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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  
2.Disabling overload shutdown function  
As shown in Figure 24, connect a 11kresistor between the  
FB pin and ground. Then, the CS pin voltage does not rise  
high enough to reach the reference voltage (7.0V) of the latch  
comparator, and the IC does not enter the OFF latch mode.  
With this connection, the overvoltage shutdown function is  
available.  
3.Setting soft start period and OFF latch delay  
independently  
Figure 25 shows a circuit for setting the soft start period and  
OFF latch delay independently. In this circuit, capacitance CS  
determines the soft start period, and capacitance CL  
determines the OFF latch delay. If the overload shutdown and  
overvoltage shutdown functions raise the CS pin voltage to  
around 5V, zener diode Zn becomes conductive to charge CL.  
The OFF latch delay can be thus prolonged by CL.  
Fig. 25 Independent setting of soft-start period  
and OFF latch delay  
4. Laying out VCC and ground lines  
Figure 26 and 27 show the recommended layouts of VCC and  
ground lines. The bold lines represent paths carrying large  
currents. The lines must have an adequate thickness.  
5.Sink current setting for CS terminal  
A sink current to CS terminal must be satisfied the following  
condition to prevent from the malfunction which uncontrolled  
pulse output generates at OUT terminal when latch-mode  
protection should be operated for overvoltage.  
65µA < Ics(sink) < 500µA at Vcs= 6.5(V)  
Ics(sink) : Sink current to CS terminal  
Example (for the circuit shown in Fig. 28 )  
Ics(sink) = (28(V)–18(V)– 6.5(V) )/7.5(k)  
Լ 467 (µA) < 500 (µA)  
Fig. 26 Vcc line and ground line (1) for FA5310B/11B/16/17  
Fig. 27 Vcc line and ground line (2) for FA5314/15  
7.5k  
18V Zener diode  
CS  
Fig. 24 Disabling overload shutdown function  
Under 500µA  
VCC  
Fig. 28 Setting sink current for CS terminal  
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