm

70 mm

1.6mm PCB (Phenolic resin material)

Power dissipation is reduced 24 mW/

C for using above Ta=25

Do not exceed Pd and SOA.

Recommended Operating Conditions ( Ta=25

°
°
°
°

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

Parameter

Symbol

Value

Unit

Supply Voltage (BTL Signal)
Supply Voltage (Spindle Signal)
Supply Voltage (Motor)
Supply Voltage (BTL Motor)
Power Dissipation
Operating Temperature Range
Storge Temperature Range
Maximum Output Current (Spindle Part)
Maximum Output Current (BTL Part)

CC1max

CC2max

Mmax

MBTLmax

Topr

Tstg

OMAXS

OMAXB

15
15

3.0

note

-35 ~ +85

-55 ~ +150

1.3

V
V
V
V

°
°
°
°

A
A

Parameter

Symbol

Min.

Typ.

Max.

Unit

Operating Supply Voltage (BTL Signal)

CC1

4.5

13.2

Operating Supply Voltage (Spindle Signal)

CC2

4.5

5.5

Operating Supply Voltage ( Spindle Motor)

note

4.5

13.2

Operating Supply Voltage (BTL Motor)

MBTL

4.5

CC1

175

150

125

100

1,000

2,000

3,000

Pd [mW]

Ambient Temperature, Ta [

FAN8727

Electrical Characteristics

(Ta=25

C, V

CC2

=5V, V

=12V)

Note: Guaranteed field ( No EDS / Final test )

Parameter

Symbol

Condition

Min.

Typ.

Max.

Unit

Circuit Current 1

CC 1

Power Save=0V

0.3

Circuit Current 2

CC2

Power Save=5V

4.5

START/STOP
On Voltage Range

PSON

L-H Circuit On

2.5

Off Voltage Range

PSOFF

H-L Circuit Off

0.5

HALL BIAS
Hall Bias Voltage

= 20mA

1.2

1.8

HALL AMP
Hall Bias Current

In-Phase in Voltage Range

HAR

1.5

4.0

Minimum in Level

note

INH

mVpp

TORQUE CONTROL
In Voltage Range

0.5

3.3

Offset Voltage (-)

note

COFF-

= 2.5V

-100

-50

-20

Offset Voltage (+)

COFF+

= 2.5V

100

In Current

CIN

= E

= 2.5V

-5

-1

In/Output Gain

= 2.5V, R

= 0.5

0.41

0.51

0.61

A / V

FG
FG Output Voltage (H)

FGH

= -10uA

3.0

FG Output Voltage (L)

FHL

= 10uA

0.5

Input Voltage Range

note

FGR

Hn+, Hn- input D-range

1.5

4.0

OUTPUT BLOCK
Saturation Voltage (Upper TR)

= -300mA

0.9

1.6

Saturation Voltage (Lower TR)

= 300mA

0.2

0.6

Torque Limit Current

= 0.5

560

700

840

DIRECTION DETECTOR
Dir Output Voltage (H)

DIRH

= -10uA

3.0

Dir Output Voltage (L)

DIRL

= 10uA

0.5

SHORT BRAKE
On Voltage Range

SBON

2.5

Off Voltage Range

SBOFF

1.0

FAN8727

Electrical Characteristics

(Continued)

BTL Drive Part (Ta=25

C, V

CC1

=12V, V

MBTL

=12V, R

=24

)

Note: Guaranteed field ( No EDS / Final test )

Parameter

Symbol

Condition

Min.

Typ.

Max.

Unit

Quiescent Circuit Current

Output Offset Voltage

-40

Maximum Output
Amplitude Voltage

9.5

10.5

Voltage Gain

=0.1Vrms, 1kHz

10.5

12.0

13.5

Ripple Rejection Ratio

note

=0.1Vrms, 120kHz

Slew Rate

note

120Hz, 2Vpp

1.0

V/us

CH Mute off Voltage

MOFFCH

Pin37, 38, 39 = Variation

1.0

CH Mute On Voltage

MONCH

Pin37, 38, 39 = Variation

2.5

NORMAL OP- AMP
Input Offset Voltage

-20

+20

Input Bias Current

600

High Level Output Voltage

OH1

Low Level Output Voltage

OL1

0.1

Output Sink Current

SINK

Output Source Current

SOU1

Open Loop Voltage Gain

note

VO1

f=1kHz, V

= -75dB

Ripple Rejection Ratio

note

RR1

f=120Hz, V

= -20dB

Slew Rate

note

SR1

f=120Hz, 2Vp-p

V/us

Common Mode Rejection Ratio

note

CMRR1

f=1kHz, V

= -20dB

FAN8727

Calculation of Gain & Torque Limit Current

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

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

ECR

+
+

Absolute
Values

Current / Voltage
Convertor

Vin

Driver

Vmax

Max. output current limiting

Negative
Feedback loop

CS1 (Pin 9)

Output

Current sense

Power
Transistors

Commutation
Distributor

Gain

0.255

---------------

Itl mA

[

]

Vmax

----------------

350 mV

[

]

------------------------

FAN8727

Application Information

1. Mute Function

1) Mute Control Voltage Condition

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

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

- 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.

MUTE ON Voltage

2.5[V] Above

Mute Function Operation

MUTE OFF

Voltage

OPEN or 0.5[V] Below

Normal Operation

VCC

LEVEL

SHIFT

AMP1

GND

DRIVE

AMP

DRIVE

AMP

22 23

24 25

Rextern

10k

Vbias

Vin

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

- By amplifying the voltage difference between E

and E

from the Servo IC, the torque sense AMP produces the input

AMP

) 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

controlled by the input voltage (V

AMP

), where the output current (I

) is detected by the sense resistor (R

) and is

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

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.

The input range (E

) of the Torque Sense AMP is 0.5V ~ 3.3V

Torque sense amp

Current sense amp

TSD

Gain

Controller

Driver

AMP

RNF

Forward

Ecoff+

Ecoff

Reverse

RNF

[V]

3 mV

-E

[V]

Rotation

Ec < E

Forward rotation

Ec > E

Stop after detecting
reverse rotation

FAN8727

4. Power Save Function

- 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

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;

5. Short Brake Function

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#10

FAN8727

HIGH

START

OPEN/LOW

STOP

Pin#12

SHORT BRAKE

HIGH

LOW

OFF

Start

Stop

12K

30K

100k

Bias block

MOTOR

OFF

80K

Drive logic

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

7. Rotational Direction Detecting Function

- 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

H3, of the reverse

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

Inversely, if the hall sensors turn on in the order, H3

H1, of the forward rotation, the output waveforms of the hall sen-

sors will be as shown mext page.

DIR

D-F/F

H2+

H3+

Rotation

DIR

< E

Forward

Low

> E

Reverse

High

( a)

FAN8727

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

- 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

is sometimes controlled to retard and/or stop the MD. As the

controlling time of E

gets longer, MD slows down, stops, and then rotates in the reverse direction. To prevent the

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

Rotation

D-F/F

Reverse Rotation Preventer

Forward

H H

Forward

Brake and Stop

Reverse

Stop

( b)

Current
Sense
Amp

Gain

Controller

Driver

D-F/F

H3+

H2+

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.

10. Hall Sensor Connection

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

FG OUTPUT

HALL 1

HALL 2

HALL 3

1 VH

HALL 1

HALL 2

HALL 3

1 VH

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

A3 output current

A3 output voltage

A2 output voltage

A2 output current

A1 output voltage

FAN8727

Test Circuits 1

BTL Drive Part

FAN8727

12V

2.5V

VMUTE

RL4'

RL4

RL3'

RL3

SW4

SW3

RL2

SW2

SW1

RL1

SERVO AMP

TRACKING

FOCUS

SLED

CONTROL TRAY

12V

BTL SVCC

12V

OPIN (+)

OPIN (

)

OPOUT

SW5

IN1

1.2k

SW7

SW6

IN3

ECR

VCC2

PC1

SIGGND

CS1

DIR

DO4+

DO4

AVM3

DO3+

DO3

BTLPGND2

BTLPGND1

DO2+

DO2

DO1+

DO1

DI1

H3+

H2+

H1+

BTLSGND

MUTE12

MUTE3

MUTE4

PWRGND

OPI

OPOUT

VCC1

D14

D13

D12

FAN8727

Test Circuits 2

Spindle Motor Drive Part

FAN8727

H3+ H3

H2+ H2

H1+ H1

SW12

SW13

SW14

2.5V

12V

SW15

SW16

SW17

SW18

IFR

SW19 SW20

VSB

ECR

VCC2

PC1

SIGGND

CS1

DIR

DO4+

DO4

AVM3

DO3+

DO3

BTLPGND2

BTLPGND1

DO2+

DO2

DO1+

DO1

DI1

H3+

H2+

H1+

BTL

GND

MUTE1

MUT

RGND

I
N

VCC1

D14

D13

D12

FAN8727

Application Circuits

FAN8727

HAL

L B

I
AS

VOL

AGE

+5V

S TR

ACKI

MUTE

ED MUT

TRAY

MOTOR

+5V

SLED

MOTOR

FOCUS

ACTUATOR

TRACKING

ACTUATOR

SERVO AMP

TRACKING
FOCUS
SLED

CONTROL TRAY

+5V

VCC

SHORT

BREAK

ROTATE

DIRECTION

SYSTEM

CONTROL

12V

0.1

VCC

SERVO

TORQUE

CONTROL

FG SIGNAL

ECR

VCC2

PC1

SIGGND

CS1

DIR

DO4+

DO4

AVM3

DO3+

DO3

BTLPGND2

BTLPGND1

DO2+

DO2

DO1+

DO1

DI1

H3+

H2+

H1+

LSGND

MUTE1

MUT

PWRGND

OPI

OPOUT

VCC1

1
2

D14

D13

D12

100pF

10K

FAN8727

9/6/02 0.0m 001

Stock#DSxxxxxxxx

2002 Fairchild Semiconductor Corporation

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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

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

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