04-06-2013, 04:47 PM
LM7805 Positive Voltage Regulator
Positive Voltage.doc (Size: 85.5 KB / Downloads: 16)
POWER SUPPLY
An AC to DC adaptor as been used to get DC input for the mother board. In mother board, we have developed a 5V regulator circuit, which is needed for microcontroller as supply voltage. LM7805 is used for 5V regulated supply.
General Description
The LM78XX series of three terminal positive regulators are available in the TO-220 package and with several fixed output voltages, making them useful in a wide range of applications. Each type employs internal current limiting, thermal shut down and safe operating area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 1A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents.
Features
• Output current in excess of 0.5A
• No external components
• Internal thermal overload protection
• Internal short circuit current-limiting
• Output transistor safe-area compensation
• Available in TO-220, TO-39, and TO-252 D-PAK packages
• Output voltages of 5V, 12V, and 15V