www.fairchildsemi.com

Rev. 1.0.1

May. 2000.

Features

· 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
· Built-in chip enable function
· Built-in digital speed control circuit
· Built-in current limit circuit
· Index sensorless
· Built-in TSD (Thermal shutdown)
· Low saturation voltage
· Digital input: TTL, 5V CMOS compatible
· Built-in current-mode control circuit (I

PEAK

: 1A)

Description

The KA2822D is a monolithic integrated circuit, and suit-
able for the three-phase spindle motor driver of FDD system.

28-SSOPH-375

Typical Application

· 3.5-inch floppy disk drive (FDD) spildle motor
· Other 3-phase BLDC motor

Ordering Information

Device

Package

Operating Temp.

KA2822D

28-SSOPH-375

0 ~ 75

KA2822DTF

28-SSOPH-375

0 ~ 75

KA2822BD

28-SSOPH-375

0 ~ 75

KA2822BDTF 28-SSOPH-375

0 ~ 75

KA2822D

3-Phase BLDC Motor Driver

KA2822D

Pin Assignments

FG INPUT(

)

AGC

INDEX PULSE WIDTH

VOLTAGE REG

INDEX BURST

INDEX OUTPUT

SIGNAL GROUND

FG ZERO CROSS

FG OUTPUT

RPM SELECT

CHARGE PUMP OUTPUT

OSC INPUT

FG INPUT(+)

HALL BIAS

CURRENT DETECTION1

V INPUT(

)

V INPUT(+)

U PHASE OUTPUT

V PHASE OUTPUT

W PHASE OUTPUT

U INPUT(+)

U INPUT(

)

CURRENT DETECTION2

PHASE COMPENSATION

FIN

KA2822D

KA2822D

Pin Definitions

Pin Number

Pin Name

I/O

Pin Function Description

FG_INPUT

Negative input pin FG signal amp.

AGC

Automatic gain control input pin

INDEX PULSE WIDTH

Index pulse width detection (1.1V) pin

VOLTAGE REGULATOR

Voltage (2.2V) generator output pin

INDEX BURST

Index pulse width detection (1.4V) pin

INDEX OUTPUT

Index pulse output pin

Chip enable (Active low)

SIGNAL GROUND

Signal ground

FG ZERO CROSS

FG signal zero cross detection pin

FG OUTPUT

FG signal output pin

RPM SELECT

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

CHARGE PUMP OUTPUT

Charge pump output pin

OSC INPUT

1MHz oscillation input pin

No connection

PHASE COMPENSATION

Phase compensation cap. connection pin

5V power supply pin

CURRENT DETECTION2

Over current detection pin

U INPUT (

)

Negative input pin of U phase amp

U INPUT (+)

Positive input pin of U phase amp

No connection

W PHASE OUTPUT

W phase output pin

V PHASE OUTPUT

V phase output pin

U PHASE OUTPUT

U phase output pin

U INPUT (+)

Positive input pin of V phase amp

V INPUT (

)

Negative input pin of V phase amp

CURRENT DETECTION1

Over current detection pin

HALL BIAS

Hall sensor bias input pin

FG INPUT (+)

Positive input pin of FG signal amp

FIN

POWER GROUND

Power ground

KA2822D

Internal Block Diagram

U_AMP

V_AMP

U_OUT

V_OUT

W_OUT

TSD

Output
Control

Hall
Zero-cross

Start-up

AGC

1.3V

FG_AMP

2.2V

FG
Zero-cross

Timing
Detectpr

Burst_time
Circuit

Pulse_width
Adjustment

OSC

Rpm_select
11_divider

Speed
Control

Charge
Pump

BUF_AMP

CON_AMP

0.24V

0.69V

U INPUT (+)

U INPUT(

)

AGC

V INPUT (+)

V INPUT(

)

HALL BIAS

FG INPUT(+)

FG INPUT(

)

FG OUTPUT

FG ZERO

VOLTAGE REG.

INDEX BURST

OSC INPUT

CROSS

CURRENT
DETECTION2

CURRENT
DETECTION1

U PHASE
OUTPUT

U PHASE

W PHASE

PHASE

INDEX

INDEX PULSE

CHARGE
PUMP
OUTPUT

WIDTH

OUTPUT

COMPENSATION

OUTPUT

RPM

SIGNAL

FIN

SELECT

GROUND

KA2822D

Absolute Maximum Rating (Ta=25

Power Dissipation Curve

Power dissipation decreases in the rate of 13.5mV /

C when mounted on 50mm

50mm

1mm PCB (Phenolic resin mate-

rial) and used above Ta=25

Recommended Operating Conditions

(Ta=25

Temperature Characteristic

NOTE:
Reference value

Parameter

Symbol

Value

Unit

Maximum power supply voltage

CCMAX

7.0

Maximum input voltage

INMAX

0 ~ V

Maximum output current

OMAX

Normal output current

0.7

Power dissipation

1.5

Operating temperature

0 ~ 75

Junction temperture

150

Storage temperature

STG

55 ~ +125

Parameter

Symbol

Min.

Typ.

Max

Unit

Supply voltage

CC1

, V

CC2

10.8

12.0

13.2

Supply voltage in logic part

CC3

4.5

5.0

5.5

Ambient operating temperature range

+70

Parameter

Symbol

Min.

Typ.

Max

Unit

Thermal shutdown temperature

note

TSD

125

150

100

125

Ambient temperature, Ta [

150

175

0.5

1.0

1.5

2.0

Power
Dissipation
: PD[W]

KA2822D

Electrical Characteristics

(Ta=25

C, V

=5V)

Notes:
Reference value

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Units

SUPPLY CURRENT

Supply current 1

CCO

=6.5V

CE=H, RPM=L

1.0

2.0

Supply current 2

=6.5V, CE=L

CHIP ENABLE

Input current

CE=0~5V

Input low voltage

CE1

1.0

Input high voltage

CEH1

3.5

RPM SELECT

Input current

RPM

CE=0~5V

Input low voltage

RPM1

1.0

Input high voltage

RPMH

3.5

HALL AMP

Input resistance

note

Common mode input voltage range

note

COM

2.0

Differential input voltage range

note

DIF

100

420

START-UP

Hall bias voltage 1

HB1

=4mA, CE=L

2.3

2.5

2.7

Hall bias voltage 2

HB2

=10mA, CE=L

2.7

2.9

3.1

Reference voltage

Vref

=1mA, CE=L

1.7

2.2

2.7

Bias off current

HOFF

=7V, CE=H

OUTPUT AMP

Leakage current

CER

0.5

Saturation voltage 1

Vsat1

=0.35A

1.0

1.2

Saturation voltage 2

Vsat2

=0.7A

1.3

1.8

BUFFER & CONTROL AMP

Voltage gain 1

note

CT1

Reference voltage 1

note

Vref1

Current limiter voltage

0.205

0.208

0.210

Reference voltage 2

note

Vref2

Control begin voltage

0.69

KA2822D

Electrical Characteristics (Continued)

(Ta=25

C, V

=5V)

Notes:
Reference value

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Units

CHARGE PUMP

Charge current

RPM=L

Discharge current

CP+

RPM=L

Current ratio

note

CP+

/ I

0.9

1.0

1.1

Off current

OFF

=0.63V

Clamp voltage

note

CLP

1.3

1.5

FG AMP

Output DC voltage

note

1.0

1.3

1.6

Voltage gain 2

Input voltage range

note

2.0

P-P

Noise margin 1

note

Differential noise

0.5

P-P

Noise margin 2

note

Common mode noise

0.5

P-P

SPEED CONTROL

Count range 1

note

RPM=L

1666.5

Count range 2

note

RPM=H

1388.5

Operating freq.

1.0

1.1

MHz

BURST ADJUSTMENT

Input current

Threshold voltage 1

TH1

RPM=L

1.2

1.45

1.7

Threshold voltage 2

TH2

RPM=H

1.05

1.3

1.55

PULSE WIDTH ADJUSMENT

Ct2 charge current

CT2

Threshold voltage 3

TH3

0.9

1.1

1.3

INDEX OUTPUT

Output leakage current

note

Output low voltage

=1mA

0.2

0.4

KA2822D

Application Information

1. CHIP ENABLE

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

2. U, V AND W PHASE OUTPUT AMP

These ampilifiers drives 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 motor is on and speed error is detected by PLL.

The speed error sent to charge pump part which repeats charge and discharge controls the output current of the output amp to
keep a stable rotation.

KA2822D

Typical Application Circuits

+5V

220nF

100

100nF

SW1

DISK_IN

W_P

H_D

LED

1MHz

RPM_SEL

INDEX

SW2

47nF

56k

47k

47nF

100nF

10nF

100nF

330k

1.8M

+5V

10k

13 11

17
26

KA2822D

U INPUT(+)

U INPUT(

)

U INPUT(+)

U INPUT(

)

HALL BIAS

AGC

FG_INPUT(+)

FG_INPUT(-)

FG ZERO CROSS

VOLTAGE REGULATOR

INDEX BURST

OSC I

PUT

RPM SELECT

GNA

GROUND

CHARGE PUMP OUTPUT

OSC INPUT

INDEX OUTPUT

PHASE COMPENSATION

W PHASE OUTPUT

V PHASE OUTPUT

U PHASE OUTPUT

CURRENT DETECT

I
O

CURRENT DETECT

I
O

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.

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

Preliminary

No Identification Needed

Obsolete

This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.

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.

This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.

This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.

Formative or
In Design

First Production

Full Production

Not In Production

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.

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