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参数资料
| 型号： | LB1927 |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 2.5 A, PDIP28 |
| 封装： | HEAT SINK, DIP-28 |
| 文件页数： | 2/11页 |
| 文件大小： | 269K |
| 代理商： | LB1927 |
LB1927
No.6197-10/11
[Precautions for wiring layout design]
Since the crystal oscillator circuit operates at high frequencies, it is susceptible to the influence of floating
capacitance from the circuit board. Wiring should be kept as short as possible and traces should be kept narrow.
When designing the external circuitry, pay special attention to the wiring layout between the oscillator and C3
(C2), to minimize the influence of floating capacitance. The capacitor C4 is quite effective at reducing the
negative resistance (gain) at high frequencies. However, care is required to avoid excessive reduction in the
negative resistance at the fundamental frequency.
(2) External clock input (equivalent to crystal oscillator, several MHz)
When using an external signal source instead of a crystal oscillator, the clock signal should be input from the XI pin
through a resistor of about 5.1k
connected to the pin in series. The XO pin should be left open. Signal input level
Low : 0 to 0.8V
High : 2.5 to 5.0V
6. Speed lock range
The speed clock range is
±6.25% of the rated speed. When the motor rotation is within the lock range, the LD pin
becomes Low (open collector output). When the motor rotation goes out of the lock range, the ON duty ratio of the
motor drive output is varied according to the amount of deviation to bring the rotation back into the lock range.
7. PWM frequency
The PWM frequency is determined by the capacitance connected to the PWM pin.
f PWM ≈ 1/ (14400×C)
PWM frequency in the range 15 to 25kHz is desirable. The ground side of the connected capacitor must be
connected to the GND1 pin with a lead that is as short as possible.
8. Hall input signal
The Hall input requires a signal with an amplitude of at least the hysteresis width (42mV max.). Taking possible
noise influences into consideration, an amplitude of at least 100mV is desirable. If noise during output phase
switching disrupts the output waveform, insert capacitors across the Hall signal inputs (between the + and - inputs),
and position those capacitors as close as possible to the pins.
9. Forward/reverse switching
Forward/reverse switching of motor rotation is carried out with the F/R pin. If this is performed while the motor is
running, the following points must be observed :
Feedthrough current during switching is handled by proper circuit design. However, the VCC voltage rise during
switching (caused by momentary return of motor current to power supply) must not exceed the rated voltage
(30V). If problems occur, the capacitance between VCC and GND must be increased.
If the motor current after switching exceeds the current limiter value, the lower-side transistors go OFF but the
upper-side transistors go into the short brake state, which causes a current flow. The magnitude of the current is
determined by the motor counterelectromotive voltage and the coil resistance. This current may not exceed the
rated current (2.5A). (Forward/reverse switching at high speed therefore is not safe.)
10. Motor restraint protection circuit
To protect the IC and the motor itself when rotation is inhibited, a restraint protection circuit is provided. If the LD
output is High (unlocked) for a certain interval in the start condition, the lower-side transistors are turned off. The
length of the interval is determined by the capacitance at the CSD pin. A capacitance of 10
F results in a set
interval of about 3.3 seconds. (Tolerance approx.
±30%)
Set interval (s) ≈ 0.33×C (
F)
If the capacitor arrangement is subject to leak current, possible adverse effects such as setting time tolerances must
be taken into consideration.
When the restraint protection circuit has been activated, the condition can only be canceled by setting the system to
the stop condition or by turning the power off and on again (in the stop condition). When wishing not to use the
restraint protection circuit, connect the CSD pin to ground.
If the stop time when releasing the restraint protection is short, the capacitor charge will not be fully dissipated.
This in turn will cause a shorter restraint protection activation time after the motor has been restarted. The stop time
should therefore be designed to be sufficiently long, using the equation shown below (also when restarting in the
motor start transient state).
Stop time (ms)
≥ 15×C (F)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LB1927-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 |
| LB1928 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Three-Phase Brushless Motor Driver for Office Automation Equipment - Prel |
| LB1928_08 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:For Office Automation Equipment 3-phase Brushless Motor Driver |
| LB1928-E | 功能描述:马达/运动/点火控制器和驱动器 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 |
| LB1929 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Three-Phase Brushless Motor Driver for OA Products |
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