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参数资料
| 型号： | LB1971V |
| 元件分类： | 运动控制电子 |
| 英文描述： | DISK DRIVE MOTOR CONTROLLER, 0.7 A, PDSO24 |
| 封装： | 0.275 INCH, SSOP-24 |
| 文件页数： | 6/8页 |
| 文件大小： | 122K |
| 代理商： | LB1971V |
LB1971V
No.6214-6/8
Continued from preceding page.
Pin No.
Pin name
Pin voltage
Function
Equivalent circuit
17
OSC
Connection for the triangular waveform
oscillator capacitor. This waveform is used to
generate the forcible motor startup waveform
during motor startup.
Connect a capacitor and a resistor between this
pin and ground.
Capacitance required depends on the
characteristics of motor.
Use a capacitor so that the time interval until
when the motor rotation reaches the desired
speed becomes the shortest.
VCC1
17
1k
18
20
19
WIN
UIN
VIN
Inputs to the motor back EMF detection
comparator.
These pins are connected to the output pins via
a resistor internally in the IC.
When defective trouble for start etc. is found,
Connect capacitors between these IN pins to
FCOM.
21
FCOM
Motor coil midpoint input.
The back EMF output is detected by referring to
these voltages.
VCC1
200
20
19
18
1
2
23
10k
200
21
Notes on the LB1971V and External Components
1. Three-phase full-wave sensorless drive
The LB1971V is a 3-phase full-wave sensorless motor driver that provides a reverse torque braking function and is
appropriate for CD and MD players spindle motor drive. Furthermore, since this driver does not require the use of
Hall-effect devices, it can contribute to miniaturization, thinner form factors, and lower power in the motor system.
2. Power supply
This IC uses 3 power supply systems: VS, VCC1, and VCC2. VS is connected to the motor drive transistors, and allows
motor speed control to be implemented by connecting a power supply that varies according to the speed control.
Since VCC2 is connected to the pre-drive circuit and the position detection comparator circuit, the SOURCE pin output
can be made to have a low saturation voltage and a highly efficient motor operation can be achieved by maintaining the
condition that VS ≤ VCC2 1V. Also note that while this IC can be operated from voltages as low as VCC1 = VCC2 =
2V, the common-mode input voltage range of the position detector becomes quite narrow at this low voltage, and care
is required with respect to the applied VS voltage.
Capacitors with an adequate capacitance for stability must be inserted between each of the power supplies and ground.
3. Soft switching drive
This IC adopts a soft switching drive technique to minimize motor noise. When the output transistors switch between
phases, a two-phase excitation state is created, and the output current is switched gradually to suppress motor noise.
The two-phase excitation state is determined by the amplitude of the CSLP pin waveform, and that waveform
amplitude is determined by the value of the capacitor connected at the CSLP pin and the motor speed. Note that while
the soft switching operation increases as the amplitude of the CSLP pin voltage decreases, drive efficiency is reduced
and timing problems may occur if this amplitude becomes too small. Therefore, the CSLP pin amplitude should be at
least 200mVp-p at the maximum motor speed.
4. Position detection comparator circuit
The position detection comparator circuit uses the back EMF generated during motor rotation to detect the position of
the rotor. The position information acquired by this circuit is used to determine to which sections of the output block
power will be applied. Problems that occur during startup due to noise in the VS line can be prevented by inserting
capacitors between the FCOM pin and the UIN, VIN, and WIN pins. However, the timing with which power is applied
during high-speed motor operation may be delayed and efficiency reduced if these capacitors are too large.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LB1973JA | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Monolithic Digital IC Two-channel H-Bridge Driver |
| LB1973JA-AH | 功能描述:马达/运动/点火控制器和驱动器 2-ch H-bridge Step Motor Driver IC 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 |
| LB1973JAGEVB | 功能描述:电源管理IC开发工具 EVM FOR LB1973JA 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 |
| LB1973JA-ZH | 功能描述:马达/运动/点火控制器和驱动器 GP DC 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 |
| LB1973M | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Two-channel H-Bridge Driver |
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