UCC21520: Power dissipation

Daisuke Higa

Part Number: UCC21520

Hi support team.

Is it correct to think that equation (14) for obtaining PGO in the data sheet is for one channel?
Is the idea of doubling for 2 channels correct?

Best regards,

Higa

over 4 years ago

0 Krystian Plaskota over 4 years ago

TI__Expert 4065 points

Hi,

Your intuition is correct, the equation 14 is for one channel and should be doubled for 2 channels.

Regards,

Krystian

0 Daisuke Higa over 4 years ago in reply to Krystian Plaskota

Genius 4315 points

Hi Krystian-san

Thank you for your prompt reply.

I understood.

Best regards,

Higa

0 Wei Zhang over 4 years ago in reply to Daisuke Higa

TI__Intellectual 2061 points

Hello Higa-san, to correct,

Equation 11, 12, 13, 14, 15, 16 and 17 are all for dual channel.

For example, equation 12 if for dual channel, V*Q*fsw is one channel. In equation 14, if external resistance is zero, all the switching related loss will be consumed by gate driver, the value in the bracket will be 2. PGDO equals to PGSW. and PGSW is for dual channel.

To understand each channel, Please refers equation 9 in this application note below.

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UCC21520: Power dissipation