7812 – Series Voltage Regulators

Part Number : 7812

Function : Series Voltage Regulators

Manufactures : National Semiconductor

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Description :

LM78XX Series Voltage Regulators May 2000 LM78XX Series Voltage Regulators General 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. Features n n n n n n 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 Voltage Range LM7805C LM7812C LM7815C 5V 12V 15V Connection Diagrams Metal Can Package TO-3 (K) Aluminum Plastic Package TO-220 (T) DS007746-3 DS007746-2 Bottom View Order Number LM7805CK, LM7812CK or LM7815CK See NS Package Number KC02A Top View Order Number LM7805CT, LM7812CT or LM7815CT See NS Package Number T03B © 2000 National Semiconductor Corporation DS007746 www.national.com LM78XX Schematic DS007746-1 www.national.com 2 LM78XX Absolute Maximum Ratings (Note 3) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage (VO = 5V, 12V and 15V) Internal Power Dissipation (Note 1) Operating Temperature Range (TA) 35V Internally Limited 0˚C to +70˚C Maximum Junction Temperature (K Package) (T Package) Storage Temperature Range Lead Temperature (Soldering, 10 sec.) TO-3 Package K TO-220 Package T 150˚C 150˚C −65˚C to +150˚C 300˚C 230˚C Electrical Characteristics LM78XXC 0˚C ≤ TJ ≤ 125˚C unless otherwise noted. Output Voltage Input Voltage (unless otherwise noted) Symbol VO Parameter Output Voltage Conditions Tj = 25˚C, 5 mA […]

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7812 Datasheet

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