UCC2895: UCC2895 vs UCC28951

Hello David

The TI website gives a compare option - see http://www.ti.com/power-management/offline-isolated-dcdc-controllers-converters/pwm-resonant-controllers/products.html#p1129=Phase-Shifted%20Full-Bridge for all our PSFB products.

Here's a printout of the comparision I ran on the two parts - /cfs-file/__key/communityserver-discussions-components-files/196/4431.Compare-Parts.pdf

Here's my opinion on the most important differences.

1/ The UCC28951 is a newer device building on the experience we and our customers had with the UCC2895. Both are ACTIVE devices of course and either may be chosen for your application.

2/ The biggest difference is that the UCC28951 has drive signals to control Synchronous Rectifiers. It also disables the SR signals at light loads - to improve light load efficiency by eliminating the SR gate drive losses - at the expense of increased Vf losses in the rectifiers of course. If you plan to use SRs then the UCC28951 is the better choice.

3/ Either device can be placed in the primary or secondary circuit but the UCC28951 is mainly intended for secondary side control which eliminates the need for an optocoupler. The UCC2895 is mainly intended for primary side control.

4/ There are more package options available for the UCC2895. This may be an important factor, depending on your manufacturing process.

5/ Overall, unless you have a specific reason for choosing the other device, the UCC28951 is probably the better option.

Please let us know if you have any further questions.

Regards

Colin