LB1876-MPB-E 查看數據表（PDF） - ON Semiconductor

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LB1876-MPB-E

Monolithic Digital IC For Polygon Mirror Motors 3-phase Brushless Motor Driver

ON Semiconductor 

Pin Function

Pin No. Pin name

2

OUT1

1

OUT2

36 OUT3

LB1876

Function

Motor drive output pins.

PWM controls duty cycle ratio by lower transistors.

Connect Schottky diodes between the outputs and VCC.

34 GND3

28 VM1

29 VM2

3

NC

35 NC

8

IN1+

9

IN1−

6

IN2+

7

IN2−

4

IN3+

5

IN3−

Output block ground.

Output block power supply and output current detection.

VM1 and VM2 are short-circuited and used.

Connect low-resistance resistors Rf between these pins and

VCC.

The output current is limited to the current value set by IOUT

= VREF/Rf.

Since these are not connected internally, they can be used

for wiring.

Hall device input pins.

These inputs return a high level when IN+ > IN− and a low

level when IN− > IN+.

A Hall signal amplitude of at least 100mVp-p (differential) is

desirable. Insert a capacitor between IN+ and IN− if noise on

the Hall signal is a problem.

VCC

Equivalent curcuit

300Ω

VM2

29

VM1 28

1 2 36

34

VREG

300Ω

468

300Ω

579

10

FGIN+

11

FGIN−

FG comparator input pins.

If noise on the FG signal is a problem, insert either a

capacitor or a filter consisting of a capacitor and a resistor.

VREG

300Ω

10

300Ω

11

12 GND1

13 GND2

14 PWM

Control circuit block ground.

Sub-ground.

PWM oscillation frequency setting pin.

Connect a capacitor between this pin and ground.

A capacitance of 1800pF for C sets the frequency to

approximately 37kHz.

VREG

15 FC

Current control circuit frequency characteristics

compensation pin.

Insert a capacitor (on the order of 0.01 to 0.1μF) between

this pin and ground.

The output duty is determined by the ratio of the voltage on

this pin and the PWM oscillator waveform.

VREG

200Ω

14

2kΩ

300Ω

15

Continued on next page.

No.6201-6/12

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