PFCLLCSREVM034: Maximum power issue

Alex Huang

Part Number: PFCLLCSREVM034
Other Parts Discussed in Thread: UCC28056, UCC256404

Hi,

According to the "PFCLCSREVM034 User Guide" document, the maximum designed power is 12V/14A/168W.

The situation I'm currently encountering is:

It can start smoothly (stable) when the input is 110VAC and the load is 10.5A.It starts when the load exceeds 10.5A, and will shut down and restart after about 3 to 10 seconds.

It can start smoothly when the input is 220VAC and the load is 15A, without the above problems.

So I want to increase the maximum power to 180W, or even 200W?

1. What parts need to be changed?

2. Or is there any way to solve the problem of insufficient power at low voltage?

Best Regards

over 1 year ago

0 Mike O' over 1 year ago

TI__Guru* 86016 points

Hello,

I can't find a link to what you have listed in ti.com as User's guide. Could you give me more information?

1. Devices used in your design?

2. A web link to the actual design in question?

Regards,

0 Alex Huang over 1 year ago in reply to Mike O'

Prodigy 20 points

Hi Mike...

Original name: PFCLLCSREVM-034 User Guide

TKS

0 Mike O' over 1 year ago in reply to Alex Huang

TI__Guru* 86016 points

Hello,

This design uses the UCC28056 PFC and the UCC256404 LLC controllers.

If you need to increase the power you will need to redesign both power stages completely.

The UCC28056 and UCC256404 have Excel design tools that you can use to redesign the power stages and setup the controlers. You can find them at the following links.

UCC28056 Excel Design Tool:

https://www.ti.com/tool/download/SLUC641

UCC256404 excel design tool:

https://dr-download.ti.com/design-tools-simulation/calculation-tool/MD-4q9segeylW/01.00.00.0C/sluc675c.zip

Regards,

Power management

Power management forum

PFCLLCSREVM034: Maximum power issue