UCC28950: hardware & system design tools forum

Nithin c

Part Number: UCC28950

Tool/software:

I tested ucc28950 in open loop what you have mentioned in previous discussion

I have connected error amplifier in voltage follower mode and applied variable power supply at the EA+ pin but still output zero.

the voltage at the SS pin already attached in previous discussion

please help me to fix this problem

6 months ago

0 Mike O' 6 months ago

TI__Guru* 86016 points

Hello,

Could you please copy a link to the thread in this thread?

Thanks,

0 Nithin c 6 months ago in reply to Mike O'

Prodigy 180 points

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1468233/ucc28950-hardware-system-design-tools-forum/5666568#

0 Mike O' 6 months ago in reply to Nithin c

TI__Guru* 86016 points

Hello,

Thanks for sharing the link. It looks like another applications engineer was given you guidance on troubleshooting the design open loop.

If your soft start voltage is up and your design does not have an output, you could have one of the following issues.

Your H Bridge is not connected correctly
Your SRs are not connected correctly
Your transformer turns ratio is not correct

The following link will bring you to an application note that you can use to double check your design.

There is also a section on checking your transformer turns ratio. There is a link to an excel tool in the app note that you can use as well as to check your design.

https://www.ti.com/lit/gpn/ucc28950

I believe that once you have 1 through 3 resolved your design should work.

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UCC28950: hardware & system design tools forum