CHECKDB and TEMPDB space

I have a SQL 2008 R2 Database Server.

On the drive where tempdb is stored, there is 17GB free.

In testing on another server, a CHECKDB of databases will expand the tempDB to 20GB.

What are the options to using CHECKDB without using that much of tempdb space?

Is there a way to reduce tempDB after the CHECKDB is complete?

Thanks in advance.