MC79LXXA/LM79LXXA

8

Typical Application

Design Considerations

The MC79LXXA/LM79LXXA 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 having 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 minimize ground loops and lead resistance drops since the regulator has no external sense lead. Bypassing the output is

also recommended.

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

LM78LXXA

MC78LXXA

LM79LXXA

MC79LXXA

I

MC79LXXA

LM79LXXA