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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： | 7/9页 |
| 文件大小： | 290K |
| 代理商： | LB1696 |
7.
Current limiter
The current limiter turns off the sink side output transistor when the output current-set current value (limiter value) is reached. The
output current is limited by the limit value. The RF pin is used to detect the output current. The output current is detected as
voltage by connecting resistor Rf between RF pin and GND. When the RF pin voltage reaches 0.5 V (typ), the current limiter
operates so that the output current is limited to the 0.5/Rf-set limiter value.
7-1. Output off time
The current limiter is so designed that current limit function turns on to turn off the sink side output transistor and then turn
on the transistor again after off period of a fixed time (output off time) has elapsed. Since the LB1696 uses this output
switching method for the current limiter, the ASO problems when current limitation goes into operated mode as compared
with the output unsaturated current limited one. In addition, by separating current limiter operation into two modes, one when
the motor is locked and one when the motor is rotating (during start-up), it was possible to implement a current limiter circuit
with excellent motor start-up characteristics. The explanation of current limiter operation below is divided into two parts: one
for the mode used when the motor is locked and one for the mode used when the motor is rotating. The output off time
depends on the charge time of capacitor C connected to the C pin. When the current limiter turns on, C begins charging and
the output is kept off until C is charged up to 2 V (typ). When C has been charged up to 2 V, the sink side output turns on
again. The C charging current is a constant-regulated current, which depends on resistor R1 connected to the R1 pin and
resistor R2 connected to the R2 pin. In the LB1696, the charge current can be switched for when the motor is locked and for
when the motor is rotating in order to support motors for a large number of applications. As a result, it is possible to set the
output off time so that it is different for when the motor is locked and for when the motor is rotating. By setting the output
off time so that it is shorter when the motor is rotating (at start-up) as opposed to when the motor is locked, it is possible to
reduce the decrease in torque at start-up caused by the output off time. The charge currents and output off times for when the
motor is locked and for when the motor is rotating are as follows:
(1) Charge current ICL1 and output off time toff1 when the motor is locked
ICL1 6 1.4/R1
toff1 6 C/ICL1 × 2.0
6 1.42 × R1 × C
(R1 must be set between 14 k
Ω and 100 kΩ.)
(2) Charge current ICL2 and output off time toff2 when the motor is rotating
ICL2 6 ICL1 + (1.4/R2)
toff2 6 C/ICL2 × 2.0
6 1.42 × R × C{R=R1 × R2/(R1 + R2)}
(R2 must be set between 7 k
Ω and 100 kΩ.)
LB1696
No.5244-7/9
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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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