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LB1997

Three-Phase Brushless Motor Driver for CD-ROM Spindle Drive

SANYO -> Panasonic 

LB1997

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Pin number Pin name Pin voltage

10

VCREF

2V to 3V

11

VC

0V to VCC1

Equivalent circuit

22

200Ω

25µA

25µA

10 kΩ

30 kΩ

15 kΩ 30 kΩ

100µA

200Ω

100µA

VCC1

21

A11189

Pin function

Control reference voltage supply

pin. Determines control start

voltage.

Speed control voltage supply pin

V type control technique

VC > VCREF : Forward

VC < VCREF : Slowdown

(Reverse-blocking circuit built in to

prevent reverse rotation.)

12

WOUT

13

PWR GND

15

VOUT

16

UOUT

20

RF

8

CC

3

BRAKE

VCC2

5

3.9Ω

23 1 2

3.9Ω

24

A11190

8 kΩ

8 kΩ

75 kΩ

50 kΩ

VCC1

19

100µA

A11191

VCC1

75 kΩ

16

50 kΩ

A11192

W phase output

Output transistor GND

V phase output

U phase output

Upper side output PNP transistor

collector pin (common for all 3

phases). For current detection,

connect resistor between VCC3

pin and RF pin. Constant current

control and current limiter works

by detecting this voltage.

V type control/single-side control

switching pin

CC:

High –> Single-side control

Low/Open –> V type control

Short brake pin

BRAKE:

High –> Short brake operation

Low/Open –> Motor drive operation

No. 5978-8/9

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