- 您现在的位置：买卖IC网 > PDF目录65795 > LB1939T STEPPER MOTOR CONTROLLER, 0.4 A, PDSO20 PDF资料下载
参数资料
| 型号： | LB1939T |
| 元件分类： | 运动控制电子 |
| 英文描述： | STEPPER MOTOR CONTROLLER, 0.4 A, PDSO20 |
| 封装： | 1.1 MM HEIGHT, TSSOP-20 |
| 文件页数： | 6/7页 |
| 文件大小： | 64K |
| 代理商： | LB1939T |
Notes on Constant Current Control Settings
The LB1939T constant current control circuit has the
structure shown in the figure at the right. The voltage input
to the VC pin is resistor divided internally (by 70 k
and
20 k
resistors) to 1/4.5 and input to the plus (+) input of
the constant current control amplifier as reference.
The minus (–) input of this constant current control
amplifier is connected, through the wire bond resistor Rb
(= 0.1
), to the RFG pin. The constant current control
circuit operates by comparing the voltage generated by the
external current detection resistor connected to the RFG
pin and the reference voltage mentioned above.
Note that the voltage at VA will be that given by the
following formula since the bias current Ib (= 1.5 A)
flows from the constant current control amplifier plus (+)
input during constant current control operation.
VA = VC/4.5 + Ib
× 20 k
= VC/4.5 + 0.03
Therefore, the logical expression for setting the constant
current Iout is as follows.
Iout = VA/(RFB + Rb)
= (VC/4.5 + 0.03) / (RFB + Rb) ......(1)
No. 6194-6/7
LB1939T
Application Circuit Example 3
ENA1
ENA2
IN1
IN2
S-GND
SVDD
Vref
VC1
VC2 RFG1 RFG2
OUT1
OUT2
VDD
CPU
VS2
VS1
OUT3
OUT4
Channel 1 operates in constant voltage control mode: OUT outputs V
DD × 3K/(3K + 6K) × 1.95
Channel 2 operates in constant current control mode: The RFG voltage is controlled so that Vref/4.5 = 0.2 V.
* : FC1 is left open.
FC2
6 k
3 k
LB1939T
VS
RL
RFG
OUT1
OUT2
Rb = 0.1
RFB
Iout
VC
Constant current
control amplifier
Pad
VA
Ib = 1.5
A
70 k
20 k
A13864
相关PDF资料 |
PDF描述 |
|---|---|
| LB1941T | VOICE COIL MOTOR CONTROLLER, 0.6 A, PDSO8 |
| LB1943N | BRUSHLESS DC MOTOR CONTROLLER, 1.6 A, PSIP10 |
| LB1945H | STEPPER MOTOR CONTROLLER, 1 A, PDSO28 |
| LB1947 | STEPPER MOTOR CONTROLLER, 2.25 A, SFM13 |
| LB1964M | BRUSHLESS DC MOTOR CONTROLLER, 0.5 A, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LB1939T_09 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:2 Channel H Bridge Constant Voltage/Constant Current Driver IC |
| LB1939T-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 |
| LB1939T-TLM-E | 功能描述:马达/运动/点火控制器和驱动器 1.6-7.5V Stepping 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 |
| LB1940T | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:2-ch H-Bridge Constant Current Driver |
| LB1940T_06 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:2-ch H-Bridge Constant Current Driver |
发布紧急采购，3分钟左右您将得到回复。