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參數(shù)資料
| 型號： | LB1660N |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 2-Phase Unipolar Brushless Motor Drivers |
| 中文描述： | 二相單極無刷電機(jī)驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大小： | 271K |
| 代理商： | LB1660N |
(4) Lock detect threshold voltage
The LB1660 series have the function to stop the output drive after the lapse of a given period of time when a motor is
locked, and period of time can be set by C, R3.
The CR pin peripheral equivalent circuit is shown below. The LB1660 series generate the CR pin discharge pulse when the
phase changes, (detection of rotation). When a motor is locked (very low rotational speed), the C connected to the CR pin
stops discharging and the CR pin voltage rises. When the CR pin voltage exceeds the threshold voltage (V
IN
×
0.8), the
output drive current becomes zero and the output transistor is turned off, and the RD pin output turns from ‘‘L’’ to ‘‘H’’. The
RD pin output is of the open collector type.
CR Pin Peripheral Circuit
[Setting Method of Lock Detect Time]
(1) Generation of discharge pulse
Electric charges on C charged through R3 are discharged via route of C
→
r
→
TRr with constant width pulses at each phase
change. When a fan has a high rotational speed, a lot of discharge pulses are generated and the CR pin voltage (=V
CR
) drops.
By contrast, when a fan has a low rotational speed, V
CR
rises and the protector is operated.
The discharge pulses are generated by two methods as shown below.
1
Generated internally at the time of phase change. The power transistor base storage time is used for discharge pulses.
t = 15 to 30 μsec
2
When the kickback voltage induced by L of a motor coil is absorbed by the zener diode across collector and base of the
output transistor, this interval of time during which the transistor is turned on is used for discharge pulses.
Therefore, the LB1661,1665 or LB1660N, 1664N use external zener diodes and capacitors, discharge occurs with pulses
of
1
only and V
CR
voltage gets higher than the circuit generating discharge pulses of
2
even if the CR time constant
is the same.
Output transistor drive
Discharge pulse
CR pin voltage
RD pin
Motor lock
Output off
0.8
c
V
IN
LB1660N, 1661, 1664N, 1665
No.2551-7/9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LB1662D | DC Fan Motor Drivers |
| LB1663 | 2-Phase Unipolar Brushless Motor Drivers |
| LB1663M | 2-Phase Unipolar Brushless Motor Drivers |
| LB1667 | Two-Phase Unipolar Drive Brushless Motor Drivers |
| LB1667M | Two-Phase Unipolar Drive Brushless Motor Drivers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LB1661 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:2-Phase Unipolar Brushless Motor Drivers |
| LB1662D | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:DC Fan Motor Drivers |
| LB1662M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:DC Fan Motor Drivers |
| LB1663 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:2-Phase Unipolar Brushless Motor Drivers |
| LB1663-E | 功能描述:馬達(dá)/運(yùn)動(dòng)/點(diǎn)火控制器和驅(qū)動(dòng)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(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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