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参数资料
| 型号： | LB11876 |
| 厂商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.03 A, PDSO36 |
| 封装： | 0.275 INCH, SSOP-36 |
| 文件页数： | 5/15页 |
| 文件大小： | 168K |
| 代理商： | LB11876 |
LB11876
No.8317-13/15
LB11876 Overview
1. Speed control circuit
Since the LB11876 adopts PLL speed control, it provides precise, low-jitter, and stable motor operation. This PLL
circuit compares the falling edge of the CLK signal with the FG signal (the falling edges of the FGIN+ or FGS output)
and controls motor operation based on the difference.
The FG servo frequency during this control operation is controlled by the frequency given by the following formula
which is based on the divisor selected by the clock input frequency (fCLK) and the CLKSEL pin.
fFG (servo) = fCLK ÷ <divisor>
2. Output drive circuit
To minimize the power loss in the output, the LB11876 adopts direct PWM drive. The output transistors, which are
external, are always saturated when on and the motor drive power is adjusted by changing the duty with which the
output is on.
The PWM switching is performed with the UH, VH, and WH outputs. Either high side or low side switching can be
selected by the way the output transistors are connected.
3. Current limiter circuit
The current limiter circuit limits the drive current to a current determined by the equation I = VRF/RF, where VRF =
0.25V (typical) and Rf is the current detection resistor. The limiting operation works by reducing other output on duty
to suppress the drive current.
Detection with excellent precision can be acquired by connecting the RF and RFGND pin lines to points as close as
possible to the ends of the current detection resistor (Rf).
4. Reference clock
Care must be taken to assure that no noise due to chattering or other problems appears on the externally input clock
signal. While the input circuit is designed with hysteresis, noise must be rejected by, for example, inserting capacitors
in the clock line if noise problems occur.
If the application is to be started in the state where there is no reference clock input signal, the motor will turn
somewhat and then drive will be turned off.
5. PWM frequency
The PWM frequency is determined by the capacitance of the capacitor (C) connected to the PWM pin.
fPWM ≈ 1/(30000 × C)
If a 620pF capacitor is used, the circuit will oscillate at about 50kHz. If the PWM frequency is too low the motor will
emit switching noise, and if it is too high the power loss in the output will increase. A frequency in the range 30kHz to
100kHz is desirable. This capacitor must be connected between this pin and the GND pin by lines that are as short as
possible to make this circuit immune to noise.
6. Hall sensor input signals
To prevent noise problems, the Hall sensor input signals should have an amplitude of at least 100mV. If the output
waveforms (during phase switching) are disrupted by noise, this must be prevented by connecting capacitors across the
inputs.
If the outputs from a Hall sensor IC are input, holding one side of the inputs (either the + or - side) at a voltage within
the common-mode input range for direct Hall sensor signal input will allow the other side to be used as 0V to VCC
input.
7. FG input signal
Normally, one of the Hall sensor signals is used as the FG input signal. if noise is a problem, the input signal must be
filtered with a capacitor or a capacitor plus resistor.
相关PDF资料 |
PDF描述 |
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| LB11889M | BRUSHLESS DC MOTOR CONTROLLER, 1.3 A, PDSO36 |
| LB11946 | STEPPER MOTOR CONTROLLER, 1.2 A, PDIP28 |
| LB11946 | STEPPER MOTOR CONTROLLER, 1.2 A, PDIP28 |
| LB11980H | BRUSHLESS DC MOTOR CONTROLLER, 1.3 A, PDSO28 |
| LB11980H | BRUSHLESS DC MOTOR CONTROLLER, 1.3 A, PDSO28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LB11876-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 |
| LB11876-TLM-E | 功能描述:马达/运动/点火控制器和驱动器 PRINTER 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 |
| LB-1188 | 制造商:Ideal Industries Inc 功能描述:GRIPPER-SET C/STMLT .109/GRTPD |
| LB11880 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Three-Phase Sensorless Motor Driver with Loading Motor Driver |
| LB11885N | 制造商:SANYO Semiconductor Co Ltd 功能描述:Vcr Deck 3 In 1 Motor Driver Sanyo IC 48-Pin op-Hs SMD |
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