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Cohen,
DRV8847S is not a DC/DC converter. It doesn't supply 6V or 12V. So, you still need a 6V or 12V DC/DC or AC/DC supply to provide 6V or 12V to DRV8847S circuit to drive the solenoid.
With google search, we can find several solenoid reference designs.
http://www.ti.com/tool/TIDA-01250
http://www.ti.com/lit/ug/tidu578/tidu578.pdf?ts=1588607279816