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I am using L7805CV from STmicroelectronics to give 5V supply to all the units in the ckt. My ckt consisting of AT89S52, 16×2 alphanumeric LCD, SM630 module. When I have interfaced LCD to AT89S52 and programed to display msg it worked fine but when I interfaced SM630 to AT89S52 and programed it program worked correctly but 7805 IC gets heated up like a solder iron in about 30 to 40 sec when I switched on. And I have to switch it off often and often to cool it. Why 7805 gets heated up when I interfaced SM630. Can this problem be avoided using heat sink?
The 7805 normally available can supply maximum current around 1A only. The SM630 might consume more than that much power and that’s why the 7805 gets heated up.
To avoid this problem use use the 7805 which comes in TO-3 package. This package can supply more current and use can effectievely use a large heat sink with it.
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