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Features
Output current in excess of 1A
Internal thermal overload protection
No external components required
Output transistor safe area protection
Internal short circuit current limit
Available in the aluminum TO-3 package
Description The LM78XX series of three terminal regulators is available with several fixed output voltages making them useful in a wide
range of applications. One of these is local on card regulation, eliminating the distribution problems associated with single
point regulation. The voltages available allow these regulators to be used in logic systems, instrumentation, HiFi, and other
solid state electronic equipment. Although designed primarily as fixed voltage regulators these devices can be used with external
components to obtain adjustable voltages and currents.
The LM78XX series is available in an aluminum TO-3 package which will allow over 1.0A load current if adequate heat sinking
is provided. Current limiting is included to limit the peak output current to a safe value. Safe area protection for the output
transistor is provided to limit internal power dissipation. If internal power dissipation becomes too high for the heat sinking
provided, the thermal shutdown circuit takes over preventing the IC from overheating.
Considerable effort was expanded to make the LM78XX series of regulators easy to use and minimize the number of external components.
It is not necessary to bypass the output, although this does improve transient response. Input bypassing is needed only if
the regulator is located far from the filter capacitor of the power supply.
For output voltage other than 5V, 12V and 15V the LM117 series provides an output voltage range from 1.2V to 57V.
See Also: LM3480 - better line/load/dropout voltage
See Also: LM340 - direct replacement
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