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參數(shù)資料
| 型號： | MB3800 |
| 廠商： | Fujitsu Limited |
| 英文描述： | Switching Regulator Controller(脈寬調制系統(tǒng)開關穩(wěn)壓器控制器) |
| 中文描述： | 開關穩(wěn)壓器控制器（脈寬調制系統(tǒng)開關穩(wěn)壓器控制器） |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 282K |
| 代理商： | MB3800 |
MB3800
7
■
HOW TO SET THE TIME CONSTANT FOR SOFT START AND SHORT CIRCUIT
DETECTION
1.
Soft Start
At power on, the capacitor C
PE
connected to the SCP pin (pin 2) starts charging. The PWM comparator compares
the soft start setting voltage as a proportion of the voltage at the SCP pin with the sawtooth waveform.
The comparison controls the ON duty of the OUT pin (pin 5), causing the soft start operation. On completion of soft
start operation, the voltage at the SCP pin stays low, the soft start setting voltage stays high, and the circuit enters
the output short circuit detection wait state.
Soft start time (The time until the output ON duty reaches approximately 50%)
t
S
[s]
0.35
×
C
PE
[
μ
F]
2.
If the switching regulator output suddenly drops due to load effect, the error amplifier output (FB pin (pin 8)) is fixed
at VOM
+
and capacitor C
PE
starts charging. When the voltage at the SCP pin reaches approximately 0.8 V, the OUT
pin (pin 5) is set low and the SCP pin (pin 2) stays low.
Short Circuit Protection
Once the protection circuit operates, the circuit can be restored by resetting the power supply.
Short circuit detection time
t
PE
[s]
0.8
×
C
PE
[
μ
F]
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相關代理商/技術參數(shù) |
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|---|---|
| MB3800_06 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Switching Regulator Controller (Low Voltage) |
| MB3800PF | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Switching Regulator Controller (Low Voltage) |
| MB3800PF-E1 | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Switching Regulator Controller (Low Voltage) |
| MB3800PF-G-BND-JNE1 | 制造商:Fujitsu 功能描述:Bulk |
| MB3800PFV | 制造商:FUJITSU 制造商全稱:Fujitsu Component Limited. 功能描述:Switching Regulator Controller (Low Voltage) |
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