lb1989 Sanyo Semiconductor Corporation, lb1989 Datasheet - Page 5

• Manufacturer Part Number: lb1989
• Description: Three-phase Sensorless Vcr Drum Motor Driver
• Manufacturer: Sanyo Semiconductor Corporation

Pin Functions
Pin No.
27
26
26
10
11
12
1
2
7
5
8
9
MCOM
WOUT
UOUT
VOUT
V
WIN
Pin
UIN
VIN
S/S
RF
C1
C2
CC
Pin voltage
8 to 13.8 V
Equivalent circuit
LB1989
Power supply
Motor coil center input
The coil voltage waveform is detected
referenced to this voltage.
Coil waveform detection comparator inputs
Each phase output is connected through
an internal 10 k resistor.
Sawtooth waveform generator capacitor
connection
This sawtooth waveform is used for soft
switching in the coil output waveform.
Drum motor driver outputs
The lowest potential of the drum motor
driver output transistors. Constant-current
control is implemented by detecting this
voltage.
The current limiter also operates by
detecting this voltage.
Driver start/stop control
High: Motor drives operating state
Low: Standby state (power saving mode)
Function
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