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7805 Regulator Output Drops to 2V When Converting 30V DC to 5V—Why?

7805 Regulator Output Drops to 2V When Converting 30V DC to 5V—Why?

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#1 21670998 09 Feb 2014 02:16

Susheel parashar Susheel parashar

Anonymous

Post #1
21670998 09 Feb 2014 02:16

I have a 30 V DC input but I have to run a circuit using 5 V supply.

So, for converting 30 V DC to 5 V I'm using 7805 voltage regulator. But when I connect the output of 7805 (i.e. 5 V) to the circuit which needs 5 V, the 5 V reduces to 2 V and the circuit doesn't run. Please help. What can be the possible issues why it wont work.
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#2 21670999 09 Feb 2014 09:34

DAVID CUTHBERT DAVID CUTHBERT

Anonymous

Post #2
21670999 09 Feb 2014 09:34

It sounds like the 5 volt circuit current draw exceeds the capability of the 7805 or the 7805 is heating up and going into thermal limit.

How much current does the 5 volt load draw?
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7805 Regulator Output Drops to 2V When Converting 30V DC to 5V—Why?

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