LB1922 查看數據表（PDF） - SANYO -> Panasonic
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LB1922 Datasheet PDF : 10 Pages
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LB1922
Pin Functions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
20, 19
18, 17
16, 15
21
22
23
24
25
26
27
28
Pin
5V
7V
VCC
FGIN+
FGIN–
FGOUT
CR
OUT1
OUT2
OUT3
GND2
F/R
S/S
VM
IN1+, IN1–
IN2+, IN2–
IN3+, IN3–
X’tal
GND1
LD
DOUT
INTIN
INTOUT
POUT
FGSOUT
Function
5-V power supply.
7-V power supply
Power supply for all blocks other than the output block
FG pulse input (4-V power supply pin)
FG pulse input
FG amplifier output
PWM oscillator frequency setting
Output 1
Output 2
Output 3
Ground for the output block
Forward/reverse control
Forward: low, reverse: high
Start/stop control
Start: low, stop: high
Output block power supply. This pin is also used for output current detection. The output current is converted to a
voltage and detected by inserting a resistor (Rf) between this pin and VCC.
Hall input for OUT1
Hall input for OUT2
Hall input for OUT3
Crystal oscillator. Connect a crystal oscillator to this pin.
Ground for all circuits other than the output block.
Lock detection
Outputs a low level when the motor speed is within the lock range, i.e. within ±6.25% of the set speed.
Speed discriminator output
Outputs a high level on overspeed.
Integrator input
Integrator output (speed control pin)
PLL output
FG amplifier output (After the Schmitt circuit)
The following formula gives the relationship between the crystal oscillator frequency (fOSC) and the FG frequency fFC.
fFC (servo) = fOSC/(ECL divided by 16 times the number of counts)
= fOSC/8192
External Crystal Oscillator Circuit
External Constants (Provided for reference only.)
Xtal (MHz)
3 to 4
4 to 5
5 to 7
7 to 10
C1 (pF)
39
39
39
39
C2 (pF)
82
82
47
27
R (kΩ)
0.82
1.0
1.5
2.0
However, a crystal with a ratio between the impedance at the crystal
fundamental frequency fo and the impedance at the third harmonic
frequency (3fo) of at least 1:5 must be used.
No. 5679-4/10
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