Hi Ran,
We don't have the web-orderable EVM for TPS51631. You may refer to TPS59640 and TPS59640 web-orderable EVM. The datasheet and EVM user's guide of TPS59640 are available in the website. They are pretty similar. Or you can contact Rama Venkatrama for further help. Rama's email address: rama-venkat@ti.com
Thanks,
Nancy