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SG117AK 参数 Datasheet PDF下载

SG117AK图片预览
型号: SG117AK
PDF下载: 下载PDF文件 查看货源
内容描述: 1.5 AMP三端可调稳压 [1.5 AMP THREE TERMINAL ADJUSTABLE VOLTAGE REGULATOR]
分类和应用: 调节器输出元件局域网
文件页数/大小: 8 页 / 261 K
品牌: MICRO-ELECTRONICS [ Micro Electronics ]
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SG117A/SG117SERIES  
APPLICATION INFORMATION (continued)  
BYPASS CAPACITORS  
Input bypassing using a 1µF tantalum or 25µF electrolytic is  
recommended when the input filter capacitors are more than 5  
inches from the device. A 0.1µF bypass capacitor on the  
ADJUST pin is required if the load current varies by more than 1A/  
µsec. Improved ripple rejection (80dB) can be accomplished by  
adding a 10µF capacitor from the adjust pin to ground. For  
improved AC transient response and to prevent the possibility of  
oscillation due to unknown reactive load, a 1µF capacitor is also  
recommended at the output. Because of their low impedance at  
high frequencies, the best type of capacitor to use is solid  
tantalum.  
FIGURE 22 - 5V REGULATOR WITH SHUT DOWN  
FIGURE 20 - REMOTE SENSING  
FIGURE 23 - 21V PROGRAMMING SUPPLY FOR UV PROM/EEPROM  
FIGURE 21 - IMPROVING RIPPLE REJECTION  
LOAD REGULATION  
Because the SG117A is a three-terminal device, it is not possible  
to provide true remote load sensing. Load regulation will be  
limited by the resistance of the wire connecting the regulator to  
the load. For the data sheet specification, regulation is measured  
at the bottom of the package. Negative side sensing is a true  
Kelvin connection, with the bottom of the output divider returned  
to the negative side of the load. Although it may not be immedi-  
ately obvious, best load regulation is obtained when the top of the  
divider is connected directly to the case, not to the load. This is  
illustrated in Figure 18. If R1 were connected to the load, the  
effective resistance between the regulator and the load would be  
FIGURE 24 - 2816 EEPROM SUPPLY PROGRAMMER FOR READ/WRITE CONTROL  
R2 + R1  
RP X  
RP = Parasiti,c Line Resistance.  
(
)
R1  
Connected as shown, RP is not multiplied by the divider ratio. RP  
is about 0.004per foot using 16 gauge wire. This translates to  
4mV/ft. at 1A load current, so it is important to keep the positive  
lead between regulator and load as short as possible.  
FIGURE 25 - TEMPERATURE COMPENSATED LEAD ACID BATTERY CHARGER  
2/93 Rev 1.2 10/02  
LINFINITY Microelectronics Inc.  
Copyright 1994  
11861 Western Avenue Garden Grove, CA 92841  
7
(714) 898-8121 FAX: (714) 893-2570