LB1894M 查看數據表（PDF） - SANYO -> Panasonic

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LB1894M

3-Phase Brushless Motor Driver for CD-ROM Spindle Motors

SANYO -> Panasonic 

Pin No. Symbol

Pin voltage

12

CL

0V min

VCC2 max

LB1894M

Equivalent circuit

Function

• When the voltage on Rf pin becomes equal to the

voltage on pin 12 (CL), the current limiter operates.

The pin 12 (CL) voltage is determined externally.

If the current limiter is not used, it should be

connected to VCC2

13

GC

0V min

VCC2 max

18

ROUT

19

VCOUT

22

RIN

20

VCIN

0V min

3.5V max

(VCC2=5V)

• Control input gain switching pin.

35dB is selected when pin 13 (GC) is HIGH (4 to 5),

and 29dB is selected when pin 13 (GC) is LOW (0 to

2V) or open for a value VCC2=5V.

• A resistor connected between this pin and pin 20

(VCIN) enables pin 22 switching between HIGH level

and open to switch the op-amplifier gain.

• Op-amplifier output pin.

This op-amplifier can be used for :

1. Control gain changing, or

2. FG amplifier.

• When this pin goes HIGH, the resistor connected

between pins 18 and 20 is connected in parallel with

the op-amplifier feedback resistor to switch the gain.

• Op-amplifier inverting input pin.

The op-amplifier non-inverting input is connected to

pin 4 VCREF

Continued to next page.

No.4948–6/7

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