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参数资料
| 型号： | LV8731V |
| 厂商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 2.5 A, PDSO44 |
| 封装： | 0.275 INCH, SSOP-44 |
| 文件页数： | 11/26页 |
| 文件大小： | 323K |
| 代理商： | LV8731V |
LV8731V
(4) Current limit reference voltage setting function
By setting a current limit, this IC automatically exercises short braking control to ensure that when the motor current
has reached this limit, the current will not exceed it.
(Current limit control time chart)
CHARGE
fchop
Forced CHARGE
section
Coil current
Set current
Current mode
SLOW
Current mode
The limit current is set as calculated on the basis of the voltage input to the VREF pin and the resistance between the
RF pin and GND using the formula given below.
Ilimit = (VREF/5) /RF resistance
The voltage applied to the VREF pin can be switched to any of the four setting levels depending on the statuses of the
two inputs, ATT1 and ATT2.
Function for attenuating VREF input voltage
ATT1
ATT2
Current setting reference voltage attenuation ratio
Low
100%
High
Low
80%
Low
High
50%
High
20%
The formula used to calculate the output current when using the function for attenuating the VREF input voltage is
given below.
Ilimit = (VREF/5) × (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
0.3
Ω, the output current is set as shown below.
Ilimit = 1.5V/5 × 100%/0.3
Ω = 1.0A
If, in this state, (ATT1, ATT2) has been set to (H, H), Ilimit will be as follows :
Ilimit = 1.0A × 20% = 200mA
No.A1482-19/26
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