
No. 6067-6/17
LB1923M
Pin Functions
Pin
Pin No.
Function
IN1+, IN1–
IN2+, IN2–
IN3+, IN3–
19, 20
21, 22
23, 24
Hall inputs for the phases
The logic high level corresponds to the state V
IN+
> V
IN–
.
UH
VH
WH
27
29
31
Outputs. These are fixed-current source outputs.
UL
VL
WL
26
28
30
The duty is controlled by the output pin PWM.
These are open collector sink outputs.
V
CC
V
REG
32
A capacitor must be inserted between this pin and ground to prevent noise entering the circuit.
33
7-V shunt regulator output
GND
16 to 18
38 to 40
Ground
CR
34
Used to set the PWM circuit oscillator frequency.
Motor lock protection circuit. Reference signal oscillator connection. Used by the circuit that prevents incorrect
operation if the clock line is disconnected.
A capacitor must be inserted between this pin and ground.
CROCK
35
R
36
VCO circuit. This pin sets the charge and discharge current. A resistor must be inserted between this pin and ground.
C
37
VCO oscillator connection. A capacitor must be inserted between this pin and ground. Select a value for that capacitor
such that the C pin oscillator frequency does not exceed 1 MHz.
FIL
I
FIL
O
D
OUT
R
OUT
42
Inverting input to the VCO filter amplifier. This pin is connected to the VCO PLL through an (IC internal) 10-kW resistor.
41
VCO filter amplifier output. This pin is connected to the VCO circuit internally.
3
Speed discriminator output. A low level is output when the motor is over speed.
4
PLL circuit output. Outputs the result of the phase comparison between 1/2fCLK and 1/2fFG.
LD
5
Lock detection output. This is an open collector output.
This pin outputs a low level when the motor speed is within the locked range (±6.25%).
INT
REF
INT
IN
INT
OUT
43
Integrating amplifier noninverting input (the 1/2 V
CC
potential)
Integrating amplifier inverting input
2
1
Integrating amplifier output
TOC
44
Torque command input. Normally, this pin is connected to the INTOUT pin. Lowering the TOC pin potential increases
the torque by changing the PWM signal duty for the UL, VL, and WL outputs.
FGIN+
FGIN–
15
FG amplifier noninverting input (the 1/2 V
CC
potential). A capacitor must be inserted between this pin and ground.
FG amplifier inverting input
14
FG
OUT
FGS
OUT
13
FG amplifier output
12
FG amplifier (post-Schmitt) output. This is an open collector output.
RF
25
Output current detection. A resistor must be inserted between this pin and ground.
This resistor sets the maximum output current I
OUT
to be 0.5/Rf.
Start/stop control input. Apply a low level for start, and either a high level or an open (high-impedance) state for start.
S/S
9
F/R
7
Forward/reverse control input. Apply a low level for forward, and either a high level or an open (high-impedance) state
for reverse.
BR
6
Braking control input (short braking operation). Apply a low level for start, and either a high level or an open (high-
impedance) state to brake the motor.
CLK
8
External clock signal input. 10 kHz max.
N1
10
Speed discriminator count value selection inputs
N2
11