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lm5176: I'm building a webench design using the LM5176 and have a few questions

David C
Expert 3350 points
Part Number: LM5176
Other Parts Discussed in Thread: LM5045, LM5170

Hello,

I just build a webench design for the lm5176 but it's not letting me push the Vout higher. 
Could you guys double check if the lm5176 is a suitable controller for the application below:

Output power : 600W
Input voltage: 24V
Output voltage: 20-29V

Webench design:
 https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=D469978358E5302B

Regards,
David

  • 0
    TI__Guru 68535 points
    600W is excessive for single LM5176, because the integrated driver cannot efficiently drive the large MOSFETs required for 600W. We do have a ref design of 300W, and also are working on a ref design of dual LM5176 for higher power. Pls refer to the following:

    www.ti.com/.../PMP21278
    www.ti.com/.../snva792

    We are working on a simplified dual converter without using the INA devices, and the report will come out later next month.

    Thanks
    Youhao
  • 0
    TI__Expert 3350 points

    If the customer was able to change their vin to 30V, would we have a buck controller that could be used?

    Regards,
    David

  • 0 in reply to David C
    TI__Guru 68535 points
    30Vin to 29Vout requires about 97% duty cycle, which you may consider LM5045. But for your power level, the LM5170 in buck mode may be a better choice: it is dual phase controller with excellent power sharing balance, and you do need a small 10V bias supply and an external op-amp for voltage regulation. You can order the LM5170EVM and verify the concept immediately.