LB1989 データシートの表示（PDF） - SANYO -> Panasonic

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LB1989

Three-Phase Sensorless VCR Drum Motor Driver

SANYO -> Panasonic 

Pin Functions

Pin No.

27

Pin

UOUT

Pin voltage

1

VOUT

2

WOUT

26

RF

LB1989

Equivalent circuit

26

S/S

7

VCC

8 to 13.8 V

5

MCOM

8

UIN

9

VIN

10

WIN

11

C1

12

C2

Function

Drum motor driver outputs

The lowest potential of the drum motor

driver output transistors. Constant-current

control is implemented by detecting this

voltage.

The current limiter also operates by

detecting this voltage.

Driver start/stop control

High: Motor drives operating state

Low: Standby state (power saving mode)

Power supply

Motor coil center input

The coil voltage waveform is detected

referenced to this voltage.

Coil waveform detection comparator inputs

Each phase output is connected through

an internal 10 kΩ resistor.

Sawtooth waveform generator capacitor

connection

This sawtooth waveform is used for soft

switching in the coil output waveform.

Continued on next page.

No. 6210-5/9

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