UCC2897A: Control driven rectification

Sarumathi R

Intellectual 480 points

Part Number: UCC2897A
Other Parts Discussed in Thread: TPS28225

Hi,

We are going to use PMP4844 design for our power requirement Vin 20-32V vout:24V Iout:5A.

In PMP4844 control driven rectification is used.

I am calculated the sync rectifier's power loss calculation and no of mosfets to be used based on the below link.

http://www.ti.com/lit/an/slua535a/slua535a.pdf . This design guide have only self driver rectifier calculation, if I calculate the no of mosfet with is formulas, i get value like <0.5, but in the design 2 mosfets are used.

Is there any separate power loss calculation for control driven sync rectification?

over 4 years ago

0 Colin Gillmor over 4 years ago

TI__Mastermind 25570 points

Hi Sarumathi

I don't know of any design guides that directly answer your question but you might take a look at https://www.infineon.com/dgdl/Infineon-MOSFET_OptiMOS_improving_efficiency_of_synchronous_rectification_by_analysis_of_the_MOSFET_power_loss_mechanism-AN-v03_00-EN.pdf?fileId=db3a304320d39d590121a671f2d90c38 which is an analysis of the MOSFET losses. The losses in the driver can be calculated according to the information in the DS - for example if you use the TPS28225 device Figure15 is a graph of driver Dissipated Power vs Switching Frequency.

Hope this helps - please let us know if you have any further questions.

Regards

Colin

0 Colin Gillmor over 3 years ago in reply to Colin Gillmor

TI__Mastermind 25570 points

Hi Sarumathi

It's been a while since we heard from you so I'll assume you have been able to resolve your issue and I'm closing this post. You can always open a new, linked post if you wish to.

Regards

Colin

Power management

Power management forum

UCC2897A: Control driven rectification