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参数资料
| 型号： | LB1940U |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 0.4 A, PDSO20 |
| 封装： | 0.225 INCH, MSOP-20 |
| 文件页数： | 6/8页 |
| 文件大小： | 261K |
| 代理商： | LB1940U |
LB1940T/1940U
No.7232-6/8
Application Circuit Diagram
At constant-current control: The OUT current is controlled so that the RFG pin voltage is equal to the VC input pin
voltage.
For example, IOUT = 200mA (= 0.2V/1) when VC = 0.2V and RFB = 1.
*: There is no priority relationship between respective input voltages (ENA, IN) and respective supply voltages
(VDD, VS). For example, operation with VIN = 5V, VDD = 3V, VS = 2V is possible.
Note: The input voltage range to the reference voltage input pin VC for constant-current setting is from 0.19V to
1.0V.
Constant current setting
The composition of the constant-control circuit of this IC is as shown
in the figure below.
The voltage entered in the VC pin is entered as a reference to the “+”
side input of the constant-current control amplifier.
The “-” side of this constant-current control amplifier is connected to
the RFG pin via the wire bonded resistor Rb (= 0.1
).
The constant-current control circuit consists of comparison of the
voltage generated at the external current detection resistor with the
above reference voltage.
In addition, since the bias current Ib (= 1.5A) flows out of the
positive (+) input of the constant current control amplifier during the
constant current control, if the voltage is input to the VC pin by
dividing the VREF voltage by 4.5 according to the dividing resistance
(70k
and 20k) as shown in the figure, the formula for calculating
the VC voltage is as follows :
VC = VREF/4.5+Ib
×20k = VREF/4.5+0.03
Therefore, the theoretical equation to set the constant current IOUT is as follows:
IOUT = VC/(RFB+Rb) = (VREF/4.5+0.03)/(RFB+Rb)
ENA1
ENA2
IN1
IN2
S-GND
SVDD
Vref
VC1
VC2
RFG1
RFG2
OUT1
OUT2
VDD
VS2
VS1
OUT3
OUT4
CPU
FC1
FC2
RfB
Ra
Rb
LB1940T
LB1940U
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LB1940U-MPB-E | 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 |
| LB1940U-TLM-E | 功能描述:马达/运动/点火控制器和驱动器 MOTOR DRIVER 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 |
| LB1941 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Constant Current Forward/Reverse Driver IC for Digital Cameras |
| LB1941GP | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Monolithic Linear IC For Digital Cameras Constant Current Forward/Reverse Driver |
| LB1941GP_10 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:For Digital Cameras Constant Current Forward/Reverse Driver |
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