- 您现在的位置：买卖IC网 > PDF目录39188 > LB1695D BRUSHLESS DC MOTOR CONTROLLER, 2 A, PDIP20 PDF资料下载
参数资料
| 型号： | LB1695D |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 2 A, PDIP20 |
| 封装： | HEAT SINK, DIP-20 |
| 文件页数： | 9/10页 |
| 文件大小： | 232K |
| 代理商： | LB1695D |
LB1695D
No. 6205-8/10
7.
Current limiter circuit
The current limiter circuit cuts off the sink-side output transistors when the output current reaches a preset value
(limiter value). This limits the output current peak value.
For detection of output current, the RF pin is used. By connecting the resistance Rf between the RF pin and
ground, the output current can be detected as a voltage. When the RF pin voltage reaches 0.5V (typ.), the current
limiter is activated. This limits the output current to the value determined by 0.5/Rf.
7-1.
Output off time
When the current limiter circuit was triggered and has switched off the sink-side output transistors, it will
turn them on again after a preset interval (power off time). By switching the output in this way, the current
limiter circuit of the LB1695D reduces the likelihood of ASO problems as compared to current limiters using
the non-saturation output principle.
The output off time is determined by the charge time for the capacitance C connected to the C pin. When the
limiter is triggered, C starts to charge, and the time required for the C voltage to reach 2V (typ.) is the output
off time. When C was charged to 2V, the sink-side output is turned on again. The charge current for C is
constant-current and is determined by the resistance R connected to the R pin. The C charge current ICL and
the output off time toff are calculated according to the following equations.
ICL = 1.3/R (R should be between 13 kΩ to 100 kΩ)
toff
= C/ICL × 2.0
= 1.53
× R × C
7-2.
Output current ignore time
While the sink-side output is turned off by the current limiter, a regenerative current flows in the upper side
regenerative current absorption diode connected externally. When the output off time has elapsed and the
sink-side output is turned on again, a momentary reverse current flows in the external diode (due to the
reverse recovery time of the diode), which causes a limiter-value current to flow momentarily in the output.
If this triggers the current limiter again, the output will be turned off, which lowers the average current and
causes a reduction in motor torque for example during startup. To prevent this, the circuit is designed not to
monitor the output current for a certain period after the sink-side output were turned off and on again. This is
called the output current ignore time.
The output current ignore time is determined by the discharge time of the capacitance C connected to the C
pin. After the current limiter was triggered and C was charged to 2V, the discharge process starts. The time
required to discharge to a voltage of 0.4V (typ.) is the output ignore time. The discharge current for C is
constant-current and is about 3 times the charge current (ICL). Therefore the output current ignore time is
about 1/3 of the output off time.
The C discharge current ICH and the output current ignore time tsm are calculated according to the following
equations.
ICH = 1.3/R × 3
tsm
= C/ICH × 1.6
= 0.41
× R × C
Continued from preceding page
Continued on next page
.
相关PDF资料 |
PDF描述 |
|---|---|
| LB1740-6R | 1-OUTPUT 680 W AC-DC PWR FACTOR CORR MODULE |
| LB1836M | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| LB1837M | SPECIALTY ANALOG CIRCUIT, PDSO14 |
| LB1845 | STEPPER MOTOR CONTROLLER, 1.75 A, PDFM28 |
| LB1845 | STEPPER MOTOR CONTROLLER, 1.75 A, PDFM28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LB16CGG01-05-BJ | 制造商:NKK 制造商全称:Nihon Kaiheiki Industry Co. Ltd. 功能描述:Standard Size Pushbuttons |
发布紧急采购，3分钟左右您将得到回复。