LM7805 Positive Voltage Regulator IC

LM7805 designed as three terminal regulators is available with several fixed output voltages. These regulator ICs offer very acceptable levels of performance for a wide range of applications. These regulators are widely used in local on card regulation, eliminating the distribution problems associated with single point regulation. The voltages available allow these regulators to used in logic systems, instrumentation, HiFi, and other solid state electronic equipment. And additionally, to the present, these IC available at an affordable rate and quite easy to use. 7805 consists of only three terminals, i.e. input, output, and ground, they require no external components for electronics basic operation. 7805 regulators available within aluminuim TO-3 PAK package and and with several fixed output voltages.

Moreover, these regulator features internal current limiting, thermal shut-down, and safe operating area protection, making it essentially indestructible. Under the condition, if adequate heat sinking provided, they deliver over 1A output current. Although these IC basically designed as fixed voltage regulators, these devices often used with external components to provide adjustable voltages and currents. Three-terminal voltage regulators have three terminals namely input as unregulated (Vin), regulated output (Vo) and customary or a ground terminal. These regulators eliminate the need for any feedback connections. Current limiting feature limit the peak output current to a safe value. Whereas the Safe area protection for the output transistor ensured to limit internal power dissipation. In case, if internal power dissipation becomes too high for the heat sinking provided, the thermal shutdown circuit takes over preventing the IC from overheating.

LM78XX series are quite easy to use and reduce the number of external components. It is not compulsory to bypass the output, although this does improve transient response. Input bypassing required only if the regulator located apart from the filter capacitor of the power supply.