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參數(shù)資料
| 型號： | LB11947 |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSH DC MOTOR CONTROLLER, 1.75 A, PDIP28 |
| 封裝： | 0.500 INCH, DIP-28 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LB11948T | 制造商:SANYO 制造商全稱: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 制造商全稱:Sanyo Semicon Device 功能描述:PWM Constant Current Control 1-2 Phase Excitation Stepping Motor Driver |
| LB11948T_10 | 制造商:SANYO 制造商全稱: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:馬達/運動/點火控制器和驅(qū)動器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| LB11948T-TLM-E | 功能描述:馬達/運動/點火控制器和驅(qū)動器 PRINTER RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
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