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参数资料
| 型号： | LV8713T |
| 厂商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 1 A, PDSO24 |
| 封装： | 0.225 INCH, TSSOP-24 |
| 文件页数： | 2/16页 |
| 文件大小： | 304K |
| 代理商： | LV8713T |
LV8713T
No.A1918-10/16
(8) Forward/reverse switching function
FR
Operating mode
Low
Clockwise (CW)
High
Counter-clockwise (CCW)
The internal D/A converter proceeds by one bit at the rising edge of the input STEP pulse.
In addition, CW and CCW mode are switched by setting the FR pin.
In CW mode, the channel 2 current phase is delayed by 90° relative to the channel 1 current.
In CCW mode, the channel 2 current phase is advanced by 90° relative to the channel 1 current.
(9) Setting constant-current control
The setting of STM driver's constant current control is decided the VREF voltage from the resistance connected
between RNF and GND by the following expression.
IOUT = (VREF/5)/RNF resistance
* The above setting is the output current at 100% of each excitation mode.
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.
Attenuation function for VREF input voltage
ATT1
ATT2
Current setting reference voltage attenuation ratio
Low
100%
High
Low
80%
Low
High
60%
High
40%
The formula used to calculate the output current when using the function for attenuating the VREF input voltage is
given below.
IOUT = (VREF/5) × (attenuation ratio)/RNF resistance
Example : At VREF of 1.0V, a reference voltage setting of 100% [(ATT1, ATT2) = (L, L)] and an RNF resistance of
0.5
Ω, the output current is set as shown below.
IOUT = 1.0V/5 × 100%/0.5Ω = 400mA
If, in this state, (ATT1, ATT2) is set to (H, H), IOUT will be as follows :
IOUT = 400mA × 40% = 160mA
In this way, the output current is attenuated when the motor holding current is supplied so that power can
be conserved.
FR
CW mode
CCW mode
STEP
Excitation position
1ch output
2ch output
(1)
(2)
(3)
(4)
(5)
(6)
(5)
(4)
(3)
(4)
(5)
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相关代理商/技术参数 |
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