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參數(shù)資料
| 型號(hào)： | MB3800 |
| 廠商： | Fujitsu Limited |
| 英文描述： | Switching Regulator Controller(脈寬調(diào)制系統(tǒng)開關(guān)穩(wěn)壓器控制器) |
| 中文描述： | 開關(guān)穩(wěn)壓器控制器（脈寬調(diào)制系統(tǒng)開關(guān)穩(wěn)壓器控制器） |
| 文件頁數(shù)： | 12/20頁 |
| 文件大小： | 282K |
| 代理商： | MB3800 |
MB3800
12
3.
(1) Soft start and short circuit detection
Other Functions
Soft start operation is set by connecting capacitor C
PE
to the SCP pin (pin 2). Soft start prevents a current spike on
start-up.
On completion of soft start operation, the SCP pin (pin 2) stays low and enters the short circuit detection wait state.
When an output short circuit occurs, the error amplifier output is fixed at V
OM
+ and capacitor C
PE
starts charging.
After charging to approximately 0.8 V, the OUT pin (pin 5) is set low and the SCP pin (pin 2) stays low.
Once the protection circuit operates, the circuit can be restored by resetting the power supply. (See “
■
HOW TO
SET THE TIME CONSTANT FOR SOFT START AND SHORT CIRCUIT DETECTION”.)
(2) Circuit to prevent malfunction at low input voltage
Transients when powering on or instantaneous glitches in the supply voltage can lead to malfunction of the control
IC and cause system damage or failure. The circuit to prevent malfunction at low input voltage detects a low input
voltage by comparing the supply voltage to the internal reference voltage. On detection, the circuit fixes the OUT
pin (pin 5) to low.
The system recovers when the supply voltage rises back above the threshold voltage of the malfunction prevention
circuit.
■
APPLICATION EXAMPLE
1
2
4
3
8
7
6
5
MB3800
3 k
22
μ
H
10
μ
F
270
pF
0.1
μ
F
18 k
V o
(5 V)
2 k
0.1
μ
F
390
CTL
33
μ
F
+
+
V in
(3 V)
FB
OSC
GND
OUT
DIN
SCP
V
CC
BR/CTL
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相關(guān)代理商/技術(shù)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) |
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| 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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