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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： | 11/11页 |
| 文件大小： | 269K |
| 代理商： | LB1927 |
LB1927
No.6197-9/11
Description of the LB1927
1. Speed control circuit
The IC performs speed control through combined use of a speed discrimination circuit and PLL circuit. The speed
control circuit counts FG cycles and outputs a deviation signal every 2FG cycles. The PLL circuit outputs a phase
deviation signal every FG cycle.
The FG servo frequency is determined by the following equation. The motor rotation speed is set by the number of
FG pulses and the crystal oscillator frequency.
fFG (servo) = fOSC/8192
fOSC : Crystal oscillator frequency
2. Output drive circuit
In order to reduce power loss at the output, the LB1927 uses the PWM drive technique. While ON, the output
transistors are always saturated, and motor drive power is adjusted by varying the output ON duty ratio. Because
output PWM switching is performed by the lower-side output transistor, a Schottky diode must be connected
between OUT and VCC. (If the reverse recovery time of the diode is too long, a feedthrough current will flow at the
instant when the lower-side transistor goes ON.) An internal diode is provided between OUT and GND. If large
output current causes a problem (waveform distortion during lower-side kickback, etc.), an external rectifying diode
or Schottky diode should be connected.
The output diode is integrated only on the lower side.
3. Current limiting circuit
The current limiting circuit limits the peak current to the value I = VRF/Rf (VRF = 0.5V typ., Rf : current detector
resistance). Current limiting is achieved by reducing the ON duty ratio of the output, which reduces the current.
4. Power save circuit
In order to reduce current drain in the STOP condition, the IC goes into power save mode. In this condition, bias
current to most circuits is cut off, but the 5V regulator output remains active.
5. Reference clock
The reference clock for speed control can be input using one of the following two methods.
(1) Using a crystal oscillator
When a crystal is used for oscillation, connect the crystal, capacitors, and a resistor as shown in the figure below.
R1
C1
VREG
XI
XO
C2
C3
C4
(Reference values)
Oscillator frequency (MHz)
C1 (
F)
C2 (pF)
C3 (pF)
C4 (pF)
R1 (
)
3 to 5
0.1
15
47
10
330k
5 to 8
0.1
10
47
None
330k
8 to 10
0.1
10
22
None
330k
The circuit configuration and values are for reference only. The crystal oscillator’s characteristics as well as the
possibility of floating capacitance and noise due to layout factors must be taken into consideration when
designing an actual application.
C1, R1 : For stable oscillation
C3 : For oscillator coupling
C2 : For stabilization and to prevent oscillation at upper harmonic frequencies
C4 : Prevents oscillation at upper harmonic frequencies
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PDF描述 |
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| LB1927 | BRUSHLESS DC MOTOR CONTROLLER, 2.5 A, PDIP28 |
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| LB8502M | BRUSH DC MOTOR CONTROLLER, 0.003 A, PDSO10 |
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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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