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AN78L12M 参数 Datasheet PDF下载

AN78L12M图片预览
型号: AN78L12M
PDF下载: 下载PDF文件 查看货源
内容描述: 3针正输出电压调节器( 100毫安型) [3-pin positive output voltage regulator (100 mA type)]
分类和应用: 调节器
文件页数/大小: 12 页 / 176 K
品牌: PANASONIC [ PANASONIC ]
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AN78Lxx/AN78LxxM Series  
I Basic Regulator Circuit  
Input  
Output  
1
2
AN78Lxx  
CO  
CI  
3
CI is necessary when the input line is long.  
CO improves the transient response.  
I Usage Notes  
1. Cautions for a basic circuit  
CI: When a wiring from a smoothing circuit to a three-pin regulator  
Di  
is long, it is likely to oscillate at output. A capacitor of 0.1µF to  
0.47µF should be connected near an input pin.  
CO: When any sudden change of load current is likely to occur,  
connect an electrolytic capacitor of 10µF to 100µF to improve a  
transitional response of output voltage.  
Di: Normally unnecessary. But add it in the case that there is a  
residual voltage at the output capacitor Co even after switching  
off the supply power because a current is likely to flow into an  
output pin of the IC and damage the IC.  
VI  
VO  
1
3
CO  
2
CI  
Figure 1  
2. Other caution items  
1) Short-circuit between the input pin and GND pin  
If the input pin is short-circuitted to GND or is cut  
off when a large capacitance capacitor has been con-  
nected to the IC's load, a voltage of a capacitor con-  
nected to an output pin is applied between input/out-  
put of the IC and this likely results in damage of the  
IC. It is necessary, therefore, to connect a diode, as  
shown in figure 2, to counter the reverse bias between  
input/output pins.  
出力�  
1
3
In  
Out  
+
CO  
2
GND  
Figure 2  
2) Floating of GND pin  
If a GND pin is made floating in an operating mode, an unstabilized input voltage is outputted. In this case, a  
thermal protection circuit inside the IC does not normally operate. In this state, if the load is short-circuited or  
overloaded, it is likely to damage the IC.  
I Application Circuit Examples  
VI  
Q1  
VO  
VI  
1
2
20  
IO  
AN78Lxx  
VO'  
R2  
R1  
3
1
VO  
2
AN78Lxx  
0.1µF  
0.33µF  
IBias  
3
VO'  
VO = VO' + IBias + R1  
R2  
Note) VO varies due to sample to sample variation of IBias  
.
Never fail to adjust individually with R1 .  
SFF00005CEB  
10