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参数资料
| 型号： | LB1695 |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 2 A, PDIP30 |
| 封装： | 0.400 INCH, DIP-30 |
| 文件页数： | 7/9页 |
| 文件大小： | 153K |
| 代理商： | LB1695 |
LB1695
No.5678-7/9
6. Power supply stabilization capacitor
The low-voltage protection circuit may operate or other problems may occur if large fluctuations occur in the VCC line
voltage. The VCC line must be stabilized by a capacitor (of a few F) inserted between VCC and ground. Also, the
large switching currents that flow in the VM line can cause fluctuations in the IC VM voltage due to inductive
components in the circuit wiring. The VM line must also be stabilized by a capacitor inserted between VM and ground
to prevent fluctuations in the ground line potential, incorrect operation, and voltages that exceed the voltage handling
capacity of the IC. In particular, applications that have long circuit lines for VM, VCC, and ground must have adequate
stabilization capacitors inserted in the power lines.
7. Current limiter circuit
The current limiter circuit turns off the sink side output transistors when the output current reaches the set limit value
(the limit current). The RF pin is used for current detection, and the output current is detected as a voltage by inserting
the resistor Rf between the RF pin and ground. The current limiter circuit operates when the RF pin reaches 0.5V
(typical), and thus the output current is limited to the current limit set by the term 0.5/Rf.
7.1 Output off time
After the current limiter circuit operates and turns off the sink side output transistors, it then turns the output on
again after a fixed period (the output off time) has elapsed. This current limiter circuit output switching technique
adopted in the LB1695 is much less susceptible to problems with ASO than are output limitation techniques in
which the output is not operated at the saturated level. The output off time it determined by the charge time for the
capacitor connected to the C pin. When the current limiter circuit operates, the C pin capacitor begins to charge, and
the time required to charge this capacitor to the C voltage, which is 2V (typical), is the output off time. When the
capacitor is charged to the C voltage of 2V, the sink side output transistors are turned on again. The C pin charge
current is a fixed current determined by the resistor R connected to the R pin. The capacitor charge current ICL and
the output off time toff are related as follows.
ICL ≈ 1.3/R (R must be set to a value in the range 13 to 100k)
toff ≈ C/ICL × 2.0
≈ 1.53 × R × C
7.2 Output current ignored time
While the current limiter circuit is operating and the sink side output is off, a regenerative current flows in the
external diode provided to absorb regenerative currents in the upper side of the output circuit that was turned off.
When the sink side output is turned off after the output off time has elapsed, a reverse current flows instantaneously
in this diode due to the diode’s reverse recovery time. Due to this phenomenon, a current that may reach the current
limit value flows instantaneously in the output. If the current limiter operated again due to this current, the output
would be turned off and the average current level would fall. This could result in significantly lower torque during,
for example, motor startup. Therefore, to prevent this current from being detected, the current limiter circuit also
provides a fixed period (the output current ignored time) during which the output current is not detected at the point
where the sink side output is turned on again after being turned off. The output current ignored time is determined by
the discharge time for the capacitor connected to the C pin. This discharge starts at the point where the capacitor is
charged to 2V following operation of the current limiter circuit. The output current ignored time is the time for the
capacitor to discharge to 0.4V (typical). The capacitor discharge current is a fixed current and is set to be a current
about three times the charge current. Therefore, the output current ignored time is about 1/3 the output off time. The
capacitor discharge current ICH and the output current ignored time tsm are related as follows.
ICH ≈ 1.3/R × 3
tsm ≈ C/ICH × 1.6
≈ 0.41 × R × C
Since the current limiter circuit provides a slope to the on time when the sink side output is turned on again, the
reverse circuit never becomes significantly large, even if a rectifying diode (i.e. a diode whose reverse recovery time
is not particularly short) is used as the regenerative current absorption external diode.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LB1695D | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:LB1695D |
| LB1695M | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:DC Fan Motor Driver |
| LB1696 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:3-phase Brushless Motor Driver |
| 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 |
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