KA2822CD_技术文档

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KA2822CD

3-Phase BLDC Motor Driver

Features

Description

• 3-phase, full-wave, linear BLDC motor driver

with 2 hall sensors

• Built-in soft switching drive circuit

• 300 or 360 RPM speed control

• Snubberless

The KA2822CD is a monolithic integrated circuit suitable

for a three-phase spindle motor driver of floppy disk drive

systems. It can make index signals without an index hall sen-

sor by special rotor magnetization.

• Built-in chip enable function

• Built-in digital speed control circuit

• Built-in current limit circuit

• Index sensorless

28-SSOPH-375

• Built-in TSD (Thermal shutdown)

• Low saturation voltage

• Digital input: TTL, 5V CMOS compatible

• Built-in current-mode control circuit (I

: 1A)

PEAK

1

Typical Application

Ordering Information

• 3.5-inch floppy disk drive(FDD) spindle motor driver

Device

Package

Operating Temp.

0 ~ 75°C

KA2822CD 28-SSOPH-375

KA2822CDTF 28-SSOPH-375

0 ~ 75°C

Rev. 1.0.0

KA2822CD

Pin Assignments

FG INPUT(−)

FG INPUT(+)

28

1

AGC

HALL BIAS

27

26

2

3

INDEX PULSE WIDTH

VOLTAGE REG

CURRENT DETECTION1

V INPUT(−)

25

24

23

22

4

5

INDEX BURST

INDEX OUTPUT

CE

V INPUT(+)

U PHASE OUTPUT

V PHASE OUTPUT

6

7

FIN

KA2822D

FIN

SIGNAL GROUND

FG ZERO CROSS

FG OUTPUT

W PHASE OUTPUT

NC

8

21

9

20

19

U INPUT(+)

10

RPM SELECT

CHARGE PUMP OUTPUT

OSC INPUT

U INPUT(−)

11

18

CURRENT DETECTION2

12

13

14

17

16

15

V

CC

PHASE COMPENSATION

NC

2

KA2822CD

Pin Definitions

Pin Number

Pin Name

FG_INPUT

AGC

I/O

I

Pin Function Description

Negative input pin FG signal amp.

Automatic gain control input pin

Index pulse width detection (1.1V) pin

Voltage (2.2V) generator output pin

Index pulse width detection (1.4V) pin

Index pulse output pin

1

2

I

3

4

INDEX PULSE WIDTH

VOLTAGE REGULATOR

INDEX BURST

O

I

5

6

INDEX OUTPUT

CE

7

Chip enable (Active low)

8

SIGNAL GROUND

FG ZERO CROSS

FG OUTPUT

-

Signal ground

9

O

I

FG signal zero cross detection pin

FG signal output pin

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

FIN

RPM SELECT

RPM selection pin (L: 300, H: 360rpm)

Charge pump output pin

CHARGE PUMP OUTPUT

OSC INPUT

O

I

1MHz oscillation input pin

No connection

NC

-

PHASE COMPENSATION

I

Phase compensation cap. connection pin

5V power supply pin

V

-

CC

CURRENT DETECTION2

U INPUT (−)

I

Over current detection pin

Negative input pin of U phase amp

Positive input pin of U phase amp

No connection

I

U INPUT (+)

I

NC

-

W PHASE OUTPUT

V PHASE OUTPUT

U PHASE OUTPUT

V INPUT (+)

O

I

W phase output pin

V phase output pin

U phase output pin

Positive input pin of V phase amp

Negative input pin of V phase amp

Over current detection pin

Hall sensor bias input pin

Positive input pin of FG signal amp

Power ground

V INPUT (−)

I

CURRENT DETECTION1

HALL BIAS

I

FG INPUT (+)

I

POWER GROUND

-

3

KA2822CD

Internal Block Diagram

CURRENT

V

DETECTION2 DETECTION1

CC

16

17

26

U INPUT (+)

19

+

U_OUT

23 U PHASE

OUTPUT

U_AMP

−

U INPUT(−)

18

24

V INPUT (+)

+

Output

Control

V_AMP

−

22 V PHASE

OUTPUT

V_OUT

W_OUT

V INPUT(−)

25

2

AGC

21

W PHASE

OUTPUT

HALL BIAS

Start-up

CE

27

7

Hall

Zero-cross

TSD

CE

CON_AMP

−

1.3V

FG_AMP

+

0.24V

0.69V

15

PHASE

COMPENSATION

FG INPUT(+) 28

+

FG

Zero-cross

−

FG INPUT(−)

1

+

BUF_AMP

10

9

FG OUTPUT

FG ZERO

CROSS

Burst_time

Circuit

Timing

Detector

Pulse_width

Adjustment

6

3

INDEX

OUTPUT

VOLTAGE REG.

4

INDEX PULSE

WIDTH

2.2V

5

INDEX BURST

OSC INPUT

Rpm_select

11_divider

Speed

Control

Charge

Pump

12

CHARGE

PUMP

OUTPUT

13

OSC

14

11

8

20

NC

RPM

SELECT

SIGNAL

GROUND

FIN

4

KA2822CD

Equivalent Circuits

U_amp, V_ amp input

U, V, W drive output and current detection 1, 2

vcc

(17Pin,

26Pin)

V

CC

vcc

(16Pin)

5kΩ

2.5kΩ

U

V

(23Pin)

(19Pin,

24Pin)

(18Pin,

25Pin)

(22Pin)

W

(21Pin)

40kΩ

FG input and FG output

OSC input

vcc

0.5kΩ

(28Pin)

(1Pin)

0.1kΩ

1kΩ

(13Pin)

vcc

50pF

vcc

25kΩ

5kΩ

(10Pin)

CE input

Hall bias input and voltage regulator output

vcc

2.9V

vcc

(27Pin)

vcc

CE

(7Pin)

3kΩ

(4Pin)

2.2V

5

KA2822CD

Equivalent Circuits

Index pulse width detection output

Phase compensation and current detection 1, 2

vcc vcc vcc vcc

vcc

(15Pin)

(3Pin)

(17Pin,

26Pin)

2kΩ

RPM select input

AGC input

vcc

AGC

(2Pin)

6kΩ

(11Pin)

To U amp, V amp

(Current control)

Index output

Index burst output

vcc

(6Pin)

2kΩ

1.4V

(5Pin)

6

KA2822CD

Equivalent Circuits

FG zero cross output

vcc

(9Pin)

Charge pump output

vcc

to

(12Pin)

IIL

Circuit

vcc

Charge pump

Buffer amp

7

KA2822CD

Absolute Maximum Rating (Ta=25°C)

Parameter

Symbol

Value

Unit

V

Maximum power supply voltage

Maximum input voltage

Maximum output current

Normal output current

Power dissipation

V

7.0

CCMAX

V

0 ~ V

1

V

INMAX

OMAX

CC

I

A

I

O

0.7

1.5

A

P

W

°C

D

Operating temperature

Junction temperature

Storage temperature

T

A

0 ~ 75

150

T

J

T

−55 ~ +125

STG

Power Dissipation Curve

2.0

1.5

1.0

Power

Dissipation

: PD[W]

0.5

0

25

50

75

100

125

150

175

Ambient temperature, Ta [°C]

Power dissipation decreases in the rate of 12.0mV / °C when mounted on 50mm × 50mm × 1mm PCB (Phenolic resin mate-

rial) and used above Ta=25°C.

Recommended Operating Conditions (Ta=25°C)

Parameter

Symbol

Min.

4.5

0

Typ.

5.0

-

Max

5.5

70

Unit

V

Supply voltage

V

CC

Ambient operating temperature range

Ta

°C

Temperature Characteristic

Parameter

Symbol

Min.

Typ.

Max

Unit

note

Thermal shutdown temperature

TSD

125

150

-

°C

NOTE:

Design reference value

8

KA2822CD

Electrical Characteristics

(Ta=25°C, V =5V, unless otherwise specified)

CC

Parameter

Symbol

Conditions

Min. Typ. Max.

Unit

SUPPLY CURRENT

V

=5.5V

CC

Supply current 1

I

-

1.0

15

2.0

23

mA

CCO

CE=H, RPM=L

Supply current 2

CHIP ENABLE

Input current

I

V

CC

=5.5V, CE=L

CC

I

CE=0~5V

-

5

-

10

1.0

-

µA

V

CE

Input low voltage

Input high voltage

RPM SELECT

Input current

V

-

CEL

CEH

V

3.5

-

V

I

-

5

-

10

1.0

-

µA

V

RPM

Input low voltage

Input high voltage

HALL AMP

V

-

RPML

RPMH

V

3.5

-

V

note

Input resistance

RI

-

1

10

-

kΩ

N

note

Common mode input voltage range

V

2.0

140

V

COM

CC

note

Differential input voltage range

V

-

420

mV

PP

DIF

START-UP

Hall bias voltage 1

Hall bias voltage 2

Reference voltage

Bias off current

V

I =4mA, CE=L

2.3

2.7

1.7

-

2.5

2.9

2.2

5

2.7

3.1

2.7

10

V

HB1

H

V

HB2

I =10mA, CE=L

H

V

Vref

I =1mA, CE=L

O

I

V =5.5V, CE=H

H

µA

HOFF

OUTPUT AMP

Leakage current

I

-

0.5

1.0

1.3

1

mA

V

CER

Saturation voltage 1

Saturation voltage 2

BUFFER & CONTROL AMP

Vsat1

Vsat2

I =0.35A

1.2

1.8

O

I =0.7A

O

V

note

Voltage gain 1

G

-

−11

-

dB

V

CT1

note

Reference voltage 1

Vref1

Vref2

Current limiter voltage 0.205 0.208 0.210

Control begin voltage 0.69

note

Reference voltage 2

-

V

Notes:

Design reference value

9

KA2822CD

Electrical Characteristics (Continued)

(Ta=25°C, V =5V, unless otherwise specified)

CC

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

CHARGE PUMP

Charge current

Discharge current

I

RPM=L

/ I

−15

15

0.9

-

−20

20

1.0

-

−25

25

µA

-

CP−

CP+

note

Current ratio

I

1.1

50

R

CP+ CP−

Off current

I

V

=0.63V

CP

nA

V

OFF

note

Clamp voltage

V

-

1.3

1.5

CLP

FG AMP

note

Output DC voltage

Voltage gain 2

Input voltage range

V

-

1.0

24

2.0

-

1.3

1.6

44

V

FG

G

34

-

dB

FG

V

20

mV

IN

P-P

note

Noise margin 1

N

Differential noise

-

0.5

mV

D

C

note

Noise margin 2

N

Common mode noise

-

V

P-P

SPEED CONTROL

note

Count range 1

N1

N2

RPM=L

RPM=H

-

1666.5

1388.5

1.0

-

note

Count range 2

Operating freq.

F

D

1.1

MHz

BURST ADJUSTMENT

Input current

I

-

RPM=L

-

1

2

µA

V

BI

Threshold voltage 1

Threshold voltage 2

PULSE WIDTH ADJUSMENT

Ct2 charge current

Threshold voltage 3

INDEX OUTPUT

V

1.2

1.05

1.45

1.3

1.7

TH1

TH2

RPM=H

1.55

V

I

-

−19

−25

−36

µA

CT2

V

0.9

1.1

1.3

V

TH3

note

Output leakage current

I

-

1

2

µA

OH

Output low voltage

V

I =1mA

O

0.2

0.4

V

O1

Notes:

Design reference value

10

KA2822CD

Application Information

1. Chip Enable

This function turns on or off all blocks by low or high signal (active low).

2. U, V And W Phase Output Amp

These ampilifiers drive three output phases - U, V, and W which have 120 degree phase differences with each other. The three

phase waveforms are made with the two hall sensor signals by synthesizing the third phase signal.

3. Speed Control Part

This function compares the real motor rotation frequency with the 300 or 360Hz pulse divided from 1MHz clock pulse for

removing speed error when the motor is ’on’ and speed error is detected by PLL. The speed error is sent to the charge pump,

which repeats charging and discharging by the error. The charge pump output controls the output current to keep a stable rota-

tional speed.

4. Sensorless Index Signal Generation

KA2822CD can make index signals without an index hall sensor by special rotor magnetization.

11

KA2822CD

Typical Application Circuits

+5V

220nF

1

SW1

DISK_IN

W_P

100

H_D

100nF

SW2

U PHASE OUTPUT

V PHASE OUTPUT

W PHASE OUTPUT

U

V

U INPUT(+)

HU

19

18

24

16

17

26

23

LED

U INPUT(−)

22

21

V INPUT(+)

V INPUT(−)

HALL BIAS

AGC

W

HV

+5V

PHASE COMPENSATION

1.8M

25

27

2

15

10k

INDEX OUTPUT

CE

6

3

KA2822D

CE

7

OSC INPUT

100nF

FG_INPUT(+)

FG_INPUT(-)

28

1

47nF

CHARGE PUMP OUTPUT

12

47nF

FG ZERO CROSS

9

100nF

10nF

4

5

56k

VOLTAGE REGULATOR

INDEX BURST

330k

VR

13 11

8

47nF

47k

1MHz

RPM_SEL

INDEX

12

KA2822CD

13

KA2822CD

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

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, 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

4/18/03 0.0m 001

Stock#DSxxxxxxxx

 2003 Fairchild Semiconductor Corporation


型号：	KA2822CD
厂家：	FAIRCHILD SEMICONDUCTOR
描述：	3-Phase BLDC Motor Driver 三相BLDC电机驱动器驱动器光电二极管电动机控制电机
文件：	总14页 (文件大小：444K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

KA2822CD [FAIRCHILD]

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