KA3120_技术文档

PRELIMINARY

HDD PRODUCTS

KA3120

SPINDLE & VOICE COIL MOTOR ONE CHIP DRIVER

48-QFPH-1414

The KA3120 is an ASIC combination chip, which was

designed for the HDD, includes the following functions:

spindle motor drive, voice coil motor drive, retract and

power management.

To drive and control the spindle, the digital ASIC provides

the appropriate control signals (Start up, commutation,

speed control) to the KA3120. The spindle motor condition

is monitored by the FG output and the motor speed control

is accomplished via the PWMSP input. The ASIC controls

the voice coil motor current via PWMH and PWML inputs

and the power management circuit always monitors the

power supply voltages.

FEATURES

ORDERING INFORMATION

Device

Package

Operating Temperature

SPINDLE MOTOR DRIVE PART

KA3120

48-QFPH-1414

0 ~ 70°C

•

Soft switching

Spindle brake after retract

Adjustable brake delay time

2.0A max. current power driver

Low output saturation voltage: 1V typical @1.6A

PWM decoder & filter for soft switching

The digital circuit (ASIC) based start-up, commutation and motor speed control

VOICE COIL MOTOR DRIVE PART

•

Trimmed low offset current

1.2A max. current power driver

Gain selection and adjustable gain

Automatic power down retract function

Class AB linear amplifier with no dead zone

Low output saturation voltage: 0.8V typical @1.0A

Internal full bridge with VPNP (Vertical PNP) & NPN

VCM offset monitoring

Rev. B

MIC-99D001

January 1999

1

Ó 1999 Fairchild Semiconductor Corporation

PRELIMINARY

KA3120

HDD PRODUCTS

POWER MONITORING

•

Power on reset with delay

Hysteresis on both power comparators

Over temperature & over current shut down

5V and 12V power monitor threshold accuracy ±2%

PACKAGE

•

48QFPH (48 pin quad flat package heat-sink)

APPLICATION

•

Hard disk drive (HDD) products

MIC-99D001

January 1999

2

PRELIMINARY

HDD PRODUCTS

KA3120

BLOCK DIAGRAM

POR

Vreg

Power-on

Reset

Interface

FG

U

MCLK

V

3-Phase

BLDC

Spindle Motor

Driver

W

PWMSF

PWMSP

Motor

Custom

N

Digital

ASIC

VCM+

Voice

Coil

Motor

VCMOFFSET

Gainsel

VCM-

Voice Coil Motor

Driver

PWMH

PWML

Retract

Brake

MIC-99D001

January 1999

3

PRELIMINARY

KA3120

HDD PRODUCTS

PIN CONFIGURATION

TAB

48 47

46 45 44 43

42 41

40 39 38 37

PWMSF

CFSF

ADJ

1

2

3

4

5

6

N

36

35

34

33

32

31

SUBGND

V

SENSE5

V_DD

PCS

W

FG

SUBGND

KA3120

TAB

7

8

VREF

MCLK

30

29

28

27

26

25

ERROUT

V_DD

VCMOFF

9

ERRIN

10

11

12

POR

VCM+

PGND

CDLY

GAINSEL

SENSEOUT

13 14

15 16 17 18

19 20

21 22 23 24

TAB

MIC-99D001

January 1999

4

PRELIMINARY

HDD PRODUCTS

KA3120

PIN DESCRIPTION

Pin No.

1

Symbol

PWMSF

CFSF

I/O

I

Description

PWM input for spindle soft switching

2

-

Capacitor for spindle PWM soft switching filter

Reference voltage adjustable

Adjustable threshold voltage to 5V

5V power supply

3

ADJ

-

4

SENSE5

VDD

I

5

-

6

FG

O

I

Frequency generation to spindle speed

Voltage reference output for ASIC power

Clock from ASIC for switching

VCM output offset monitoring pin

Power On Reset

7

VREF

8

MCLK

VCMOFF

POR

9

O

-

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

CDLY

Delay capacitor for power on reset

VCM Amplifier gain selection

PWM signal input (MSB)

PWM signal input (LSB)

Filter capacitor for VCM PWM control

Delay capacitor for retract

12V power line

GAINSEL

PWMH

PWML

CFVCM

CRET

I

-

V

-

CC

FILOUT

SENSE

CRET2

PVCC

O

I

VCM PWM output

VCM current sense input

Power for VCM retract

-

12V power line for VCM output

VCM negative output

VCM(- )

SUBGND

RRET

-

Ground

I

Adjustable maximum retract current

VCM current sense Amplifier output

Ground

SENSEOUT

PGND

O

-

VCM(+)

ERRIN

-

VCM positive output

I

VCM error Amplifier negative input

5V power supply

V

-

DD

ERROUT

SUBGND

W

O

-

VCM error Amplifier output

Ground

O

Spindle motor W phase output

MIC-99D001

January 1999

5

PRELIMINARY

KA3120

HDD PRODUCTS

PIN DESCRIPTION (Continued)

Pin No.

33

Symbol

PCS

I/O

O

-

Description

Spindle soutput current sensing

Spindle motor V phase output

Ground

34

V

35

SUBGND

N

36

I

Spindle motor neutral point

Spindle motor U phase output

37

U

O

-

38

CCOMP

BRAKE

CBRAKE

PVCC

SENSE12

GND

Spindle output control compensation

Dynamic brake

39

O

-

40

Back-EMF charging capacitor for brake power

12V power line for spindle

41

-

42

I

Adjustable for threshold voltage to 12V

Ground

43

-

44

CNTL1

CNTL2

CNTL3

PWMSP

CFSP

I

Control input for spindle and brake

Control input for start-up clock and soft switching

Control input for VCM Amplifier & retract

PWM input for spindle speed control

Filter capacitor for spindle PWM control

45

I

46

I

47

I

48

-

MIC-99D001

January 1999

6

PRELIMINARY

HDD PRODUCTS

KA3120

EQUIVALENT CIRCUITS

PWM decoder filter input

PWM decoder filter Capacitor

V_DD

+

-

22W

#1, #47

+

#2, #48

-

100m

Internal 2.5V

Internal switch

Regulator part

SENSE input

V_DD

Internal 1.3V

27W

+

#3

#7

-

V_DD

27W

#4

FG output

MCLK input

V_DD

50k

27W

50k

27W

#6

#8

50k

MIC-99D001

January 1999

7

PRELIMINARY

KA3120

HDD PRODUCTS

EQUIVALENT CIRCUITS (Continued)

VCM offset compensation output

Power on reset part

V_DD

27W

V_DD

#11

#10

20k

27W

V_DD

15m

#9

50k

27W

+

Internal

Switch

-

Internal

2.5V

VCM gain selection input

VCM PWM high input

V_DD

27W

10k

27W

#12

#13

10k

500m

10k

Internal switch

VCM PWM low input

VCM PWM filter Capacitor

V_DD

+

-

V_CC, 12V

+

27W

#14

-

+

#15

-

15.6m

4k

Internal switch

Internal 4V

MIC-99D001

January 1999

8

PRELIMINARY

HDD PRODUCTS

KA3120

EQUIVALENT CIRCUITS (Continued)

Filtered VCM PWM command output

VCM current sense input

V_DD

V_CC

+

Internal

DEC OUT

#18

-

#19

Capacitor for retract power

Max. retract current set input

U

V

W

V_CC

30W

V_CC

27W

20k

#20

#24

Retract

Block

Spindle motor output compensation Capacitor

Spindle motor output and Back EMP sensing part

V_CC

V_DD

V_CC

#32, 34, 37

V_CC

60W

#38

#33

Retract

Block

V_CC

60W

-

#36

+

-

Internal 4.2V

MIC-99D001

January 1999

9

PRELIMINARY

KA3120

HDD PRODUCTS

EQUIVALENT CIRCUITS (Continued)

Dynamic break part

CNTL1, 2, 3 input

V_CC

V_DD

U

40W

2k

V_DD

#40

27W

#44, #45, #46

27W

#39

VCM output and control part

Sense12 input

Internal

1/2 V_CC

V_CC

#27

-

V_CC

+

#30

Internal

4V

V_CC

+

60W

-

60W

#42

-

#22

#19

#28

V_CC

-

#25

+

Internal

4V

MIC-99D001

January 1999

10

PRELIMINARY

HDD PRODUCTS

KA3120

ABSOLUTE MAXIMUM RATING (Ta=25°C)

Characteristics

Maximum signal block supply voltage for 5V line

Maximum signal block supply voltage for 12V line

Maximum power block supply voltage for 12V line

Maximum output current

Symbol

Value

6

Unit

V

DDMAX

CCMAX

15

2

V

PV

V

CCMAX

OMAX

I

A

note

Power dissipation

P

3.0

W

°C

D

Storage temperature

T

- 55 ~ 125

150

STG

Maximum junction temperature

Operating ambient temperature

T

JMAX

T

0 ~ 70

A

NOTE:

1. When mounted on 50mm ´ 50mm ´ 1mm PCB (Phenolic resin material)

2. Power dissipation is reduced 16mV / °C for using above Ta=25°C.

3. Do not exceed Pd and SOA.

Pd[mW]

3,000

2,000

1,000

0

25

50

75

100

125

150

175

Ambient temperature, Ta [°C]

RECOMMENDED OPERATING CONDITIONS

Characteristics

Supply voltage

Supply voltage in logic part

Symbol

, PV

Min.

10.8

4.5

Typ.

12.0

5.0

Max.

Unit

V

13.2

5.5

CC

CC2

V

DD

MIC-99D001

January 1999

11

PRELIMINARY

KA3120

HDD PRODUCTS

ELECTRICAL CHARACTERISTICS

(Ta=25°C, unless otherwise specified)

Characteristic

SUPPLY CURRENT

Symbol

Test conditions

Min. Typ. Max.

Unit

5V line supply current 1

I

CNTL1=0V

40

15

4

50

20

7

60

25

15

50

15

mA

DD1

DD2

DD3

DD4

CC1

CC2

CC3

CC4

5V line supply current 2

-

CNTL1=CNTL3=5V

CNTL3=0V

5V line supply current 3

5V line supply current 4

12V line supply current 1

CNTL1=0V

12V line supply current 2

-

4

7

12V line supply current 3

CNTL1=CNTL3=5V

CNTL3=0V

10

4

30

7

12V line supply current 4

POWER MONITOR

Threshold voltage1 level for 12V

Threshold voltage2 level for 12V

Hysteresis on 12V comparator

Adjustable pin voltage for 12V

Threshold voltage level1 for 5V

Threshold voltage level2 for 5V

Hysteresis on 5V comparator

Adjustable pin voltage for 5V

POWER ON RESET GENERATOR

Charging current for POR Capacitor

V

=Sweep, V =5V

9.1

8.9

100

3.0

3.9

3.8

50

9.4

9.2

200

3.2

4.1

4.0

100

3.0

9.8

9.6

V

TH12

CC

DD

V

=Sweep, V =5V

DD

TH12b

V

=Sweep, V =5V

300

3.4

mV

V

HYS12

DD

V12

=12V, V =5V

DD

V

=12V, V =Sweep

4.4

V

TH5

DD

V

=12V, V =Sweep

4.3

V

TH5b

DD

V

=12V, V =Sweep

150

3.25

mV

V

HYS5

DD

V5

=12V, V =5V

2.85

DD

I

V

=12V, V =5V

- 17.0 - 14.0 - 10.0

mA

V

CPOR

CC

DD

POR threshold voltage

V

CDLY=Sweep

2.3

4.5

0

2.5

-

2.7

THPOR

Output high voltage

V

=12V, V =5V

V

DD

V

POH

CC

DD

Output low voltage

V

=12V, V =5V

-

0.5

V

POL

DD

Power on reset delay

Td

C

=220nF

DLY

-

40

-

ms

POR

CONTROL INPUT

Logic control input 1 MED voltage

Logic control input 1 MED current

Logic control input 1 HIGH voltage

Logic control input 1 HIGH current

Logic control input 1 LOW voltage

Logic control input 1 LOW current

V

I

CNTL1=2.5V

CNTL1=Sweep

CNTL=5V

2.3

- 5

2.5

0

2.7

5

V

mA

V

CTL10

CTL1

V

3.8

60

4.2

80

4.6

100

1.2

-60

CTL1H

I

mA

V

CNTL1=Sweep

CNTL1=0V

0.5

-100

0.8

-80

CTL1L

I

mA

LOGIC CONTROL INPUT2 & 3 SPEC’S ARE EQUAL TO LOGIC CONTROL INPUT1

MIC-99D001

January 1999

12

PRELIMINARY

HDD PRODUCTS

KA3120

ELECTRICAL CHARACTERISTICS (Continued)

(Ta=25°C, unless otherwise specified)

Characteristic

START-UP HOLD CHECK

Start-up hold check1

Symbol

Test conditions

Min. Typ. Max.

Unit

SHM1

SHM2

-

0

0.2

0.5

V

Start-up hold check2

START-UP MODE CHECK

Start-up mode check1

Start-up mode check2

RUNNING MODE CHECK

BEMF threshold voltage

FG output high voltage

FG output low voltage

Running mode check1

Running mode check2

SPINDLE FG GENERATION

FG frequency

STM1

STM2

-

0

0.2

0.5

V

-

65

4.5

0

80

4.8

0.2

100

95

5.0

0.5

110

mV

V

BTH

-

FGH

V

FGL

RM1

RM2

U=V=W=5V, N=100Hz

90

Hz

FG

U,V,W=120° shift pulse(1KHz)

2.9

45

3

3.1

55

kHz

%

FG duty

D

50

TFG

SPINDLE PWM CONTROL

PWM high level input voltage

PWM low level input voltage

High input current at PWMSP

CFSP voltage2(100% duty of PWMSP)

V

-

3.0

-

V

SPMH

V

-

2.0

125

1.9

- 85

3.5

1.8

2.6

SPML

PSP1

I

PWMSP=100% duty

PWMSP=0% duty

-

85

1.4

105

1.7

mA

V

SP2

Low input current at PWMSP

I

- 125 - 105

mA

V

PSP2

CFSP voltage1(0% duty of PWMSP)

V

3.1

1.5

2.4

3.3

1.6

2.5

SP1

CFSP voltage amplitude

CFSP voltage3 (50% of PWMSP)

CFSP charging current

V

SPD

V

PWMSP=50% duty

PWMSP=0%, CFSP=2.5V

SPMSP=100%, CFSP=2.5V

V

SP3

I

- 180 - 150 - 130

130 150 180

mA

CFSP1

CFSP2

CFSP discharge current

MIC-99D001

January 1999

13

PRELIMINARY

KA3120

HDD PRODUCTS

ELECTRICAL CHARACTERISTICS (Continued)

(Ta=25°C, unless otherwise specified)

Characteristic

Symbol

Test conditions

Min. Typ. Max.

Unit

SPINDLE PWM SOFT SWITCHING

PWM high level input voltage

PWM low level input voltage

High input current at PWMSF

CFSF voltage2(100% duty of PWMSF)

V

-

3.0

-

V

SFMH

V

-

2.0

SFML

PFP1

I

PWMSF=100% duty

PWMSF=0% duty

-

85

100

2.75

125

2.85

- 85

2.35

550

2.6

mA

V

2.65

SF2

Low input current at PWMSF

CFSF voltage1(0% duty of PWMSF)

CFSF voltage amplitude

CFSF voltage3 (50% of PWMSF)

CFSF charging current

CFSF discharge current

BRAKE

I

- 125 - 100

mA

V

PSF2

V

2.15

450

2.4

2.25

500

2.5

SF1

V

mV

V

SFD

V

PWMSF=50% duty

PWMSF=0%, CFSP=2.5V

SPMSF=100%, CFSP=2.5V

SF3

I

- 110

90

- 90

110

- 70

130

mA

CFSF1

CFSF2

CBrake output voltage

V

-

11.0

11.3

11.5

-

V

BC

BH

Brake output high voltage

Brake output low voltage

SPINDLE OUTPUT

(Test only)

-

V

DD

V

-

0

0.2

0.5

BL

U saturation voltage_upper5

V

R ,R ,R =5W

0.2

0.3

0.5

V

SU5U

SU5V

SU5W

U

V

W

V saturation voltage_upper5

W saturation voltage_upper5

U saturation voltage_lower5

V saturation voltage_lower5

W saturation voltage_lower5

R ,R ,R =5W

U V W

V

R ,R ,R =5W

U V W

V

R ,R ,R =5W

U V W

SV5L

SU5L

V

R ,R ,R =5W

U V W

V

R ,R ,R =5W

U V W

U output frequency

V output frequency

W output frequency

F

CNTL2=12KHz

0.9

1

1.1

KHz

U

V

F

W

MIC-99D001

January 1999

14

PRELIMINARY

HDD PRODUCTS

KA3120

ELECTRICAL CHARACTERISTICS (Continued)

(Ta=25°C, unless otherwise specified)

Characteristic

SPINDLE OUTPUT

Symbol

Test conditions

Min. Typ. Max.

Unit

U phase high duration time

U phase middle duration time

V phase high duration time

V phase middle duration time

W phase high duration time

W phase middle duration time

Leakage current U upper

Leakage current V upper

Leakage current W upper

Leakage current U lower

Leakage current V lower

Leakage current W lower

U sourcing current 0.2V

T

CNTL2=12KHz

300

600

300

600

300

600

- 1

333

666

333

666

333

666

0

360

720

360

720

360

720

1

ms

UH

T

CNTL2=12KHz

UM

T

ms

VH

VM

WH

WM

ms

T

ms

T

ms

I

-

mA

A/V

ULQU

VLQU

- 1

0

1

I

- 1

0

1

WLQU

I

- 1

0

1

ULQL

VLQL

WLQL

I

- 1

0

1

I

- 1

0

1

I

3.0

4.0

0.9

5.0

1.0

OU02

OV02

OW02

V sourcing current 0.2V

I

W sourcing current 0.2V

Transconductance gain U upper

I

GM

PWMSP=sweep, R ,R ,R =5W 0.8

U V W

UH

UL

VH

Transconductance gain U lower

Transconductance gain V upper

Transconductance gain V lower

Transconductance gain W upper

Transconductance gain W lower

PWMSP=sweep, R ,R ,R =5W 0.8

0.9

0

1.0

20

A/V

U

V

W

PWMSP=sweep, R ,R ,R =5W 0.8

U

V

W

GM

PWMSP=sweep, R ,R ,R =5W 0.8

U V W

VL

WH

WL

GM

PWMSP=sweep, R ,R ,R =5W 0.8

U V W

PWMSP=sweep, R ,R ,R =5W 0.8

U

V

W

CCOMP charging current1

CCOMP charging current2

CCOMP charging current3

I

PWMSP=0%

PWMSP=50%

PWMSP=100%

- 20

mA

COMP1

COMP2

COMP3

- 200 - 250 - 300

- 400 - 500 - 600

MIC-99D001

January 1999

15

PRELIMINARY

KA3120

HDD PRODUCTS

ELECTRICAL CHARACTERISTICS (Continued)

(Ta=25°C, unless otherwise specified)

Characteristic

COMUTATION CONTROL

U stair high

Symbol

Test conditions

Min. Typ. Max.

Unit

V

-

2.85

2.35

1.85

0.9

3.0

2.5

2.0

1.0

3.0

2.5

2.0

1.0

3.0

2.5

2.0

1.0

2.75

2.25

3.0

3.15

2.65

2.15

1.1

V

USTH

U stair middle

USTM

U stair low

V

USTL

U stair frequency

V stair high

F

KHz

V

UST

V

2.85

2.35

1.85

0.9

3.15

2.65

2.15

1.1

VSTH

VSTM

V stair middle

V

V stair low

V

VSTL

V stair frequency

W stair high

F

KHz

V

VST

V

2.85

2.35

1.85

0.9

3.15

2.65

2.15

1.1

WSTH

WSTM

W stair middle

V

W stair low

V

WSTL

W stair frequency

Com high

F

KHz

V

WST

V

2.6

2.9

COMH

Com low

V

2.1

2.4

V

COML

Com frequency

F

2.8

3.2

KHz

COM

COMUTATION CONTROL SOFT

U stair frequency_soft

V stair frequency_soft

W stair frequency_soft

Com frequency_soft

Com high voltage_soft1

Com low voltage_soft1

Com high voltage_soft2

Com low voltage_soft2

REGULATOR

F

-

0.9

1.0

1.1

KHz

V

USTSF

VSTSF

WSTSF

F

0.9

1.0

1.1

F

2.9

3

3.1

CSF

V

2.65

2.15

2.65

2.15

2.75

2.25

2.75

2.25

2.85

2.35

2.85

2.35

CHSF1

V

CLSF1

CHSF1

V

CLSF1

VDD=5V,R3a=15KW,R3b=10KW

VDD=sweep

Adjustable PIN voltage

Regulator output voltage

Regulator line regulation

Regulator load regulation

V

1.2

3.1

0

1.3

3.3

0.5

1.4

3.5

1.0

V

ADJ

REG

LINE

V

R

%

R

VDD=5V

0

LOAD

MIC-99D001

January 1999

16

PRELIMINARY

HDD PRODUCTS

KA3120

ELECTRICAL CHARACTERISTICS (Continued)

(Ta=25°C, unless otherwise specified)

Characteristic

SPINDLE MCLOCK

Symbol

Test conditions

Min. Typ. Max.

Unit

High threshold voltage

Low threshold voltage

High input current

V

-

2.0

-

1.4

25

0

-

V

MH

V

0.8

35

10

ML

I

15

- 10

mA

MH

High input current

I

ML

VCM PWM CONTROL

High PWMH input current

Low PWMH input current

High PWML input current

Low PWML input current

PWMH high level input voltage

PWMH low level input voltage

PWML high level input voltage

PWML low level input voltage

CFVCM voltage1

I

PWMH=100%

100

113

130

mA

V

PWMH1

PWMH=0%

PWML=100%

PWML=0%

- 130 - 113 - 100

100 113 130

- 130 - 113 - 100

PWMH2

I

PWML1

I

PWM2

V

-

3.0

-

2.0

-

PWMH1

PWMH2

-

V

3.0

V

PWML1

V

- 130 - 113 - 100

V

PWM2

CFVC1

CFVC2

CFVC3

CFVC4

CFVC5

CFVC6

CFVC7

CFVC8

CFVC9

V

PWMH=100%,PWML=100% 5.90

6.06

6.00

5.94

4.06

4.00

3.94

2.06

2.00

1.94

32

6.30

6.20

6.10

4.30

4.20

4.10

2.40

2.30

2.20

34

V

CFVCM voltage2

PWMH=100%,PWML=50%

PWMH=100%,PWML=0%

PWMH=50%,PWML=100%

PWMH=50%,PWML=50%

PWMH=50%,PWML=0%

PWMH=0%,PWML=100%

PWMH=0%,PWML=50%

PWMH=0%,PWML=0%

-

5.80

5.70

3.90

3.80

3.70

1.90

1.80

1.70

30

V

CFVCM voltage3

V

CFVCM voltage4

V

CFVCM voltage5

V

CFVCM voltage6

V

CFVCM voltage7

V

CFVCM voltage8

V

CFVCM voltage9

V

PWM current ratio (VCM)

PWMH current variation

PWML current variation

VCM PWM FILTER

R

PWM

VPWM

I

-

0.8

1.0

1.2

mA

-

27

32.3

36

mA

Measure at 500HZ,

CFVCM=10nF

Maximum phase shift

DF

-

2

deg

Filter cut-off frequency

F

-

100

70

-

mA

CO

Filter attenuation at 1MHz

a

dB

FILTER

MIC-99D001

January 1999

17

PRELIMINARY

KA3120

HDD PRODUCTS

ELECTRICAL CHARACTERISTICS (Continued)

(Ta=25°C, unless otherwise specified)

Characteristic

VCM REFERENCE VOLTAGE

VCM reference voltage

Symbol

Test conditions

Min. Typ. Max.

Unit

V

CNTL3=5V

3.8

4.0

4.2

V

REF

VCM ERROR AMPLIFIER

Amplifier output high

V

-

10.8

0.5

10

- 15

-

11.2

0.8

-

11.5

V

EOH

Amplifier output low

V

1.2

EOL

ESC

Short circuit current

I

-

15

-

mA

mV

dB

Input offset voltage

V

0

OSE

Errot amplifier open loop gain

Unit gain bandwidth

A

80

2.3

VE

BG

-

MHz

E

VCM SENSE AMPLIFIER

Amplifier output high

V

-

10.8

0.5

10

- 15

-

11.2

0.8

-

11.5

V

SOH

Amplifier output low

V

-

1.2

SOL

SSC

Short circuit current

I

-

15

-

mA

mV

MHz

dB

Input offset voltage

V

-

0

OSE

Unit gain bandwidth

BG

-

3.4

24

6

S

Sense amplifier voltage gain1

Sense amplifier voltage gain2

VCM POWER AMPLIFIER

Power Amplifier gain1

A

Gainsel=5V

-

VS1

A

-

dB

VS2

A

-

24

11.5

0

24.6

11.8

0.2

0

25

dB

V

PO1

Power Amplifier gain2

PO2

Power Amplifier output high voltage1

Power Amplifier output high voltage2

Power Amplifier output low voltage1

Power Amplifier output low voltage2

Input offset voltage

V

12.0

0.5

15

POH1

POH2

V

POL1

POL2

0

V

- 15

-

mV

MHz

OSE

Unit gain bandwidth1

BG

2

-

P1

P2

Unit gain bandwidth2

-

2

-

VCM OFFSET COMPARATOR

Offset comparator high voltage

Offset comparator low voltage

Offset comparator offset voltage

Offset comparator hysteresis

V

-

4.5

0

4.8

0.2

0

5.0

0.5

-

V

OCH

V

OCL

V

-

mV

OCOS

V

5

10

15

OCHYS

MIC-99D001

January 1999

18

PRELIMINARY

HDD PRODUCTS

KA3120

ELECTRICAL CHARACTERISTICS (Continued)

(Ta=25°C, unless otherwise specified)

Characteristic

VCM AMPLIFIER TOTAL

VCM offset current

Symbol

Test conditions

Min. Typ. Max.

Unit

I

PWMH=PWML=50% duty

Gainsel=0V

Gainsel=5V

Rvcm=15W

-

–15

0

15

mA

A/V

V

OSVCM

VCM transconductance gain high

VCM transconductance gain low

VCM+ saturation voltage lower

VCM- saturation voltage upper

VCM+ saturation voltage upper

VCM- saturation voltage lower

VCM+ saturation voltage lower

VCM- saturation voltage upper

VCM+ saturation voltage upper

VCM- saturation voltage lower

Leakage current power Amplifier1

Leakage current power Amplifier2

RETRACT

GM

0.47

0.50

0.53

VH

GM

0.1

0.125 0.15

VL

VMS1

VMS2

VMS3

VMS4

VMS5

VMS6

VMS7

VMS8

V

-

0.5

10

-

V

-

V

-

V

-

V

-

V

-

V

-

V

I

- 10

0

mA

VCML1

VCML2

-

10

Min. operating voltage of CRET2

Source voltage

V

CRET2=Sweep

CRET2=5V

Rret=8.0KW

Rret=4.2KW

Rret=2.7KW

–

-

3.0

1.0

-

V

CRET2

V

0.8

-

1.2

0.5

60

100

155

110

1

SRC

RTSAT

RCT1

RCT2

RCT3

CRET

Sinking saturation voltage

Retract sinking current1

V

I

V

40

80

130

90

–1

48.2

91.8

143

100

0

mV

mA

Retract sinking current2

I

Retract sinking current3

I

Cret charging current1

I

Retract power Tr. leakage upper

Retract power Tr. leakage lower

THERMAL SHUT DOWN

Operating temperature

I

–

LRET1

–

0

1

TSD

-

135

20

150

30

165

40

°C

Thermal hysteresis

T

HYS

MIC-99D001

January 1999

19

PRELIMINARY

KA3120

HDD PRODUCTS

APPLICATION INFORMATION

SPINDLE MOTOR DRIVE PART

The KA3120 is a combination chip consisting of spindle motor and voice coil motor designed for HDD system.

According to the spindle conditions, the digital ASIC circuit provides optimum control signals (Start-up,

commutation, speed control, and switching mode) to the KA3120.

Detection of the back-EMF (BEMF) of the spindle motor has to be output to an external digital circuit via FG. The

MCLK and PWM signals are used to determine the commutation timing and to control the spindle speed,

respectively.

SPINDLE DRIVER

The spindle includes both low and high side drivers (H- bridge) for a three-phase sensorless brushless DC motor.

To reduce the saturation voltage, the vertical PNP Tr is used as the high side driver.

FREQUENCY GENERATION (FG)

FG stands for Frequency Generation. It is the out signal toward the digital ASIC.

Representing the current spindle speed frequency, it contains important information about the motor speed and

motor spin.

According to the FG frequency, the digital ASIC provides different motor clock signals to the motor drive IC via

MCLK and checks the motor speed to send the VCM enable signal via CNTL3.

FG frequency (Hz), motor speed (rpm) and pole number are directly related as shown below in the three phase

motor.

FG frequency = motor speed ´ pole number ´ 3 / 120

In a typical application,(8 pole motor)

FG frequency = 5400 ´ 8 ´ 3 / 120 = 1080Hz

FG frequency = Output frequency ´ 3

MIC-99D001

January 1999

20

PRELIMINARY

HDD PRODUCTS

MCLK & MASK

KA3120

The MCLK is a motor clock used as the standard clock signal for the proper commutation timing of the spindle

motor. It is supplied by the ASIC.

As shown in table 1, it has different delay times depending on the mode of the spindle speed. Table 1. MCLK &

MASK Delay Time to the Spindle Speed.

Table 1. MCLK & MASK delay time to the spindle speed

MCLK (Td)

External ASIC

FG(n-1) / 2

MASK

1ms

Switching

Start-up mode

Hard switching

Soft switching

Acceleration mode

Running mode

FG(n-1) / 4

344.45ms

FG(n-1) / 32

After the FG_Edge signal, the MCLK occurs after a half FG_Edge delay time in the acceleration mode and 1/ 32

FG_Edge delay time in the soft switching mode.

MASK

When the coil current is abruptly changed in a short time interval, a spark voltage occurs. This spark voltage mixes

with the FG output to give the wrong spindle information to the ASIC. To eliminate the spark voltage from the FG

output, the masking block is needed.

di

dt

----

Vcoil = –L

W_BEMF

V_BEMF

U_ BEMF

U_Comp

V_Comp

120°

W_Comp

FG

60°

FG_Edge

Electrically 30° Delay

MCLK

Figure 1. BEM, FG, and MCLK in the acceleration mote

MIC-99D001

January 1999

21

PRELIMINARY

KA3120

HDD PRODUCTS

Switching noise, false zero cross

FG ³ 8msec

FG

MCLK

MASK

2msec

1msec

Figure 2. MCLK vs MASK in the start-up mode

Switching noise, false zero cross

T2

FG £ 8msec, T1

FG

T1/2

T2/2

MSLK

T1/4

T2/4

MASK

Figure 3. MCLK vs MASK in the acceleration mode

MIC-99D001

January 1999

22

PRELIMINARY

HDD PRODUCTS

KA3120

PWMDEC AND SPEED CONTROL

Motor speed is measured by the ASIC via the FG output. The digital ASIC compares FG frequency with the target

motor speed and sends the speed compensation signal to the PWMSP input of the KA3120. This PWM signal is

internally filtered and is converted into DC voltage through the built-in PWM Decoder Filter. The analog output of

the filter depends on the duty of the PWM signal. The filter is a 3rd order, low-pass filter. The first pole location of

the filter is determined by the external capacitor connected to pin(48) CFSP.

0.625

R33(= 0.25 )

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

Ispindle = (D – 0.1 ) ×

Figure 4. Spindle current vs PWMSP duty variation

START-UP MODE

The BEMF is used in the sensorless BLDC motor driver to determine the rotor position. The detected rotor position

is a very important information to control the motor speed and the commutation timing.

At standstill condition, there is no BEMF voltage and no FG output. There is no information about the motor

position. However the spindle motor must be started up at standstill.

To drive the spindle at the start-up mode, the digital ASIC sends the spindle enable signal via CNTL1 and supplies

the HIGH or OPEN signal in turns via CNTL2 to be used as commutation signal of the spindle motor.

MIC-99D001

January 1999

23

PRELIMINARY

KA3120

HDD PRODUCTS

The digital ASIC continuously provides HIGH or OPEN signal until the BEMF generated is enough large to produce

the FG signal i.e. the spindle motor can be driven by the self commutation. During a fixed time, if the BEMF

generated is too small and the spindle motor is not driven by the self commutation, the ASIC resets all signals sent

and retries the spindle.

Table 2. Pin setup truth table

(1)

(2)

(3)

CNTL1

SPM driver

CNTL2

CNTL3

VCM driver

GAINSEL

Brake

S/W

Retract

SPM driver

VCM gain

High (5V)

Open (Floating)

Low (0V)

1

0

1

Hard S/W

Soft S/W

1

0

1

Normal

x

0.125

x

(4)

Start up

Hold

0.5

NOTES:

1. CNTL1: Spindle motor control

2. CNTL2: Switching mode control

3. CNTL3; VCM motor control

4. Test only

5. “1”: Enable; “0”: disable; “S/W”: switching

ACCELERATION MODE

When the BEMF detected is enough to be used as the information of motor position, the mode is changed from

start-up to acceleration. The ASIC sends the optimum commutation timing signal via MCLK according to the FG

input.

By using the BEMF, the spindle is self-commuted at acceleration and running modes. During the motor drive, the

spindle motor is commuted at that point which is electrically 30° delayed after the FG_Edge generates.

RUNNING MODE

It is called to the running mode when the spindle motor speed arrives within ± 1% of the target speed. The

switching mode, commutation delay time, MCLK delay time (Td) and masking time are changed at the running

mode.

The spindle motor speed is controlled by PWM signal within ± 0.01%.

The soft switching using the current slope of the motor may reduce noise, EMI (Electromagnetic Interference) and

spark voltage which is generated on the motor coil at the switching.

MIC-99D001

January 1999

24

PRELIMINARY

HDD PRODUCTS

KA3120

CNTL1

High

SPIN ON

Open

High

Open

Low

CNTL2

FG

+1%

Target RPM

- 1%

Rotation

Speed

Start-Up

Hard-Switching

Soft-Switching

Internal

Ready

10msec

Internal

Switching Mode

Change

VCM Enable

100msec

CNTL3

High

Open

VCM ON

High, 5V

Low, 0V

CASE1

: High gain

High, 5V

Low, 0V

CASE1

: Low gain

Figure 5. Motor start-up sequence

Duty (%)

100%

D%

FG

Frequency

F trarget

0

Figure 6. FG vs PWMSP duty variation

MIC-99D001

January 1999

25

PRELIMINARY

KA3120

HDD PRODUCTS

(1) Acceleration Mode: Hard-Switching Mode

+

0

U_BEMF

V_BEMF

-

+

0

-

+

0

W_BEMF

-

SOURCE

Iu

SINK

SOURCE

SINK

Iv

SOURCE

SINK

Iw

(2) Running Mode: Soft-Switching Mode

SOURCE

Iu

SINK

SOURCE

SINK

Iv

SOURCE

SINK

Iw

Figure 7. Acceleration and running the spindle motor

MIC-99D001

January 1999

26

PRELIMINARY

HDD PRODUCTS

KA3120

Start

High frequency

Noise

Elimination

Using filtered FG

Generate start

Counter

Counting

the FG duration

NO

Hard

Switching

NO

Saturation

= ?

MCLK = FG(n-1)/32

MASK = 344.45usec

YES

Running

Waiting 2msec

MCLK generation

MCLK = FG(n-1)/2

MASK = 344.45usec

Acceleration

MASK = 1msec

FG polarity

Check = SAME?

Retry

YES

Start up

Keep going

Waiting for FG edge

Store count

Value of the FG

Figure 8. MCLK generation flow chart

MIC-99D001

January 1999

27

PRELIMINARY

KA3120

HDD PRODUCTS

VOICE COIL MOTOR

VCM driver

The voice coil motor driver is linear, class AB, H- bridge type driver, and it includes all power transistors. After the

VCM is enabled via CNTL3, the VCM current level is controlled by two PWM signals. The input voltage level at pin

PWMH weighs, at a maximum, 32 times more than the input voltage at pin PWML. These PWM signals are filtered

by an internal second- order low-pass filter and converted into PWMOUT (DC Voltage). The filter PWMOUT

depends only on the duty factor and not on the logic level. The PWM Filter's pole is adjustable by pin CFVCM

connected to the external capacitor.

R1

Vin

VREF(4V)

-

PWMH input

PWML input

13

14

R2

Gm

C1

+

1/2 VDD

R1

+

R1

A

-

Vin

-

PWMOUT

C1

+

1/2 VDD

+

1/2 VDD

15

CFVCM

Figure 9. PWM decoder & filter schematic 2

R7

-

1/2VCC

VCM+

Sense

4V

vx

R5

27

v+

L

+

motor

RL

Vin

+

va

(PWMDEC OUT)

R5

-

+

-

R5

19

22

-

Imotor

Rsense

v-

R4

R6

VCM-

R3

-

vb

+

-

vs

+

R3

Filtout

18

Errin

Senseout

Errout

28

30 25

R18

Rexif

Cexif

R25

Figure 10. VCM driver schematic

MIC-99D001

January 1999

28

PRELIMINARY

HDD PRODUCTS

KA3120

The transconductance of VCM AMPLIFIER gain, Gm, is:

Imotor

2 ×Aerror ×Apower × R25

Gm = ----------------- = -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Vin 2 ×R18 ×Rsense ×As ×Aerror × Apower + (R18 + R25 )(Zmotor + Rsense )

Aloop R25

1 + Aloop R18 Rsense As

1

ö

æ

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

Gm =

è

ø

2 ×R18 ×As ×Aerror × Apower

Aloop = --------------------------------------------------------------------------------

(R18 + R25 )(Zmotor + Rsense )

Therefore Aloop >>1,

R25

1

Gm @ --------- ×------------------ × -----

R18 Rsense As

The transconductance (Gm) can be adjusted by selecting the external components R18, R25 and sense resister

Rsense.

if R18 = 15k, R25 = 15k, Rsense = 1

GAINSEL = 0(0V), 1 / AS = 0.5

Gm = 0.5

GAINSEL = 1(5V), 1 / AS = 0.125

Gm = 0.125

VCM current (Imotor) is:

GAINSEL = 0(0V)

1

32

R25

R18 Rsense

1

Imotor = 4 ´ (PWMH – 0.5 ) + -----(PWML – 0.5 ) ´ --------- ´ ------------------ ´ 0.43

GAINSEL = 1(5V)

1

32

R25

R18 Rsense

1

Imotor = 4 ´ (PWMH – 0.5 ) + -----(PWML – 0.5 ) ´ --------- ´ ------------------ ´ 0.11

Recommended value PWMH(100%) = 1

R18 = R25 = 15k

Rsense = 1

PWMH(50%) = 0.5

PWMH(0%) = 0

MIC-99D001

January 1999

29

PRELIMINARY

KA3120

HDD PRODUCTS

RETRACT CIRCUIT

The retract function is the operation where the VCM moves from the data zone to the parking zone when off normal

state power and abnormal power interrupt cause the spindle to stop.

Cret2

From

20

27

Spindle

+

Bandgap

Reference

´ 320

VA

_

Iref

Iretdly

Motor

Iret

Retract

Enable

19

2K

Low side

Control

16

24

Cret

Rret

Figure 11. Retract block schematic

VA = 2.0V

VA

Iref = -----------------------

Rext + 2k

Iret = Iref ´ 320

Cret ´ 2.0V

Tretdly = ------------------------------------------

Iretdly(= 100m)

MIC-99D001

January 1999

30

PRELIMINARY

HDD PRODUCTS

KA3120

POWER MANAGEMENT FEATURES

LOW POWER INTERRUPT:

The low power interrupt operation occurs when the power supply voltage (5V,12V) level drops below each

threshold voltage. The threshold voltage (Vth) and time delay (Tdly) may be adjustable by the external component

value.

Vth

I

--------

Tdly = CDLY

,(Vth = 2.5V, I = 14mA)

VDD

11

12

VDD

VCC

CDLY

I = 14mA

R7

R4

+

_

5V SENSE

4

POR

+

12V SENSE

Q15

+

_

42

R8

R5

2.5V

Figure 12. Power on reset block schematic

MIC-99D001

January 1999

31

PRELIMINARY

KA3120

HDD PRODUCTS

POWER ON RESET

The power-on reset circuit monitors the voltage level of both +5V and +12V power supplies. The power- on reset

circuit disables the spindle out block, the whole VCM block, and the digital ASIC when the power supply voltage

level drops below the reference voltage.

VDD, VCC

Vth

Vhys

T

POR

Tdly

Vbe

T

Figure 13. Power on reset function

Vhys = 4.2mV

R4 + R5

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

VDD;Vhys(5V) =

´ Vhys

R5

R7 + R8

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

VDD;Vhys(12V) =

´ Vhys

R8

Default (pin4, pin42 : not connected)

VDD, th @ 4.1V

VCC,th @ 9.4V

MIC-99D001

January 1999

32

PRELIMINARY

HDD PRODUCTS

REGULATOR

KA3120

The KA3120 includes the regulator block which supplies power of the digital ASIC. It consists of the bias block, the

band gap reference, the error amp and the external NPN power Tr. The regulator voltage can be adjusted by the

external resistor, R3a, R3b.

R3a

R3b

æ

è

ö

ø

Vreg = Vref 1 + ---------- , Vref = 1.3V

VDD

Vref

Bias

Block

Bandgap

Reference

+

VREF

7

3

-

VREG

R3a

Vadjust

R3b

Figure 14. low drop regulator schematic

if R3a = 15k, R3b = 10k

R3a

R3b

15k

ö

æ

è

ö

ø

æ

è

Vreg = Vref 1 + ---------- = 1.3 ´ 1 + -------- = 3.25V

ø

10k

MIC-99D001

January 1999

33

PRELIMINARY

KA3120

HDD PRODUCTS

STR_CLK

BEMF

DETECTION

STR_MASK

U_OUT

FG

Figure 15. Start-up mode

MCLK*2

U_OUT

FG

Figure 16. Acceleration mode 1

MIC-99D001

January 1999

34

PRELIMINARY

HDD PRODUCTS

KA3120

T1/4

2msec

T1/2

MCLK*2

T1

U_OUT

FG

Figure 17. Acceleration mode 2

U_OUT

V_OUT

W_OUT

Figure 18. Output in hard-switching mode

MIC-99D001

January 1999

35

PRELIMINARY

KA3120

HDD PRODUCTS

Switching Mode Conterting

FG

COM

Output

Figure 19. Switching mode converting

U_OUT

V_OUT

W_OUT

Figure 20. Soft-switching mode

MIC-99D001

January 1999

36

PRELIMINARY

HDD PRODUCTS

KA3120

CNTL3

Filout

Ivcm

CNTL3

Filout

Ivcm

PW MH

Filout

Ivcm

Figure 21. VCM recalibration flow

MIC-99D001

January 1999

37

PRELIMINARY

KA3120

HDD PRODUCTS

POR

CBREAK

Vout

Iret

Figure 22. Retract & break at power off

MIC-99D001

January 1999

38

PRELIMINARY

HDD PRODUCTS

KA3120

TYPICAL APPLICATION CIRCUIT

5V

R3a

3

R3b

Q1

7

GND

C11

4

42

11

43

ADJ

CDLY

VREF

SENSE15

SENSE12

Power

Bandgap

Reference

& Bias

POR

FG

N

10

6

On

36

39

Reset

U

V

Brake

AMP

W

V

M39a

W

M39b

Zero

Cross

Detector

Brake

Cbrake

FG

Generator

C39

C40

Brake

40

41

MCLK

PVCC

8

CNTL1

CNTL2

CNTL3

U

44

45

37

34

32

33

3 State

Input

Control

Commutation

&

V

Spindle Motor

Control

3-phase

46

38

Output

Driver

C38

W

CCOMP

R33

PCS

PWM

Decoder

Filter

PWMSP

C48

47

48

1

AMP

Vlimit

12V

D20

SUBGND

31

20

PWMSF

PWM

Decoder

Filter

Thermal

Shutdown

U

V

W

C2

CRET2

R24

2

Retract

C20

24

Retract

VCM enable

FILOUT

RRET

PWMH

PWML

C15

13

14

PWM

Decoder

Filter

VCM+

VCM-

16

21

22

VCMREF4V

CRET

PVCC

C16

15

12

ERR_Amplifier

AMP

VCM-

AMP

GAINSEL

SENSE

Amplifier

Rsense

VCM-

19

AMP

SENSE

VCM+

29

9

VDD

VCM

SENSE

Amplifier

27

26

SENSE

VCMOFF

PGND

ERROUT

30

ERRIN

28

SENSEOUT

25

23, 35

GND

18

R25

17

5

VCC

VDD

R18

C30

R30

MIC-99D001

January 1999

39

PRELIMINARY

KA3120

HDD PRODUCTS

APPLICATION CIRCUIT

R42a

R42b

R4b

12V

5V

C11

R4a

5, 29

17

11

CDLY

4

42

VREG

R3b

7

3

VCC

VDD

10

6

POR

R3a

VREF

FG

8

MCLK

CNTL1

CNTL2

CNTL3

ADJ

44

45

46

v

U

2003

12V

39

40

BRAKE

M39b

PWMSP

PWMSOFT

PWMH

PWML

M39a

47

1

C39

C40

CBRAKE

13

41

36

PVCC1

14

N

U

C48

48

CFSP

CFSF

37

34

2

C2

Digital

Custom

ASIC

KA3120

C15

15

U

CFVCM

V

W

VCMOFF

9

GAINSEL 12

32

38

33

W

C38

VCM-

CCOMP

22

Rsense

PCS

12V

R33

SENSE

21

19

PVCC2

R22

D20

C20

C27

VCM

20

24

CRET2

RRET

GND

27

18

VCM+

R24

FILOUT

ERRIN

28

25

30

23, 26, 31, 35

R25

R18

: option

R30

C30

MIC-99D001

January 1999

40

PRELIMINARY

HDD PRODUCTS

KA3120

COMPONENT VALUE

Part No.

R18

Value

15k

Type

1/4W

Part No.

C2

Value

10n

47n

10n

1m

Type

Part No.

Q1

Value

Type

Ceramic

KSH29

D-PAK

R24

2.2k

C11

M39a

M39b

D20

SSD2003

RB4110

8SOP

R22

Option

15k

C15

R25

C16

Schottky

Diode

R30

Rsense

R33

1k

1/4W

1W

C20

C27

C30

C38

C40

C48

C39

224n

1m

Ceramic

-

1

0.25

1W

1.2n

150n

220n

10n

R4A

Option

1/4W

R4B

R42A

R42B

Option

MIC-99D001

January 1999

41

PRELIMINARY

KA3120

HDD PRODUCTS

PACKAGE DIMENSION

MIC-99D001

January 1999

42

TRADEMARKS

The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is

not intended to be an exhaustive list of all such trademarks.

ACEx™

CoolFET™

ISOPLANAR™

MICROWIRE™

POP™

PowerTrench™

QS™

CROSSVOLT™

E²CMOS^TM

FACT™

FACT Quiet Series™

Quiet Series™

SuperSOT™-3

SuperSOT™-6

SuperSOT™-8

TinyLogic™

FAST^®

FASTr™

GTO™

HiSeC™

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 FAIRCHILD SEMICONDUCTOR CORPORATION.

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, or (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 significant injury to the

user.

2. A critical component is 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.

PRODUCT STATUS DEFINITIONS

Definition of Terms

Datasheet Identification

Product Status

Definition

Advance Information

Formative or

In Design

This datasheet contains the design specifications for

product development. Specifications may change in

any manner without notice.

Preliminary

First Production

This datasheet contains preliminary data, and

supplementary data will be published at a later date.

Fairchild Semiconductor reserves the right to make

changes at any time without notice in order to improve

design.

No Identification Needed

Obsolete

Full Production

This datasheet contains final specifications. Fairchild

Semiconductor reserves the right to make changes at

any time without notice in order to improve design.

Not In Production

This datasheet contains specifications on a product

that has been discontinued by Fairchild semiconductor.

The datasheet is printed for reference information only.


型号：	KA3120
厂家：	FAIRCHILD SEMICONDUCTOR
描述：	SPINDLE & VOICE COIL MOTOR ONE CHIP DRIVER 主轴和音圈电机ONE芯片驱动电机驱动
文件：	总43页 (文件大小：778K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

KA3120 [FAIRCHILD]

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