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參數(shù)資料
| 型號： | LB1923M |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.03 A, PQFP44 |
| 封裝： | QFP-44 |
| 文件頁數(shù)： | 4/19頁 |
| 文件大小： | 152K |
| 代理商： | LB1923M |
LB1923M
No.6067-12/19
16. FG Amplifier
Normally, the FG amplifier is used to construct a filter amplifier such as that shown in the application circuit to
reject noise. Since a Schmitt comparator is connected after the FG amplifier, applications must set the amplification
so that the amplifier output amplitude is at least 250mVp-p. (However, a setting that results in an amplitude of 1 to
3V p-p during steady-state rotation is desirable.) The capacitor connected between the FGIN+ pin (pin 15) and
ground is required for bias voltage stabilization and to generate the initial reset pulse for the internal logic. The reset
pulse is generated in the time it takes for the FGIN+ pin to go from 0 to about 1.3V.
17. Integrating Amplifier
The integrating amplifier integrates the speed error pulses and the phase error pulses and converts them to a speed
command voltage. At the same time it also sets the control loop gain and frequency characteristics using external
components. The integrating amplifier output (pin 1) is normally connected to the TOC pin (pin 44) by an external
line. Separating the integrating amplifier output and the PWM control circuit allows applications to switch the
integrating amplifier constants using an external operational amplifier, analog switch, or other circuit. This is useful
in applications that require integration constant switching due to a wide range of variability in the motor speeds that
must be provided.
18. VCO Filter Amplifier
The VCO filter amplifier converts the VCO system PLL output to the VCO voltage. The amplifier input resistor
(about 10k
) is built in. Therefore, the gain and the frequency characteristics are set by the feedback resistor and the
feedback capacitor. Since the range of frequency variation supported becomes narrower as the gain is reduced, it is
desirable to set the gain of this amplifier to be 1 or higher.
19. Startup Techniques
If the motor is started and stopped repeatedly over a short period, the charge accumulated on the integrating
amplifier’s external capacitor may become a problem. (This can result in abnormal speed overshooting at startup
and other problems.) The circuit shown below can be effective at resolving this problem.
Integrating Amplifier Related External Circuit
–
+
Added circuit
S/Ssignal
A11834
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LB1923M-MPB-E | 制造商:ON Semiconductor 功能描述:3PHASE MOTOR PRE-DRIVER - Trays |
| LB1923M-TLM-E | 功能描述:馬達/運動/點火控制器和驅(qū)動器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| LB1924 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Power Brushless Motor Driver IC for Office Automation Equipment |
| LB1927 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Office Automation Equipment 3-phase Brushless Motor Driver |
| LB1927-E | 功能描述:馬達/運動/點火控制器和驅(qū)動器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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