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LM7805 gets heated easily!!!

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prasanthceg

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whenever i connect 8 ir sensors(for line tracing) to LM7805,it gets heated up in no time.. i tried using a heatsink.. but the heatsink also gets heated up.. i supplied 12v to 7805.. can anyone suggest a solution for reducing the heat dissipation from 7805??
 

Assuming the circuit's power requirement is fixed and can't be reduced at will, you have these options:
- use a lower primary supply voltage, if available
- use a larger heatsink
- use a switching regulator, e.g. National Simpleswitcher family, LM257x or 267x.
 

prasanthceg said:
whenever i connect 8 ir sensors(for line tracing) to LM7805,it gets heated up in no time.. i tried using a heatsink.. but the heatsink also gets heated up.. i supplied 12v to 7805.. can anyone suggest a solution for reducing the heat dissipation from 7805??
Click to expand...
Connecting 8 IR sensors for one 7805 (may be along with a microcontroller too will be some whar burden on the regulator when it is fed with 12 volts as the dropping margin is more and its natural to get heated. You may use a TO3 package of LM7805 with a suitable heatsink, or other options as mentioned by "FvM"
 

prasanthceg said:
whenever i connect 8 ir sensors(for line tracing) to LM7805,it gets heated up in no time.. i tried using a heatsink.. but the heatsink also gets heated up.. i supplied 12v to 7805.. can anyone suggest a solution for reducing the heat dissipation from 7805??
Click to expand...

try to using switching like this
**broken link removed**

regards
 

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