BQ51050B: CLAMP capacitors

Part Number:BQ51050B

Hi,

The data sheet states that the CLAMP capacitors are used to aid the clamping process to protect against overvoltage. Choosing a 0.47-µF capacitor with a 25V rating is appropriate for most applications. What applications would this not be appropriate for? Using a bq51050BEVM-764 with 25V CLAMP capacitor I used a transmitter coil to transmit 10W at various frequencies and noticed that the bq51050B got extremely hot and eventually stopped working. However, I replaced the 25V capacitors with 50V and did not see the problem. I would like to understand this, but there is not much information about how this CLAMP circuit works. 

Thanks,

Thomas Fanous