KA79LXXA

8

Typical Application

Design Considerations

The KA79LXXA Series of fixed voltage regulators are designed with Thermal Overload Protection that shuts down the circuit

when subjected to an excessive power overload condition. Internal Short Circuit Protection that limits the maximum current

the circuit will pass. In many low current applications, compensation capacitors are not required. However, it is recommended

that the regulator input be bypassed with a capacitor if the regulator is connected to the power supply filter with long wire

lengths, or if the output load capacitance is large. An input bypass capacitor should be selected to provide good high frequency

characteristics to insure stable operation under all load conditions. A 0.33

µF or larger tantalum, mylar, or other capacitor hav-

ing low internal impedance at high frequencies should be chosen. The bypass capacitor should be mounted with the shortest

possible leads directly across the regulator's input terminals. Normally 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 output is also recom-

mended.

A common ground is required between the input and the output voltages. The input voltage must remain typically 2.0V above

the output voltage even during the low point on the input ripple voltage.

Figure 1. Positive And Negative Regulator

Figure 2. Typical Application

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