UCC3895: application of UCC3895

Raja A R

Part Number: UCC3895
Other Parts Discussed in Thread: UCC2895, UCC28950

Hi TI team,

Whether UCC3895- Phase shift controller IC can be used for Isolated DC-DC Converter for 500W design, can we use the same IC for secondary side synchronous rectification also.

UCC3895 has four outputs, can we use Four PWM pins for switching full bridge along same two PWM pins for synchronous rectification.

Regards

Raja

over 2 years ago

0 Mike O' over 2 years ago

TI__Guru* 80686 points

Hello,

I believe you can control the SRs with the A and B outputs, gate driver and a 1 to 2 gate drive transformer. You would drive the primary of the transformer with the A and B outputs.

There is an application note that describes how to drive SRs with the UCC2895. The following link will bring you to the application note. It uses a little bit of logic to make sure the gate drivers are on only during energy transfer.

https://www.ti.com/lit/an/slua287/slua287.pdf

There is another option. You could use the UCC28950 which has outputs E and F for gate drive control.

Regards,

0 Raja A R over 2 years ago in reply to Mike O'

Prodigy 10 points

Hello Mike,

Thanks in advance

I have followed above mentioned application note; https://www.ti.com/lit/an/slua287/slua287.pdf

Designed schematic for 500W isolated DC-DC Converter,

Kindly provide your mail id, so i can share the schematic and get confirmed for using the same logic.

0 Mike O' over 2 years ago in reply to Raja A R

TI__Guru* 80686 points

Hello,

Did you have any issues driving the SRs?

Regards,

Power management

Power management forum

UCC3895: application of UCC3895