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| 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： | 8/9页 |
| 文件大小： | 153K |
| 代理商： | LB1695 |
LB1695
No.5678-8/9
7.3 Output off time setting
The output off time must be set to a period optimal for the type of motor used. This time is set by the values of the
external resistor attached to the R pin and the external capacitor attached to the C pin. Figure 1 shows the
waveforms during current limiter operation.
(1) If a shorter output off time is used:
Since the output off time and the output current ignored time are set to have a ratio of about 3:1 by IC internal
circuits, it is not possible to set these periods independently. Thus the output current ignored period may become
insufficient if the output off time is set to an excessively short period. If the output current ignored period is too
short, the reverse current in the regenerative current absorption external diode may cause the current limiter circuit
to operate. (See Section 7.2.) Also, if the output off time is decreased, the diode reverse current will increase and
ASO may become a problem.
(2) If a longer output off time is used:
If an excessively long output off time is used, the average current will decrease resulting in reduced torque during
motor startup. For some motor types, this may make it impossible to switch from the current limiter operating state
to steady state operation.
2.0V
0.4V
0.0V
0.5V
0.0V
tso
tsm
toff
C pin voltage
RF pin voltage
Figure 1. Current Limiter Operating Waveforms
8. IC internal power dissipation calculation
Pd = (VCC × ICC) + (VM × IM) (power dissipated in the motor coils)
9. Techniques for measuring IC internal temperature increases
Since it is not possible to measure the IC internal temperature directly, one of the following techniques is normally used
for temperature measurement.
9.1 Thermocouple measurement
When using a thermocouple for temperature measurement, the thermocouple is attached to a fin on the heat sink.
While this measurement technique is simple, it suffers from large measurement errors when the thermal generation
process is not at steady state.
9.2 Measurement using IC internal diode properties
We recommend using the properties of the parasitic diode that exists between FG1 and ground for measuring the
temperature of this IC. Set FG1 to the high (off) state and measure the VF voltage of the parasitic diode. Then
calculate the temperature from the temperature characteristics of the VF voltage.
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| LB1830M | BRUSH DC MOTOR CONTROLLER, 0.5 A, PDSO10 |
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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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