LB1981 datasheet(4/9 Pages) SANYO

4 / 9 page

LB1981V

No. 5917-4/9

Pin Descriptions

Pin number

Pin name

STBY

SEL CSLP

FRC

VCC2

VCC1

CLSP1

CLSP2

Pin voltage

VCC1 max

–0.2V min

VCC1 max

–0.2V min

VCC1 max

–0.2V min

0V to VCC2

2.7V to 10V

2.7V to 6V

Equivalent circuit

Pin function

When this pin is at 0.7V or

less or when it is open, only

the FG/PG amplifier operates.

In the motor drive state, the

pin should be at 2V or higher.

CSLP pin charge/discharge

current switching pin.

Setting this pin to 2V or higher

switches the triangular wave

slope that determines soft

switching.

Motor forward/reverse

switching pin.

Low: reverse

(–0.2V to +0.7V or open)

High: forward

(2V to VCC1)

Power supply pin for

determining output amplitude

by supplying motor voltage.

Must be lower than VCC2

voltage.

Power supply pin for supplying

source side predriver voltage

and coil waveform detect

comparator voltage.

Power supply pin for circuits

except motor voltage, source

side predriver voltage, and coil

waveform detect comparator

voltage.

Pins for connecting triangular

wave oscillator capacitor. This

triangular wave coil output

performs waveform soft

switching.

Continued on next page

100k

Ω

100k

Ω

VCC1

A10858

100k

Ω

100k

Ω

VCC1

A10859

50k

Ω

50k

Ω

VCC1

A10860

µA

µA20µA

µA

Ω

VCC1

A10861

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