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参数资料
| 型号： | LV8711T |
| 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： | 10/12页 |
| 文件大小： | 394K |
| 代理商： | LV8711T |
LV8711T
No.A1685-7/12
Input pin function
(1) Chip enable function
Standby mode / operating mode of the IC are switched by setting the PS pin. In the standby-state, the IC enters a
power saving mode and all logic is reset. In the standby-state, internal regulator circuit is not operative.
PS
Condition
Internal regulator
Low or Open
Standby mode
Standby
High
Operating mode
Operating
(2) STM output control logic
Parallel input
Output
IN1A(2A)
IN1B(2B)
OUT1A(2A)
OUT1B(2B)
Current direction
Low
OFF
Output OFF
High
Low
High
Low
OUTA to OUTB
Low
High
Low
High
OUTB to OUTA
High
Low
Brake(DCM mode)
(3) Constant-current setting
The constant-current control setting consist of the VREF voltage setting and resistor (RNF) connected between RNF
and ground. The current is set according to the following equation.
IOUT [A] = VREF [V] / 5 / RNF []
Also, the voltage applied to the VREF pin can be switched to four stages settings by the state of two inputs of the
ATT1 and ATT2 pins. This function is effective for power saving when the motor holding current is applied.
Attenuation function of the VREF input voltage
ATT1
ATT2
Current setting reference voltage attenuation ratio
Low
100%
High
Low
80%
Low
High
50%
High
20%
The output current calculation method for using of attenuation function of the VREF input voltage is as below.
IOUT = (VREF / 5) х Attenuation ratio / RNF resistance
e.g. When the VREF is 1.0V and the set reference voltage is 100% [(ATT1, ATT2) = (Low, Low)] and the RNF
resistance is 0.47, the following output current is set.
IOUT = 1.0V / 5 х 100% / 0.47 = 425mA
In this conditions, when (ATT1, ATT2) is set to (High, High),
IOUT = 425mA х 20% = 85mA
Therefore, the power saving is executable by attenuation of the output current when motor holding current is
supplied.
(4) Setting the chopping frequency
For constant-current control, chopping operation is made with the frequency determined by the external capacitor
(connected to the CHOP pin). The chopping frequency to be set with the capacitor connected to the CHOP pin (pin
10) is as shown below.
Chopping period: Tchop
Tchop ≈ C х V х 2 / I [s]
V: Threshold voltage
Typ, 0.5V
I : Charge / discharge current Typ. 10μA
Chopping frequency: Fchop
Fchop ≈ 1 / Tchop [Hz]
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LV8711T_11 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:PWM Constant-Current Control Stepping Motor Driver |
| LV8711TGEVB | 功能描述:电源管理IC开发工具 EVM FOR LV8711T RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| LV8711TL-MPB-H | 制造商:ON Semiconductor 功能描述:STEPPING MOTOR DRIVER - Ammo Pack |
| LV8711TL-TLM-H | 功能描述:马达/运动/点火控制器和驱动器 RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| LV8711T-MPB-H | 功能描述:马达/运动/点火控制器和驱动器 RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
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