LM79L05ACZ 查看數據表（PDF） - Fairchild Semiconductor
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LM79L05ACZ Datasheet PDF : 6 Pages
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Typical Application
Design Considerations
The MC79L05A / LC79L05A 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 limits the maxi-
mum current the circuit will pass. In many low-current applications, compensation capacitors are not required. How-
ever, 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 ensure 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.
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.
LM78L05A
MC78L05A
I
MC79L05A
LM79L05A
LM79L05A
MC79L05A
Figure 2. Positive And Negative Regulator
Figure 3. Typical Application
A common ground is required between the input and the output voltages. The input voltage must remain typically 2.0 V
above the output voltage, even during the low point on the input ripple voltage.
* CI is required if regulator is located an appreciable distance from power supply filter.
** CO improves stability and transient response.
© 2004 Fairchild Semiconductor Corporation
MC79L05A / LM79L05A Rev. 1.1.0
3
www.fairchildsemi.com
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