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TMS3705: Range extender solution using UCC27424/UCC27524

Part Number: TMS3705
Other Parts Discussed in Thread: UCC27524, UCC27424

Hi,

I have a question in regarding to how to calculate the thermal dissipation of the range extender solution described in scba031.

It would aid me in deciding the heat sink solution for the UCC27524.

Specifically if Vcc=15V, with the default 3.3nF / 440uH coil (say coil has 10 Ohm ESR at 134.2 kHz) how would one determine:

1. The power dissipated in UCC27524?

I have read the power dissipation part in the datasheet of UCC27524, however it is for the application of driving a MOSFET where the majority of energy used for charging the gate capacitance is lost as heat. In the range extender solution there are also large amount of power become reactive and stored in the coil.

Thanks,

Nick