LB1998 datasheet(8/9 Pages) SANYO

8 / 9 page

LB1998

No. 5979-8/9

Pin number

Pin name

Pin voltage

Equivalent circuit

Pin function

0V to 3.5V

PWR GND

R F

BRAKE

Continued from preceding page

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

prevents reverse rotation.)

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

VCREF

VCIN

WOUT

VOUT

UOUT

FGSEL

VCC1

µA

µA25µA15µA

68 k

Ω

200

Ω

A11201

VCC1

µA

µA6µA

200

Ω

6 pF

A11202

PWRGND

VCC2

3.9

Ω

3.9

Ω

20 21 22

A11203

VCC1

50 k

Ω

75 k

Ω

A11204

100

µA

VCC1

50 k

Ω

75 k

Ω

A11205

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