LM5045: Running in Open loop

JANAKI RAM PAGOLU

Part Number: LM5045

I need support in running the LM5045 in open Loop mode. i.e. my application is to get a varying duty cycle Full Bridge Circuit Output using a trimpot.

Please help.nijiyam1.pdf

over 6 years ago

0 JANAKI RAM PAGOLU over 6 years ago

Prodigy 110 points

an any one provide necessary details? Thanks.

0 Sonal Singh over 6 years ago in reply to JANAKI RAM PAGOLU

TI__Expert 6080 points

Hello Gopal,

To run in open loop you can leave the COMP pin open to operate LM5045 at the max duty cycle. The max duty cycle for each phase is limited by the dead-time set by the RD1 resistor. If the RD1 resistor is set to zero then the max duty cycle is slightly less than 50% due to the internally fixed dead-time.
This is described in more detail on page 18 of the datasheet. I cannot access your attachment, could you attach it as an image.

Regards,
Sonal

0 Peter Meaney over 6 years ago in reply to Sonal Singh

TI__Mastermind 31580 points

Hi Gopal,

I hope you have amde some progress in the meantime, since there has been activity on this post I am going to close it. Please open a new post if you more questions.

Regards

Peter

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LM5045: Running in Open loop