BA6859AFP-Y,BA6664FM,BD6671FM

Technical Note

6/17

www.rohm.com

2010.06 - Rev.A

© 2010 ROHM Co., Ltd. All rights reserved.

0

25

50

75

100

125

150

1.0

2.0

2.2

Pd[W]

Ta(℃)

85

Fig.7 Power Dissipation Reduction (BA6664FM、BD6671FM)

(70 mm x 70 mm x 1.6 mm).

2) BA6664FM

Fig.6 BA6664FM Block Diagram

BA6664FM Pin Function Table

Pin No. Pin name

Function

1

N.C.

N.C.

2

A3

Output pin

3

N.C.

N.C.

4

A2

Output pin

5

N.C

N.C.

6

N.C.

N.C.

7

A1

Output pin

8

GND

GND pin

9

H1+

Hall signal input pin

10

H1-

Hall signal input pin

11

H2+

Hall signal input pin

12

H2-

Hall signal input pin

13

H3+

Hall signal input pin

14

H3-

Hall bias input pin

15

VH

Hall bias input pin

16

BR

Brake mode pin

17

CNF

Capacitor connection pin for phase

compensation

18

SB

Short brake pin

19

FG2

FG 3-phase component output pin

20

FR

Rotation detection pin

21

ECR

Output voltage control reference pin

22

EC

Output voltage control pin

23

PS

Power-saving pin

24

FG

FG signal output pin

25

VCC

Power supply pin

26

GSW

Gain switching pin

27

VM

Motor power supply pin

28

RNF

Resistance connection pin for output

current detection

FIN

FIN

GND

PS

TL

TSD

GAIN

CONTROL

DRIVER

14

13

12

11

10

9

8

7

4

2

28

26

27

25

23

24

21

22

19

20

17

18

FIN

HALL AMP

VCC

TORQUE

SENSE AMP

-

+

-

+

VH

BR

SB

FG2

FR

ECR

EC

PS

FG

VCC

GSW

VM

RNF

CURRENT

SENSE AMP

15

Hall Bias

BRAKE MODE

VCC

H3+

H2-

H2+

H1+

GND

A1

A2

A3

VCC

CK

R

D

Q

－

Hall1

Hall1

Hall1

1µF

SERVO

SIGNAL

0.5Ω

+

-

The power saving mode is turned ON by low-level voltage,

and the circuit current and motor output will stop.

If the ECR voltage is set between 1.6 and 2.2V, the

maximum torque limit current will be obtained.

The detection of motor rotation direction is possible.

The short brake is operated regardless of brake mode settings.

Connect a capacitor for phase compensation.

The recommended value is 0.1µF.

Short brake and reversed brake settings are possible.

The motor torque current is controllable.

500Ω

0.1µF

500Ω

Capacitor for noise level mitigation.

The recommended value is 0.47 µF to 10 µF.

+

-

Speed detection is attained by FG signal output.

Resistor for setting Hall input level .

The recommended value is 200 Ω to 1k Ω.

Output will be open when the reverse rotation of the motor is

detected.

Output to the motor will be opened at a chip tempe

175°C (Typ.). Do not use the IC in excess of a chip

rature of temperature of 150°C.

Torque limit current and I/O gain settings are made by

the RNF resistance value.

Resistance of 0.4 to 1.0Ω is recommended.

16

CNF

Q

SHORT BRAKE

GAIN

SWITCH

-

+

-

+

-

+

-

+

-

+

I/O gain

1µF

RNF