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LM5170EVM-BIDIR: The several buck mode issues

Fatur Rachim

Prodigy 50 points

Part Number: LM5170EVM-BIDIR
Other Parts Discussed in Thread: LM5170

Hi team
I have several issues regarding the operation of the LM5170EVM-BIDIR, which I want to ask. I hope you can help and provide solutions to me.

I have followed the procedure to operate buck mode. For connection details can be seen in the picture.

My question.
1. Why is there no voltage on the 12 V side?
2. The voltage on J-17-pins 5 & 6 is 3.1 V and the current is 3.27 A. Why is the current at the pin high? Is it reasonable? The more I increase the voltage, the current will also increase.
3. Is the connection I have made correct for the buck mode operation?
4. My DC input is 33 V, how do I set the voltage to get 12 V?

I will wait for your reply. thank you

over 5 years ago

0 Garrett Roecker over 5 years ago

TI__Mastermind 21720 points

Hi Fatur,

Thanks for reaching out with your questions and for considering the LM5170 for your application.

Can you please post a picture of the jumper connections that you have made on the EVM? This will help me understand what might be causing the issue.

Thanks,

Garrett

0 Fatur Rachim over 5 years ago in reply to Garrett Roecker

Prodigy 50 points

Hi Garret

Thanks for Replying

These are the pictures of the jumper connections.

I also posted pictures of input voltage and current measurements for J-17-pins 5 & 6 (EN) and J17-pins 11 & 12 (ISETA).

Menampilkan Catatan foto

Menampilkan Catatan foto

You can see that the current & voltage on the EN signal are 3.30 A & 2.7 V.

Current & voltage on ISETA signals are 0.13 A & 1.2 V.

I hope you can help and provide solutions to me about issues of My LM5170EVM-BIDIR. Thank you

Best regards

0 Garrett Roecker over 5 years ago in reply to Fatur Rachim

TI__Mastermind 21720 points

Hi Fatur,

Can you please try posting the pictures again? They are not showing up in the last post.

-Garrett

0 Fatur Rachim over 5 years ago in reply to Garrett Roecker

Prodigy 50 points

Hi Garret

I reuploaded the pictures . Hope this time you'll be able to open the pictures.

Thanks

Best regards

0 Garrett Roecker over 5 years ago in reply to Fatur Rachim

TI__Mastermind 21720 points

Fatur,

Still no pictures. Please try to use the "insert/edit media" button when inserting the pictures.

Just confirm are you following the user guide on how to connect the jumpers?

Thanks,

Garrett