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APL78L05 Datasheet(PDF) 8 Page - Anpec Electronics Coropration |
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APL78L05 Datasheet(HTML) 8 Page - Anpec Electronics Coropration |
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8 / 17 page  APL78L05/12 www.anpec.com.tw 8 Copyright © ANPEC Electronics Corp. Rev. A.11 - Jun., 2011 Application Information Input Constant Current to Grounded Load R APL78L05 lO 0.33 µF The APL78L05/12, series of fixed voltage regulators, are designed with thermal overload protection that shuts down the circuit when subjected to an excessive power overload condition. In addition, the APL78L05/12 have the func- tion of internal short circuit protection to limit the maxi- mum current the circuit will pass. In many low current applications, compensation capaci- tors are not required. However, it is recommended that the regulator input will be bypassed with a capacitor if the regulator connects to the power supply filter with long wire lengths, or if the output load capacitance is large. The input bypass capacitor should be selected to provide good high-frequency characteristics to insure stable operation under all load conditions. If the value of the capacitor is greater than 0.33 µF, the capacitor with tan- talum or mylar, or other capacitor having low internal im- pedance at high frequencies should be chosen. The by- pass capacitor should be mounted with the shortest pos- sible leads directly across the regulators input terminals. Good construction techniques should be used to mini- mize ground loops and lead resistance drops since the regulator has no external sense lead. Bypassing the out- put is also recommended. Figure 1. Current Regulator MC1741 0.33 µF +20V 0.33 µF 20V MPSU55 6.5 MPSA70 10K 10K +VO -VO 3 2 4 6 7 APL78L05 The APL78L05 regulators can also be used as a cur- rent source when connected as above. In order to mini- mize dissipation, the APL78L05 is chosen in this application. Resistor R determines the current as be- low : I O = + I B 5.0V R I B =3.8mA over line and load changes For example, a 100mA current source would require R to be a 50 Ω, 1/2W resistor and the output voltage compli- ance would be the input voltage less 7V. Figure 2. ±15V Tracking Voltage Regulator Figure 3. Positive and Negative Regulator +VI 0.1 µF APL78LXX 0.33 µF APL79LXX 0.33 µF 0.1 µF +VO -VO -VI |
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