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参数资料
| 型号： | LB11947 |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, 1.75 A, PDIP28 |
| 封装： | 0.500 INCH, DIP-28 |
| 文件页数： | 13/14页 |
| 文件大小： | 154K |
| 代理商： | LB11947 |
LB11947
No.7318-8/14
Switching regulator, soft start function
When the VCC output is about to rise to the target voltage of 5V instantaneously at start of switching regulator (at VBB
power ON), the IC output pulse operates with the maximum duty, causing the rush current to flow to the output transistor.
It is therefore necessary to raise the VCC target voltage gradually so that the output does not operate with the maximum
duty.
Connection of a capacitor between the CSS pin (pin 8) and GND allows slow rising of VCC output (soft start) when VBB
power is applied.
The soft start time (tss) is approximately set by the following equation.
tss
≈ 1.4 × C/Iss
tss : Soft start time
[s]
Iss : Soft start charge current
[
μA]
C : CSS pin capacitor
[
μF]
Switching regulator, switching frequency set time
The switching frequency of switching regulator is varied by changing the capacitor connected between the OSC pin (pin
10) and GND.
The switching frequency (fosc) is set approximately by the following equation. Since this equation is the approximate
expression, check it in the mounted condition when it is to be used at a particularly high frequency.
fosc
≈ {1/C(1/Icosc+1/Idosc)} × 10
-3
fosc : Switching frequency
[kHz]
Icosc : OSC pin charge current
[
μA]
Idosc : OSC pin discharge current
[
μA]
C : OSC pin capacitor
[pF]
VBB
CSS
VCC
tss
5V
1.4V
9V
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LB11948T | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Monolithic Digital IC PWM Constant Current Control 1-2 Phase Excitation Stepping Motor Driver |
| LB11948T_07 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:PWM Constant Current Control 1-2 Phase Excitation Stepping Motor Driver |
| LB11948T_10 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:PWM Constant Current Control 1-2 Phase Excitation Stepping Motor Driver |
| LB11948T-MPB-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 |
| LB11948T-TLM-E | 功能描述:马达/运动/点火控制器和驱动器 PRINTER 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 |
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