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SG117AL883B Datasheet(PDF) 8 Page - Microsemi Corporation |
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SG117AL883B Datasheet(HTML) 8 Page - Microsemi Corporation |
8 / 9 page SG117 / 217 / 317 / 117A / 217A / 317A Microsemi Integrated Products Division 11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570 Page 8 Copyright © 1994 Rev. 1.3, 2006-02-08 1.5A Three Terminal Adj. Voltage Regulator TM ® APPLICATION IN FORMATION (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 20 – Remote Sensing 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 immediately 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 Resistance Line Parasitic R , R R R R P 1 1 2 P = + • ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ Connected as shown, RP is not multiplied by the divider ratio. RP is about 0.004Ω 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 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 |
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