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參數(shù)資料
| 型號(hào)： | LB1971V |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Three-Phase Full-Wave Sensorless CD and MD Players Spindle Motor Driver |
| 中文描述： | 三相全波傳感器的CD和MD機(jī)主軸電機(jī)驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 5/9頁(yè) |
| 文件大?。?/td> | 82K |
| 代理商： | LB1971V |
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: V
S
, V
CC
1, and V
CC
2. V
S
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 V
CC
2 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 V
S
≤
V
CC
2 – 1 V. Also note that while this IC can be operated from voltages as low as
V
CC
1 = V
CC
2 = 2 V, 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 V
S
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 200 mVp-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.
5. Startup oscillator circuit (OSC pin)
This oscillator circuit creates the commutation logic timing required to start a sensorless motor.
A capacitor and a resistor are connected in parallel to ground. Use a high resistance of about 1.5 M
for this resistor.
The value of the capacitor depends on the characteristics of the motor: select a value such that the time required to
reach the target speed is minimum and the variation in the startup time is as small as possible. If the capacitance is too
large, the variations in startup time will increase, and if it is too small the motor may be prevented from starting up
normally.
6. CX oscillator circuit
This oscillator circuit creates the reference clock used for the sensorless motor logic system. Insert a capacitor to
ground. The oscillator frequency increases as the capacitance decreases. The oscillator frequency must be less than 60
Hz. (The recommended capacitance is 470 pF.)
7. FG output circuit
The FG output is created from the position detection information acquired from the back EMF waveform. This output
has a frequency three times that of the switching frequency. The output circuit is an open collector circuit. The output
is pulled up with a resistor.
No. 6214-5/9
LB1971V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LB1973JA | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Monolithic Digital IC Two-channel H-Bridge Driver |
| LB1973JA-AH | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 2-ch H-bridge Step Motor Driver IC 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| LB1973JAGEVB | 功能描述:電源管理IC開發(fā)工具 EVM FOR LB1973JA RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LB1973JA-ZH | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)器 GP DC MOTOR DRIVER 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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| LB1973M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Two-channel H-Bridge Driver |
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