LB11981 Datasheet, PDF (3/7 Pages) Sanyo Semicon Device – Three-Phase Sensorless Motor Driver

LB11981
Pin Functions
Pin No.
1
2
3
4
5
6
7
8
9
10
11, 12, 14
13
15
16
17
18
19
20
21
22
23
24
25
26, 27
28
Pin
VCOIN
CX
LKC
LAT
INFR
LKO
GND
BFGO
R_FS
R_F
N.C
U_OUT
V_OUT
W_OUT
N.C
MCOM
FC
V_CCM
U_IN
V_IN
W_IN
V_CC
V_REG
TEST
PC_OUT
Function
VCO circuit voltage input. Inputs the PCOUT pin voltage filtered by an RC circuit.
The value of the capacitor between this pin and ground determines the operating frequency range and the minimum operating
frequency of the VCO circuit.
Connection for the lock detection circuit capacitor. The value of the capacitor between this pin and ground determines the lock
state monitoring period. The lock detection circuit can be disabled by connecting this pin to ground.
Lock detection circuit mode switching input
Forward/reverse switching input
Lock state detection signal. (A pull-up resistor is required.)
Ground
Motor back electromotive force detection FG output (3 phases combined). (A pull-up resistor is required.)
Current limit sensing. The output current can be detected and current limiting applied by connecting this pin to the RF pin.
Lowest potential of the motor driver output transistor. The value of the resistor between this pin and ground determines the
current that flows in the output transistor.
Not connected
Motor driver output
Not connected
Motor coil midpoint input. The coil voltage waveform is detected using this voltage as the reference level.
Frequency characteristics correction. Closed loop oscillation in the current control system can be stopped by inserting a
capacitor between this pin and ground.
Motor drive output stage power supply
Coil waveform detection comparator input
These are connected to the outputs for each phase through internal 10 kΩ resistors.
Power supply
Internal 5 V regulator output
Test pin. This pin must be left open during normal operation.
V_CO circuit PLL output
No. 6656-3/7