Toshiba TA8493BF Datasheet

Toshiba Bipolar Linear Integrated Circuit Multi-Chip

TA8493F, TA8493AF, TA8493BF

3-Phase Full Wave Brushless DC Motor Driver IC for CD-ROM Drives

These 3-phase, full-wave, brushless DC motor driver ICs have been developed for use in CD-ROM drive spindle motors. The TA8493F/ AF/ BF contain in its upper stage a discrete power transistor (P-ch-MOS) and uses direct PWM control system, which enables the IC to provide superior thermal efficiency.

Furthermore, the multi-chip structure of this device facilitates dispersion of the heat generated inside the package, making it possible to suppress heat concentration.

Features

· Multi-chip structure (3 × 2SJ465 chips built-in)

· Direct PWM control system

· Drive system: 120°drive system (TA8493F/BF)

: 180°drive system (TA8493AF)

· Built-in current limiter: I

· Built-in reversing brake/short brake functions

· FG signal output (using hall element output signal)

· Built-in hall bias

· Built-in thermal shutdown circuit

· Package: MFP-30

= 0.7 A (typ.) (at RF = 0.33 Ω)

LIM

Weight: 0.63 g (typ.)

TA8493F/AF/BF

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Block Diagram

f

V

CC

5 V

15

+

H

a

14

-

H

a

13

+

H

b

12

-

H

b

16

+

H

c

17

-

H

c

10

FGO

18

HB

21

V

C

V

22

re

L

La (G)

V

CC

Matrix

Amplifier

20 2 1 27

(G) Lc (G)

b

TSD

Reverse

Detection

GND

PWM Signal

TA8493F/AF/BF

V

29

4

3 30 28

6 25

8

M1

V

M2

L

a

L

b

L

c

R

F1

R

F2

C

RF

12 V

F/F

OSC

SB

Mode Select MS

OSC

Short Brake

23 1924 71126

BRK

GND1

GND2

Stand by

C

d

5

2SJ465 ´ 3

9 pin: N.C.

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PIN Assignment

TA8493F/AF/BF

Terminal

No.

1 Lb (G)

2 La (G)

3 La a-phase output terminal Connect to the coil. 4 VM2 Supply voltage terminal for motor drive Connect to VM1 externally. 5 SB RUN/STOP control terminal H: RUN, L: STOP

6 RF1 Output current detection terminal

7 GND2 GND ¾

8 CRF Output current filter terminal

9 N.C.

10 FGO FG amplifier output terminal

11 BRK Brake mode select terminal Output mode when VC > V 12 H 13 H 14 H 15 H 16 H 17 H

18 HB Hall element bias terminal

19 Cd

20 VCC Supply voltage terminal for control circuits V 21 VC Control amplifier input terminal Use the control signal as input.

22 V

23 OSC Triangular wave oscillation terminal

24 GND1 GND ¾

25 RF2 Output current detection terminal

26 MS Mode select terminal Determines output mode.

27 Lc (G)

28 Lc c-phase output terminal Connect to the coil. 29 VM1 Supply voltage terminal for motor drive Connect to VM2 externally. 30 Lb b-phase output terminal Connect to the coil.

Terminal

Symbol

b-phase upper side power transistor (base) output terminal

a-phase upper side power transistor (base) output terminal

-

b-phase negative hall signal input terminal Connect to hall element output terminal.

b

+

b-phase positive hall signal input terminal Connect to hall element output terminal.

b

-

a-phase negative hall signal input terminal Connect to hall element output terminal.

a

+

a-phase positive hall signal input terminal Connect to hall element output terminal.

a

+

c-phase positive hall signal input terminal Connect to hall element output terminal.

c

-

a-phase negative hall signal input terminal Connect to hall element output terminal.

c

Forward/reverse changeover gain adjustment terminal

ref

Control amplifier reference voltage input terminal

c-phase upper side power transistor (base) output terminal

Function Remarks

Keep open.

Sets limiter current value. Connect to R

terminal and GND.

Connect a capacitor between this terminal and GND.

Outputs a signal whose frequency is determined by the CD rotation frequency.

Open collector output. Connect to the negative side of hall element bias line.

Adjust a rotation direction changeover gain

CC (opr)

Use the reference voltage for the control amplifier as input.

Connect a capacitor between this terminal and GND.

Sets limiter current value. Connect to R

terminal and GND.

Keep open.

externally and between this

F2

= 4.5 to 5.5 V

externally and between this

F1

ref

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2002-01-31

TA8493F/AF/BF

Absolute Maximum Ratings

Characteristics Symbol Rating Unit

Power Supply Voltage

Output Current IO 1.5 A

Power Dissipation

Junction Temperature Tj 150 °C Operating Temperature T Storage Temperature T

(Ta ==== 25°C)

VCC 7

V

16

M

P

D

(Note1)

opr

stg

V

1.0 W

-20 to 75 °C

-55 to 150 °C

Note1: unmounted

Operating Voltage Range

Characteristics Symbol

Power Supply Voltage

Electrical Characteristics

VCC 4.5 to 5.5

V

10 to 14

M

(VCC ==== 5 V, VM ==== 12 V, Ta ==== 25°C)

Operating

Range

Unit

V

Characteristics Symbol

I

V

DV

INS (L)

CC1

I

CC2

INH

CMRH

H

CMRC

INC

V

DZ

OFF (F)

OFF (R)

I

LIM

V

LIM INS (H) INS (L)

Supply Voltage

Input Current I

Hall Amp.

Hall Element Bias Saturation Voltage VHB 2 IHB = 10 mA ¾ 1.3 2.0 V

Control Amp.

Current Limit Amp.

RUN/STOP Control Circuit

Common Mode Input Voltage Range

Input Amplitude V

Common Mode Input Voltage Range

Input Current I

Dead Zone Voltage Width

Input Offset Voltage

Limit Current

Input Voltage (H) V Input Voltage (L) V Input Current I

Test

Circuit

Stop mode ¾ 0.3 0.8

V

¾

¾ RF = 0.33 W (Note2) ¾ 700 ¾ mA

3 ¾ 0.25 0.3 0.35 V

1

Run mode, output open ¾ 7 15

2

¾ 1.5 ¾ 4.0 V

¾ 0.5 ¾ 4.0 V

2

V (source current)

V

(RUN) 3.0 ¾ V (STOP) GND ¾ 1.0

CW mode, V R

2

CCW mode, V R

1

V

Test Condition Min Typ. Max Unit

= 2.5 V, (sink current) ¾ ¾ 2 mA

CMRH

¾ 100 ¾ ¾ mV

= V

= 1.65 V,

C

ref

= 1.65 V, RF = 0.33 W

ref

(Note2)

= 1.65 V,

= 0.33 W

F

= 0.33 W

F

INS

ref

= 1.65 V,

ref

= GND, (source current) ¾ ¾ 1 mA

¾ ¾ 5.0 mA

¾ 100 ¾

20 50 150

CC

mA

p-p

mV

V

Note2: this is not tested.

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TA8493F/AF/BF

Characteristics Symbol

Output Resistance (upper side)

Saturation

Output Circuit

Voltage (lower side)

Cut-off Current (upper side)

Cut-off Current (lower side)

Input Voltage (H) V

Mode Select Circuit

Input Voltage (L) V

Input Current I Hysteresis

Voltage

FG Amp.

Output Voltage (H)

Output Voltage (L)

Input Voltage (H) V

Short Brake Circuit

Input Voltage (L) V Input Current I

Triangular Oscillation Circuit

Oscillation Frequency

Thermal Shut-down Operating Temperature

Test

Circuit

R

I

ON (U)

Test Condition Min Typ. Max Unit

= 0.6 A ¾ 0.5 1.0 W

O

4

V

SAT (L)

I

V

L (U)

IO = 0.6 A ¾ 0.4 0.8 V

= 16 V ¾ ¾ 10

L

5

I

L (L)

MS (H)

MS (L)

INMS

V

8 ¾ 5 20 45 mV

HYS

V

Source current: 10 mA

OFG (H)

OFG (L)

¾ 3.0 ¾ V

BRK (H)

¾ ¾ ¾ 0.5

BRK (L)

INBRK

f

¾ C = 560 pF (Note2) ¾ 39 ¾ kHz

OSC

VL = 16 V ¾ ¾ 10

CCW mode

> V

C

> V

, BRK: L

ref

, BRK: L

ref

V

6

Reversing brake mode V

3.0 ¾ V

¾ ¾ 0.5

VMS = GND, (source current) ¾ ¾ 1 mA

V

CC

7

- 0.5

¾ ¾

Sink current: 10 mA ¾ ¾ 0.5

6

V

= GND, (source current) ¾ ¾ 1 mA

BRK

Junction temperature

TSD ¾

(according to design

¾ 175 ¾ °C

specification) (Note2)

CC

mA

V

p-p

V

Note2: this is not tested.

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2002-01-31

Function Table

Forward Reverse

Ha Hb Hc La Lb Lc La Lb Lc

H L L H L M L H M H H L H M L L M H

L H L M H L M L H L H H L H M H L M L L H L M H H M L

H L H M L H M H L

La = -(Hc - Ha) La = (Hc - Ha) L

= -(Ha - Hb) Lb = (Ha - Hb)

b

L

= -(Hb - Hc) Lc = (Hb - Hc)

c

Timing Diagram

(TA8493F/BF)

H

a

+

H

b

H

c

TA8493F/AF/BF

Hall Signal

V

Output Voltage

GND

Output Current

-

L

M

+

-

a

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(TA8493AF)

Hall Signal

Output Voltage

GND

TA8493F/AF/BF

H

a

+

-

V

M

H

b

H

c

L

a

Output Current

+

-

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2002-01-31

Functional Description

This IC is a 3-phase, full wave brushless DC motor driver of the direct PWM control type.

· Control amp input circuit

V

CC

TA8493F/AF/BF

V

C

V

ref

The common mode input voltage ranges for both V

and V

C

are 0.5 to 4.0 V.

ref

Relation between control input and PWM ON duty is shown below, PWM ON duty is 100% when ïV

- VCï = 0.75 V (typ.)

ref

The input is provided with a dead-zone area whose voltage width is 100 mV (typ.)

100

Dead-zone

voltage width

100 mV (typ.)

PWM on duty (%)

0.5

V

- 0.75 V

ref

V

ref

VC (V)

ref

+ 0.75

· Mode select/short brake circuit

MS

BRK

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2002-01-31