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参数资料
| 型号： | LB1696 |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 2.5 A, PDIP20 |
| 封装： | DIP-20 |
| 文件页数： | 8/9页 |
| 文件大小： | 290K |
| 代理商： | LB1696 |
7-2. Output current neglect time
While the current limiter turns on and the sink side output is off, the regeneration current flows through the external diode
used for absorbing the regeneration current above the output that was turned off. After the output off time elapses and the
sink side output is turned on again, reverse current flows momentarily through the external diode (for the diode’s reverse
recovery time), causing a current that reaches the limiter value to flow momentarily through the output. Because this current
will cause current limiter to turn on again, turning off the output, the average current decreases, causing the torque to be
decreased at motor start-up, etc. Therefore, in order to prevent this current from being detected, the current limiter is designed
so that the output current is not detected for a fixed period of time after the sink side output is turned on again. This length
of time is the output current neglect time. The output current neglect time is determined by the discharge time of the
capacitor C connected to the C pin. When current limiter turns on and C charges to 2 V, C begins discharging, and the output
current neglect time is the time it takes for C to discharge to the point where the voltage at C is 0.4 V (typ). The C discharge
current is a constant current, and is set at about 11 times the ICL1 of charge current when the motor is locked. As a result, the
output current neglect time is about 1/11 of the output off time when the motor is locked. Because the C discharge current is
the same whether the motor is locked or is rotating, the output current neglect time is also the same whether the motor is
locked or is rotating. The C discharge current ICH and the output current neglect time tsm are determined according to the
following equations:
ICH 6 1.4/R1 × 11
tsm 6 C/ICH × 1.6
6 0.10 × R1 × C
Because there is a slope to the time at which the sink side output is turned on again, the reverse current is not very large,
even if a rectifier diode (a diode in which the reverse recovery time is not short) is used as the external diode for absorbing
the regeneration current in the current limiter.
7-3. Output off time setting
It is necessary to set the output off time to a suitable level for the type of motor being used. (The output off time is set by
the external resistors connected to the R1 and R2 pins, and by the external capacitor connected to the C pin.) In the LB1696,
the output off time when the motor is rotating can be set so that it is shorter than when the motor is locked. Set the optimal
output off time for when the motor is locked, and then set the output off time for when the motor is rotating. Fig. 1 shows
the current limiter operation waveform.
(1) When the output off time is set short
The output current neglect time is set by a circuit within the IC to about 1/11 of the output off time when the motor is
locked. Therefore, if the output off time is set to a very short length of time, the output current neglect time may not be
adequate. If the output current neglect time is inadequate, the current limiter will turn on in response to reverse current
from the external diode used to absorb the regeneration current. (Refer to Section 7-2.) Furthermore, if the output off time
is short, the diode reverse current becomes large and ASO must be considered.
(2) When the output off time is set long
If the output off time when the motor is rotating (at motor start-up) is set to a very long length of time, the average
current decreases, causing the torque at motor start-up to drop. Depending on the type of motor, it may be impossible to
shift from the current limiter operation state to the normal rotation state. In current limiter operation when the motor is
locked, it is necessary to set the output time to a comparatively long length of time. Therefore, first set the output off
time toff1 for when the motor is locked, and then set the output off time toff2 for when the motor is rotating so that toff2 is
shorter than toff1.
LB1696
No.5244-8/9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LB1696-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 |
| LB16CGG01 | 功能描述:按钮开关 SPDT ON-ON GRAY ROUND BODY ONLY RoHS:否 制造商:C&K Components 触点形式:2 NC - 2 NO 开关功能:ON ? OFF 电流额定值:4 A 电压额定值 AC:12 V to 250 V 电压额定值 DC:12 V to 50 V 功率额定值: 安装风格:Through Hole 照明:Illuminated 照明颜色:None IP 等级:IP 40 端接类型:Solder 触点电镀:Silver 执行器:Square 盖颜色: 封装: 可燃性等级:UL 94 V-0 |
| LB16CGG01-05-BJ | 制造商:NKK 制造商全称:Nihon Kaiheiki Industry Co. Ltd. 功能描述:Standard Size Pushbuttons |
| LB16CGG01-12-BJ | 制造商:NKK 制造商全称:Nihon Kaiheiki Industry Co. Ltd. 功能描述:Standard Size Pushbuttons |
| LB16CGG01-12-JG | 制造商:NKK Switches 功能描述:STD SIZE PUSHBUTTON/ILLUMINATED/ 制造商:NKK Switches 功能描述:STD SIZE PUSHBUTTON/ILLUMINATED/SNAP-IN |
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