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參數(shù)資料
| 型號： | LV8746V |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 運動控制電子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 1.2 A, PDSO44 |
| 封裝： | 0.275 INCH, SSOP-44 |
| 文件頁數(shù)： | 2/24頁 |
| 文件大?。?/td> | 400K |
| 代理商： | LV8746V |
LV8746V
Description of operation
Input Pin Function
(1) Chip enable function
This IC is switched between standby and operating mode by setting the ST pin. In standby mode, the IC is set to
power-save mode and all logic is reset. In addition, the internal regulator circuit and charge pump circuit do not
operate in standby mode.
ST
Mode
Internal regulator
Charge pump
Low or Open
Standby mode
Standby
High
Operating mode
Operating
(2) Input control method switching pin function
The IC input control method is switched by setting the DM pin. The CLK-IN input control and the parallel input
control can be selected by setting the DM pin.
DM
Input control method
Low or Open
CLK-IN input control
High
Parallel input control
CLK-IN input control (DM = Low or Open)
(1) STEP pin function
Input
ST
STP
Operating mode
Low
*
Standby mode
High
Excitation step proceeds
High
Excitation step is kept
No.A1563-10/24
(2) Excitation mode setting function
Initial position
MD1
MD2
Excitation mode
Channel 1
Channel 2
Low
2 phase excitation
100%
-100%
High
Low
1-2 phase excitation (Full
torque)
100%
0%
Low
High
1-2 phase excitation
100%
0%
High
W1-2 phase excitation
100%
0%
This is the initial position of each excitation mode in the initial state after power-on and when the counter is reset.
(3) Setting constant-current control reference voltage
ATT1
ATT2
Current setting reference voltage
Low
VREF / 5 x 100%
High
Low
VREF / 5 x 67%
Low
High
VREF / 5 x 50%
High
VREF / 5 x 33%
The voltage input to the VREF pin can be switched to four-step settings depending on the statuses of the two inputs, ATT1 and ATT2. This is effective for reducing
power consumption when motor holding current is supplied.
Set current value calculation method.
The reference voltage is set by the voltage applied to the VREF pin and the two inputs ATT1 and ATT2. The output
current (output current at a constant-current drive current ratio of 100%) can be set from this reference voltage and the
RF resistance value.
IOUT = (VREF/5) ×(current attenuation ratio)/ RF resistance
Example : At VREF of 1.5V, a reference voltage setting of 100% [(ATT1, ATT2) = (L, L)] and an RF resistance of
0.5
Ω, the output current is set as shown below.
IOUT = 1.5V/5 × 100%/0.5Ω = 0.6A
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