|Company||National Semiconductor Corporation|
|Datasheet||Download 7805 datasheet
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 mininize 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 to 57VFeatures
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 packageBottom View Order Number or LM7815CK See NS Package Number KC02A Plastic Package TO-220 (T)
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 70 C Maximum Junction Temperature (K Package) (T Package) Storage Temperature Range Lead Temperature (Soldering 10 sec ) TO-3 Package K TO-220 Package 230 CElectrical Characteristics LM78XXC (Note 125 C unless otherwise noted
Output Voltage Input Voltage (unless otherwise noted) Symbol VO Parameter Output Voltage Conditions s 1A VMIN s VIN s VMAX DVO Line Regulation 25 C DVIN 125 C DVIN 25 C DVIN 125 C DVIN DVO Load Regulation 750 mA Min 5V 10V Typ Max 5 52 Min 12V 19V Typ 12 Max 12 5 Min 15V 23V Typ 15 Max C V Units
125 C VMIN s VIN s VMAX RO Dropout Voltage Output Resistance Short-Circuit Current Peak Output Current Average TC of VOUT 25 C IOUT e 1 kHz 5 mAInput Voltage Required to Maintain s 1A Line Regulation
Note 1 Thermal resistance of the TO-3 package (K KC) is typically C W junction to case and C W case to ambient Thermal resistance of the TO-220 package (T) is typically C W junction to case and C W case to ambient Note 2 All characteristics are measured with capacitor across the input 22 mF and a capacitor across the output 0 1mF All characteristics except noise voltage and ripple rejection ratio are measured using pulse techniques (tw 10 ms duty cycle s 5%) Output voltage changes due to changes in internal temperature must be taken into account separatelyMaximum Average Power Dissipation Maximum Average Power Dissipation Peak Output Current
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