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| 型号： | LB1825 |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 2 A, PDIP28 |
| 封装： | HEAT SINK, DIP-28 |
| 文件页数： | 9/9页 |
| 文件大小： | 139K |
| 代理商： | LB1825 |
No. 4845-9/9
LB1825
4. Reference signal input circuit
Internal clock mode (crystal oscillator)
The values of the external components associated with the crystal oscillator must be set up according to the
frequency of the oscillator. (See Table 1.) To avoid trouble with the oscillator circuit, confirm the component
values used with the oscillator’s manufacturer.
External clock mode
Use the external circuit shown in Figure 2 to input the clock signal when controlling the motor speed using a
reference signal with the same frequency as FG.
5. Start/stop
When driving motors such as polygon mirror motors, the motor is normally stopped by turning off motor drive and
putting the motor in the free-running state. For this type of motor, set the S/B pin low and attach an external
transistor at FGOUT1 as shown in the Sample Application Circuit (Optical Disk Spindle Motor) figure to start and
stop the drive. (Motor drive is turned off when FGOUT1 is low.)
6. Start/brake
When driving motors such as optical disk spindle motors, stopping is performed by applying some form of braking.
In these applications it is necessary for the motor to decelerate briefly and come to a complete stop. See the Sample
Application Circuit (Optical Disk Spindle Motor) figure for a sample circuit for this case. (The difference between
this circuit and the circuit shown in the Sample Application Circuit (Optical Disk Spindle Motor) figure is the
addition of the capacitor C5 to the S/B pin start/brake circuit.)
Braking Operation
This braking circuit applies full torque reverse rotation braking (in the current limited state) directly after the S/B pin is
set low while the motor is turning. After that, the reverse torque is gradually decreased (according to the time constant
determined by R4 and C5) at the points where the speed falls below the values listed below. This operation brings the
disk to a full stop.
f3H = fFG/32 (FG mode)
f3H = fFG/8 (Triple Hall FG mode)
f3H: Triple Hall input composite frequency.
f3H = fFG/2 (Single Hall FG mode)
fFG: The FG frequency when locked
Depending on the size of the disk and the motor torque the following adjustments may be required to improve the disk
stopping characteristics.
1. Increase the time constant if the motor continues to rotate in the forward direction after the braking torque has gone
to zero.
2. Decrease the time constant if the motor is observed to rotate in the reverse direction due to the braking operation.
3. A value of about 51 k
is recommended for R4. In particular, it should be under 100 k.
This catalog provides information as of August, 1997. Specifications and information herein are subject to
change without notice.
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
s Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.
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| LB1830MC-AH | 功能描述:马达/运动/点火控制器和驱动器 LOW-VOLTAGE 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 |
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