LB1876_09 SANYO [Sanyo Semicon Device], LB1876_09 Datasheet - Page 6

• Manufacturer Part Number: LB1876_09
• Description: For Polygon Mirror Motors 3-phase Brushless Motor Driver
• Manufacturer: SANYO [Sanyo Semicon Device]

Pin Function
Pin No.
36
34
28
29
35
10
11
12
13
14
15
2
1
3
8
9
6
7
4
5
OUT1
OUT2
OUT3
GND3
VM1
VM2
NC
NC
IN1 +
IN1 −
IN2 +
IN2 −
IN3 +
IN3 −
FGIN +
FGIN −
GND1
GND2
PWM
FC
Pin name
Motor drive output pins.
PWM controls duty cycle ratio by lower transistors.
Connect Schottky diodes between the outputs and V CC .
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
V CC .
The output current is limited to the current value set by I OUT
= V REF /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.
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.
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.
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.
Function
LB1876
4 6 8
V CC
VREG
VREG
10
VREG
VREG
300Ω
300Ω
Equivalent curcuit
300Ω
200Ω
2kΩ
VM2
VM1
Continued on next page.
300Ω
300Ω
300Ω
29
28
34
1 2 36
No.6201-6/12
14
15
11
5 7 9