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Regarding LM5023 60W power supply

Prodigy 30 points

seshaiah bandla

I am using LM5023 IC for 60 AC/DC converter design. Now we are testing the board and facing an issue. IC comp pin voltage is not getting high even though output is lesser than the set voltage,which is happening in light  load condition . With no load condition the voltage is stable. I tried to fix the compensation circuit but no use. I need help to resole this issue.

Prodigy 30 points

seshaiah bandla

• Jun 29, 2015 2:21 PM
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8 Replies

• Genius 14820 points

  

  Peter Meaney

  

  • Jun 30, 2015 9:32 AM

  Hi Seshaiah,
  
  Let me get one of our systems engineers to answer this question for you.
  
  Regards
  
  Peter

  Did we answer your question? Click on the green "Verify Answer" button!

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• Expert 4015 points

  

  Billy Long

  

  • Jun 30, 2015 12:53 PM

  In reply to Peter Meaney:

  Hi Seshaiah, can you send a schematic of the circuit.

  Thanks

  Billy

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• Prodigy 30 points

  

  seshaiah bandla

  

  • Jul 2, 2015 3:13 PM

  In reply to Billy Long:

  Hi Billy,
  I am getting bunch of pulses and output is comming,later softstart and comp pin voltages are going low and pulses are lost. Again 60sec later only pulses are comming as a bunch. it is keep on repeating .This is happening both in no load and light load conditions also. I am thinking this is due to hiccup mode operation or else some thing else. Please suggest me.

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• Prodigy 30 points

  

  seshaiah bandla

  

  • Jul 2, 2015 3:19 PM

  In reply to seshaiah bandla:

  Hi Billy,
  I am unable to attach schematic here. Can you give your mail id.I will send it to you or else please suggest me how to attach here.

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• Expert 4015 points

  

  Billy Long

  

  • Jul 2, 2015 7:17 PM

  In reply to seshaiah bandla:

  Hi Seshaian, there is a paper clip next to the word icon for attaching files, or you can email it to me at billylong@ti.com . Can you send me the transformer information as well, at least the turns ratio.

  Thanks

  Billy

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• Intellectual 2440 points

  

  Mahendra Patel1

  

  • May 19, 2017 10:25 AM

  In reply to Billy Long:

  Hi Billy,
  What was the issue here?
  My customer has similar problem.
  
  Regards,
  Mahendra

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• Intellectual 2850 points

  

  Daniel Ruiz

  

  • May 19, 2017 4:25 PM

  In reply to Mahendra Patel1:

  Mahendra,
  
  Please start a new thread so we can track and respond to your customer's needs. This thread is from a couple of years ago and we did not get all the requested materials from the customer in order for TI to provide debug feedback.
  
  I appreciate your understanding.
  
  - Daniel

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• Intellectual 2440 points

  

  Mahendra Patel1

  

  • May 22, 2017 6:07 AM

  In reply to Daniel Ruiz:

  Sure Daniel!

  Regards,

  Mahendra

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