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JAN117T Datasheet(PDF) 7 Page - Micro Electronics |
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JAN117T Datasheet(HTML) 7 Page - Micro Electronics |
7 / 8 page SG117A/SG117 SERIES 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 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 0.1 µF 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 23 - 21V PROGRAMMING SUPPLY FOR UV PROM/EEPROM FIGURE 24 - 2816 EEPROM SUPPLY PROGRAMMER FOR READ/WRITE CONTROL FIGURE 25 - TEMPERATURE COMPENSATED LEAD ACID BATTERY CHARGER 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 R 1 were connected to the load, the effective resistance between the regulator and the load would be Connected as shown, R P is not multiplied by the divider ratio. RP is about 0.004 Ω per 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 20 - REMOTE SENSING ( ) R P X , R P = Parasitic Line Resistance. R 2 + R1 R 1 |
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