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參數(shù)資料
| 型號(hào)： | LB1921 |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 3.5 A, PDIP28 |
| 封裝： | HEAT SINK, SDIP-28 |
| 文件頁(yè)數(shù)： | 7/11頁(yè) |
| 文件大小： | 172K |
| 代理商： | LB1921 |
LB1921
No.5439-5/11
Pin Functions
Pin No.
Symbol
Function
1
5V
5V power supply.
2
7V
7V power supply.
3
VCC
Power supply for all blocks other than the output block.
4
5
FGIN+
FGIN-
FG pulse input (4V power supply).
FG pulse input.
6
FGOUT
FG amplifier output.
7
CR
PWM oscillator frequency setting.
8
OUT1
Output 1.
9
OUT2
Output 2.
10
OUT3
Output 3.
11
GND2
Output block ground.
12
F/R
Forward/reverse control.
Low : forward, high : reverse
13
S/S
Start/stop control.
Low : start, high : stop
14
VM
Used both as the power supply for the output block and as output current detection. The output current can be
converted to a voltage and detected by inserting the resistor Rf between this pin and VCC.
20, 19
18, 17
16, 15
IN1+, IN1-
IN2+, IN2-
IN3+, IN3-
Hall input for OUT1.
Hall input for OUT2.
Hall input for OUT3.
21
Xtal
Crystal oscillator connection. Connect a crystal oscillator element to this pin.
22
GND1
Ground for all blocks other than the output block.
23
LD
Lock detector.
This pin goes low when the motor speed is within the lock range (
±6.25%).
24
DOUT
Speed discriminator output.
Over speed
→ high
25
INTIN
Integrator input.
26
INTOUT
Integrator output (speed control).
27
POUT
PLL output.
28
FGSOUT
FG amplifier output (after the Schmitt trigger circuit).
Truth Table
F/R = low
R/R = high
Source
→ Sink
IN1
IN2
IN3
IN1
IN2
IN3
1
OUT3
→ OUT2
H
L
H
2
OUT3
→ OUT1
H
L
H
3
OUT2
→ OUT1
H
L
H
L
H
L
4
OUT2
→ OUT3
L
H
L
5
OUT1
→ OUT3
L
H
L
6
OUT1
→ OUT2
L
H
L
H
L
Η
Note : Input high refers to the state where IN+
> IN-.
The formula below gives the relationship between the oscillator frequency (fOSC) and the FG frequency (fFC).
fFC (servo) = fOSC/(ECL divisor (16)×number of counts)
= fOSC/8192
Crystal Oscillator External Circuit
External Circuit Constants (reference values)
Xtal (MHz)
C1 (pF)
C2 (pF)
R (k
)
3 to 4
39
82
0.82
4 to 5
39
82
1.0
5 to 7
39
47
1.5
7 to 10
39
27
2.0
Note : The crystal used must have a fundamental frequency fo impedance to 3fo
impedance ratio of 1 : 5 or greater.
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