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LM2574: Getting problem in practical implementation of negative voltage

Part Number: LM2574


Good day

We are using LM2574 chip for 24 V to 12 V Positive voltage and also for negative 12 V voltage generation.

We have designed the circuit as per mentioned in datasheet and simulated it through Lt spice and practically on board also.

It is working well for positive output voltage but for negative output voltage we are getting issues.

In Lt spice simulation it is worked well but practically it is not working.

We have used adjustable model for software simulation.

Is there any other package available for negative output voltage or did i do any mistake in designing?

we have used LM2574HVM-12/NOPB  for both positive and negative.

I am attaching file with it. 

Below is Lt spice simulation:

Below is we practically implemented using fixed voltage :

Your input in this situation is helpful.

Kindly help.


Pallavi Joshi

System Engineer