參數(shù)資料
型號(hào)： FA3647P
廠商： FUJI ELECTRIC CO LTD
元件分類： 穩(wěn)壓器
英文描述： PWM control IC with light load power saving function For Switching Power Supply Control
中文描述： 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDIP8
封裝： DIP-8
文件頁(yè)數(shù)： 10/21頁(yè)
文件大?。?/td> 406K
代理商： FA3647P
FA3641P(N), FA3647P(N)
67
Fig. 10 Overload shutdown circuit
4.2 Overload shutdown function
Figure 10 shows the overload shutdown circuit, and Figure 11
is a timing chart that illustrates overload shutdown operation.
If the output voltage drops due to an overload or short circuit,
the FB pin output voltage rises. If the FB pin voltage exceeds
the reference voltage (3.0V) of comparator C3, the output of
comparator C3 goes low to turn off the switch. With the switch
off, the CS pin voltage clamped at 4.0V by zener diode in
normal operation is unclamped, and the constant current
source (6.5
μ
A) begins to charge capacitor Cs again and the CS
pin voltage rises. When the CS pin voltage exceeds the
reference voltage (8.5V) of comparator C2, the output of
comparator C2 toggles to turn off the 5V REF circuit. The IC
then enters the latched mode and shuts down the output. IC
current consumption for shutdown is 45
μ
A (typ) (Vcc = 10V).
This current must be supplied through the startup resistor. The
IC enters output off (low voltage) state.
The overload shutdown operation can be reset by lowering the
supply voltage Vcc to below the OFF threshold voltage (9.0V)
or forcing the CS pin voltage below 7.9V.
The period t
OL
from the time the output is short-circuited to the
time the output circuit goes off is given by the following
equation:
t
OL
[ms] 690 Cs
.................................................. (4)
Cs: Soft start capacitor [
μ
F]
When you want to disable the overload shutdown function, see
item 11 in
“
Design advice
”
4.3 Output ON/OFF control function
The IC can be turned on or off via an external signal applied to
the CS pin. Figure 12 shows the output on/off control circuit,
and Figure 13 is a timing chart.
The IC is turned off when the CS pin voltage is externally made
to drop below 0.68V (typ). The output of comparator C1 goes
high to turn the 5V REF circuit. This shuts the output down.
The IC enters output off (low voltage) state. Required IC
current consumption during shutdown is 100
μ
A (typ) (Vcc =
17V). This current must be supplied through the startup
resistor. The IC goes on when the CS pin is opened and the
CS pin voltage exceeds 0.82V (typ). This turns on the 5V REF
circuit and results in automatic soft start. The power supply
then restarts operation.
Fig. 11 Overload shutdown timing chart
Fig. 12 External output ON/OFF control circuit
Fig. 13 Output ON/OFF control circuit timing chart
相關(guān)PDF資料
PDF描述
FA365 THIN SMD HIGH-FREQUENCY CRYSTAL UNIT
FA-365 THIN SMD HIGH-FREQUENCY CRYSTAL UNIT
FA3675F For Switching Power Supply Control
FA3863X SUPER BRIGHT LED
FA38SA50LC RECTIFIER BRIDGE 25A 200V 350A-ifsm 1.05V-vf 10uA-ir GBJ 15/TUBE
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
FA3647P-D1 制造商:Fuji Electric 功能描述:
FA365 制造商:未知廠家 制造商全稱:未知廠家 功能描述:THIN SMD HIGH-FREQUENCY CRYSTAL UNIT
FA-365 制造商:未知廠家 制造商全稱:未知廠家 功能描述:THIN SMD HIGH-FREQUENCY CRYSTAL UNIT
FA-365 14.31818MHZ 50PPM 16PF 制造商:Epson Toyocom Corporation 功能描述:XTAL FA-365 14.31818MHZ 50PPM 16PF
FA-365 16.0000MB-G3 功能描述:CRYSTAL 16.0000MHZ 20PF SMD RoHS:是 類別:晶體和振蕩器 >> 晶體 系列:FA-365 標(biāo)準(zhǔn)包裝:1 系列:ABLS2 類型:MHz 晶體 頻率:3.579545MHz 頻率穩(wěn)定性:±30ppm 頻率公差:±30ppm 負(fù)載電容:18pF ESR（等效串聯(lián)電阻）:180 歐姆 工作模式:基諧 工作溫度:-40°C ~ 85°C 額定值:- 安裝類型:表面貼裝 封裝/外殼:HC49/US 尺寸/尺寸:0.449" L x 0.185" W（11.40mm x 4.70mm） 高度:0.130"（3.30mm） 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:1683 (CN2011-ZH PDF) 其它名稱:535-9855-1
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*