UCC28950-Q1: Power dissipation in active clamp MOSFET - Power management forum - Power management

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yathavakannan viswa

Prodigy 70 points

Part Number: UCC28950-Q1

Tool/software:

Please refer the mentioned thread. What losses occur in an active clamp MOSFET? I'm using an active clamp MOSFET as a 650V GaN FET.

e2e.ti.com/.../ucc28950-q1-secondary-ringing-voltage-is-twice-the-amplitude-of-the-output-voltage

11 months ago

0 Mike O' 11 months ago

TI__Guru* 86206 points

Hello,

I am reviewing your inquiry and will get back to you shortly.

Regards,

0 Mike O' 11 months ago in reply to Mike O'

TI__Guru* 86206 points

Hello,

I found a white paper on active clamp PSFB at the following link.

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1426365/ucc28950-q1-power-dissipation-in-active-clamp-mosfet

I reviewed the paper and the clamp FET current is triangulator.

I would estimated the FET losses are based on triangular current and switching losses.

Clamp FET Power Dissipation Estimation = (FET_Peak_Current/2)*Vswitsch*(tr+tf)*frequency + (Ipeak*(FET_conduction_time*frequency/3)^0.5)^2*Rdson

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