DRV103: 22µF Tantalum Capacitor Burned Out

Part Number:DRV103

So I have completed a prototype circuit using the DRV103, and I'm using it to drive a solenoid. The circuit diagram is shown on the lower half of page 13 of the DRV103 datasheet.

When testing the circuit at 18VDC and about 1.6-1.8A, with 25kHz frequency and 50% duty cycle, the 22µF Tantalum capacitor (rated for 50V) burned out.

I believe the capacitor was connected correctly(Long leg to positive), since testing at 0.5A and at 3.0A (Duty cycle at 100%) with separate solenoids worked.

So I'm interested in finding the cause and learning what not to do in the future.

Thank you,

Alistair