LB1998 데이터 시트보기 (PDF) - SANYO -> Panasonic

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LB1998

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

SANYO -> Panasonic 

Continued from preceding page

Pin number Pin name Pin voltage

23

VCREF

0V to 3.5V

LB1998

Equivalent circuit

15µA

25µA

25µA

15µA

VCC1

68 kΩ

200Ω

23

Pin function

Control reference voltage supply

pin. Determines control start

voltage.

1

VCIN

0V to 3.5V

22

WOUT

PWR GND

21

VOUT

20

UOUT

18

RF

25

FGSEL

7

BRAKE

A11201

Speed control voltage supply pin

VCC1

V type control technique

6µA

6µA

6µA

VC > VCREF : Forward

VC < VCREF : Slowdown

200Ω

(Reverse-blocking circuit

1

6 pF

23

prevents reverse rotation.)

3.9Ω

3.9Ω

A11202

VCC2

18

20 21 22

PWRGND

A11203

100µA

75 kΩ

50 kΩ

VCC1

25

A11204

VCC1

75 kΩ

3

50 kΩ

A11205

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.

1 Hall FG/3 Hall FG output,

switching pin:

High –> 3 Hall FG

Low/Open –> 1 Hall FG

Brake mode switching pin

BRAKE:

High –> Short brake

Low/Open –> Reverse brake

Brake mode changes when

VCIN > VCREF.

Continued on next page

No. 5979-8/9

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