Looking for 12V@10A dc-dc converter from 14.8V @10A battery

Esakkimuthu Shanmuganathan

Other Parts Discussed in Thread: LM25145, LM25141

Hello,

For one of my project, I need to convert 14.8V @10A capacity battery to 12V @ 10A...The 14.8V battery source 's cutoff voltage is 12.8V. So, the dc-dc will be used should give 12V output even when the input is 12.8V.

Do you have any switch regulatoors (Or) controller to do the above?...Please suggest...

Thanks,

Muthu

over 6 years ago

0 JohnTucker over 6 years ago

TI__Guru**** 191445 points

Muthu,

The WEBENCH design tool returned 80 possible solutions for your design requirement. I would suggest looking at LM25116:

www.ti.com/.../lm25116.pdf

0 Timothy Hegarty over 6 years ago

TI__Guru 66602 points

Muthu,

To achieve the low dropout operation from 12.8V to 12V, choose a controller with low minimum off-time spec, for example the LM25145 has a toff-min spec of 140ns and provides high max duty cycle for a given switching frequency.

Regards,

Tim

0 Esakkimuthu Shanmuganathan over 6 years ago in reply to Timothy Hegarty

Intellectual 285 points

Hi Tim,

Thanks. Though the LM25145 datasheet says min 98% duty cycle for switching frequency of 100KHz...When I input 12.8V as Vmin and 15V as Vmax at Webench design of LM25145, it says that the device does not support for the selected inputs...I am getting the same for LM25141...Please suggest the solution...

Thanks.

0 Timothy Hegarty over 6 years ago in reply to Esakkimuthu Shanmuganathan

TI__Guru 66602 points

Not sure about WEBENCH. Please use the LM25145 quickstart calculator to check this. Also, the details are provided in the LM25145 datasheet.

Regards,

Tim

0 Praveen Badiger over 6 years ago in reply to Timothy Hegarty

TI__Expert 8365 points

Hi Muthu,

We are able to create the WEBENCH design for Vin=12.8-15V Vout=12V Iout=10A for frequency <300KHz. Please find the WEBENCH design below.

https://webench.ti.com/appinfo/webench/scripts/SDP.cgi?ID=198D1AE6C6E22E53

Please let us know if you have any query.

Thanks & Regards,
Praveen B

0 Esakkimuthu Shanmuganathan over 6 years ago in reply to Praveen Badiger

Intellectual 285 points

Hi Praveen,

How did you change the switching frequency ?. When I give value in the "User preferred frequency" field, it is not taking and giving error...Please suggest...

Thanks,

Muthu