LM323 Heats Too Much

[iruraz]

Hi All,

I use LM323 for supplying circuit. It is heating very quickly and easily. I have not understood reason. May it be about capacitor values?

Regards.

**broken link removed**

 

[FvM]

Power dissipation is (Vin-Vout)*Iout. If Iout is larger than e.g. 0.5 A, you need a sufficient heat sink.

 

[iruraz]

Power dissipation is (Vin-Vout)*Iout. If Iout is larger than e.g. 0.5 A, you need a sufficient heat sink.

@FvM thanks for reply. There is no load out of LM323. I have not connected the load. I only tried LM323.

 

[crutschow]

Then you likely have it hooked up incorrectly. Double-check the pinout of the particular device you are using.

 

[tpetar]

What is power source? SMPS ?


Best regards,
Peter

 

[iruraz]

What is power source? SMPS ?
Best regards,
Peter

@tpetar, it is not SMPS. It is 12V 5A AC/DC adapter.

Then you likely have it hooked up incorrectly. Double-check the pinout of the particular device you are using.

@crutschow, connection is correct. I checked it many times.

Regards.

 

[kam1787]

No load yet it heats up quickly? and the connections are correct? Are you sure the adapter is giving 12V DC (especially the DC)? Then I'd say it was defective or damaged. Try another one.

 

[tpetar]

@tpetar, it is not SMPS. It is 12V 5A AC/DC adapter.



@crutschow, connection is correct. I checked it many times.

Regards.

Maybe your "adapter" is SMPS inside and gives lots of spikes on output.


Best regards,
Peter

 

[crutschow]

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@crutschow, connection is correct. I checked it many times.

Post a picture of your circuit including the LM323 pins.

 

[iruraz]

@kam1787, @tpetar, @crutschow thanks for your interest and I am sorry for delay. I didn't have any spare LM323 and I changed it with "classic" 7805 ic. Now everything is ok. There is no heating problem anymore.

Regards.