- 您现在的位置：买卖IC网 > PDF目录67755 > LB1923M BRUSHLESS DC MOTOR CONTROLLER, 0.03 A, PQFP44 PDF资料下载
参数资料
| 型号： | LB1923M |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.03 A, PQFP44 |
| 封装： | QFP-44 |
| 文件页数： | 3/19页 |
| 文件大小： | 152K |
| 代理商： | LB1923M |
LB1923M
No.6067-11/19
8. Forward/Reverse (F/R) Switching
The F/R pin can be used to switch the motor direction. The direction can be switched with the F/R pin even if the
motor is turning. The IC circuit is designed to compensate for the through currents that occur when the direction is
switched. However, caution is required with respect to increases in the VCC voltage (due to motor current returning
to the power system instantaneously) during direction switching. If this is a problem, try increasing the capacitance
of the capacitor connected between the power supply and ground.
9. Brake Switching
The LB1923M implements a short braking technique in which the upper side transistors (the external transistors)
for all phases are turned on. (The lower side transistors for all phases are turned off.) This means that the output
current during braking does not pass through the Rf (the current detection resistor) and therefore that the current
limiter does not function. Thus caution is required. During braking, the upper side transistors operate at a 100%
duty, regardless of the motor speed. The braking function can be operated and released in the start state. Thus motor
start and stop control can be performed from the brake pin with the S/S pin at the low level, i.e., with the system in
the start state. If the startup time is a problem, the motor can be started with a shorter startup time by using the brake
pin for motor start/stop control than it can with the S/S pin. (This is because the stop state is a power saving state,
and restarting from this state requires waiting the time required for the VCO circuit to stabilize.)
10. Constraint Protection Circuit
The LB1923M includes an on-chip constraint protection circuit to protect the IC and the motor in motor constraint
mode. If the LD output remains high (indicating the locked state) for a fixed period in the start state, the upper side
(external) transistors are turned off. This time is set by the capacitance of the capacitor attached to the CROCK pin.
A time of a few seconds can be set with a capacitance of under 0.1
F.
<Set time (s)>
≈ 44 × C (F)
To release the constraint protection state, the LB1923M must be set to either the stop state or the brake state, or
power must be reapplied. The CROCK pin must be connected to ground if the constraint protection circuit is not
used. However, note that the clock disconnection protection circuit described later cannot be used in this case.
11. Clock Disconnection Protection Circuit
If clock input stops with the LB1923M in the start state, this protection circuit operates and turns off the (external)
upper side output transistors. If the clock is reapplied, the IC resumes operation.
12. Low-Voltage Protection Circuit
The LB1923M includes a low-voltage protection circuit to protect against incorrect operation when power is first
applied or if the power-supply voltage (VCC) falls. The (external) upper side output transistors are turned off if
VCC falls under about 3.75 volts, and this function is cleared at about 4.0 volts.
13. Power Supply Stabilization
Since this IC is used in applications that draw large output currents, the power-supply line is subject to fluctuations.
Therefore, capacitors with capacitances adequate to stabilize the power-supply voltage must be connected between
the VCC pin and ground. If diodes are inserted in the power-supply line to prevent IC destruction due to reverse
power supply connection, since this makes the power-supply voltage even more subject to fluctuations, even larger
capacitors will be required.
14. Ground Lines
The signal system ground and the output system ground must be separated and a single ground point must be taken
at the connector. Since the output system ground carries large currents, this ground line must be made as short as
possible.
Output system ground ... Ground for Rf and the output diodes
Signal system ground ... Ground for the IC and the IC external components
15. VREG Pin
If a motor drive system is formed from a single power supply, the VREG pin (pin 33) can be used to create the
powersupply voltage (about 6.3V) for this IC. The VREG pin is a shunt regulator and generates a voltage of about 7
volts by passing a current through an external resistor. A stable voltage can be generated by setting the current to
value in the range 1 to 7mA. The external transistors must have current capacities of at least 80mA (to cover the
ICC + Hall bias current + output current <source> requirements) and they must have voltage handling capacities in
excess of the motor power-supply voltage. Since the heat generated by these transistor may be a problem, heat sinks
may be required depending on the packages used. If the IC power-supply voltage (4.4 to 7.0V) is provided from an
external circuit, apply that voltage directly to the VCC pin (pin 32). In that case, the VREG pin must either be left
open or connected to ground.
相关PDF资料 |
PDF描述 |
|---|---|
| LB1946 | STEPPER MOTOR CONTROLLER, 1.75 A, PDFM28 |
| LC5511D | POWER FACTOR CONTROLLER, 18 kHz SWITCHING FREQ-MAX, DIP7 |
| LC5521D | 2.5 A POWER FACTOR CONTROLLER, 18 kHz SWITCHING FREQ-MAX, DIP7 |
| LC72137 | PLL FREQUENCY SYNTHESIZER, 40 MHz, PDIP22 |
| LC72137M | PLL FREQUENCY SYNTHESIZER, 40 MHz, PDSO20 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LB1923M-MPB-E | 制造商:ON Semiconductor 功能描述:3PHASE MOTOR PRE-DRIVER - Trays |
| LB1923M-TLM-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 |
| LB1924 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Power Brushless Motor Driver IC for Office Automation Equipment |
| LB1927 | 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 |
| 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 |
发布紧急采购，3分钟左右您将得到回复。