UCC28951-Q1: EV Battery charger 40-57 V 40A

Arun Thawait

Part Number: UCC28951-Q1
Other Parts Discussed in Thread: UCC28951, UCC28950

Hello sir,

We are trying to design a battery charger of output voltage range 40 to 57 V with 40 A as CC current .Our operating switching frequency is 50kHz. We have selected PSFB as our second stage converter for which we are using UCC28951 as our controller IC . We want to provide Different adaptive delays to Leading leg Switches (A and B) and lagging leg switches (C and D) .We have decided to short the CS pin and ADEL pin as well as ADELEF Pin so that we can get maximum adaptive delay based on CS pin Voltage. Will it work if we do so? Also I have the following questions -

For adaptive delays based on CS pin voltage do we need to connect RDELAB and RDELCD and RDELEF as well.
If we short the CS pin with ADEL what will be the CS pin voltage at the time of ZVS ??
How to select the value of RA and RAEF if RAHI and RAEFHI is Zero .

Regards

over 4 years ago

0 Mike O' over 4 years ago

TI__Guru* 85726 points

Hello,

Are you aware of the Webench design tool that will do a paper design for you? You enter the input and output power requirements and the tool will generate a schematic and BOM. You can find it at the following link. https://www.ti.com/product/UCC28951?keyMatch=UCC28951&tisearch=search-everything&usecase=GPN#design-development Just search for Webench when you get to the page.

There is a detailed application note that goes through the step by step design process for the UCC28950 and UCC28951 devices that can be found at the following link. This design technique uses a fixed delay approach that discusses how to setup the components around the UCC28950. Please note that even though the application note is for the UCC28950 it still applies for the UCC28951. The devices are parametrically the same and the UCC28951 has slight performance improvements added. https://www.ti.com/lit/an/slua560c/slua560c.pdf

There is also an Excel tool that can be used to help with your design that can be found at the following link. The calculations in it are the same as the application note above. https://www.ti.com/lit/zip/sluc222

Regards,

0 Arun Thawait over 4 years ago

Prodigy 155 points

Thanks for your reply .

Power management

Power management forum

UCC28951-Q1: EV Battery charger 40-57 V 40A