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FA5316P 参数 Datasheet PDF下载

FA5316P图片预览
型号: FA5316P
PDF下载: 下载PDF文件 查看货源
内容描述: 双极型集成电路开关电源控制 [Bipolar IC For Switching Power Supply Control]
分类和应用: 开关
文件页数/大小: 17 页 / 263 K
品牌: FUJI [ FUJI ELECTRIC ]
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FA531X series  
Design advice  
1. Startup circuit  
It is necessary to start-up IC that the voltage inclination of  
VCC terminal “dVcc/dt” satisfies the following equation(4).  
dVcc/dt(V/s)>1.8/Cs(µF)...............................(4)  
Cs : Capacitor connected between CS terminal and GND  
Note that equation (4) must be satisfied in any condition. Also,  
it is necessary to keep “latch mode” for overload protection or  
overvoltage protection that the current supplied to VCC  
terminal through startup resistor satisfies the following  
equation(5).  
Icc(Lat)> 0.4mA for Vcc Ϲ 9.2V ..................(5)  
Icc(Lat) : Cutoff-state( = Latch mode ) supply current  
The detail is explained as follows.  
Fig. 20 Startup circuit example(1)  
(1) Startup circuit connected to AC line directly  
Fig. 20 shows a typical startup circuit that a startup  
resistor Rc is connected to AC line directly. The period from  
power-on to startup is determined by Rc, RD and CA. Rc, RD  
and CA must be designed to satisfy the following equations.  
dVcc/dt(V/s)=  
(1/CA) • {(VAVE–Vccon )/RC–Vccon/RD–Iccst} >  
1.8/(Cs(µF))................................................(6)  
Rc(k)< (VAVE–9.2(V))/{0.4 (mA) + (9.2(V)/RD(k) } ...........(7)  
VAVE = Vac •ǰ2/π : Average voltage applied to AC line side of Rc  
Vac:  
AC input effective voltage  
Vccon: ON threshold of UVLO, 16.5V(max.) or 16.2V(max.)  
Iccst: Standby current, 0.15 mA(max.)  
In this method, Vcc voltage includes ripple voltage influenced  
by AC voltage. Therefore, enough dVcc/dt required by  
equation (6) tend to be achieved easily when Vcc reaches to  
Vccon even if Vcc goes up very slowly. After power-off, Vcc  
does not rise up because a voltage applied from bias winding  
to VCC terminal decreases and the current flowing RC be-  
comes zero, therefore, re-startup does not occur after Vcc falls  
down below OFF threshold of UVLO until next power-on.  
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