LB11873 Datasheet, PDF (7/14 Pages) Sanyo Semicon Device – Monolithic Digital IC For Polygonal Mirror Motors Three-Phase Brushless Motor Driver

Pin Functions
Pin No.
2
1
35
Pin
OUT1
OUT2
OUT3
Description
Motor drive outputs
33
GND2 Output block ground
LB11873
VCC
Equivalent Circuit
300Ω
VM
28
28
VM
Motor drive output power supply and output current
detection
Connect a resistor (Rf) between this pin and VCC.
The output current will be limited to the value IOUT
= VRF/Rf.
8
IN1+
Hall sensor inputs
9
IN1-
"H" is the state where IN+ > IN-, and "L" is the
VREG
6
IN2+
reverse state.
7
IN2-
It is desirable that the Hall sensor signals have an
4
IN3+
amplitude greater than 50 mVpp
300Ω
5
IN3-
If noise on the Hall sensor signals is a problem,
579
connect capacitors between the IN+ and IN- inputs.
1 2 35
33
300Ω
468
10
HB
Hall sensor element bias current
This circuit is turned off in stop mode.
VREG
10
11
GND1 Control circuit block ground
12
PWM
Sets the PWM oscillator frequency.
VREG
Connect a capacitor between this pin and ground.
A 680pF capacitor sets the oscillator frequency to
be about 34kHz.
200Ω
12
2kΩ
Continued on next page.
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