UCC28950: CS pin connected to Vref in TIDA-020031

Part Number: UCC28950

Tool/software:

Hi,

In TIDA-020031, CS pin is connected to Vref through a 0 ohm resistor. Please could you explain why is it connected to Vref in parallel with the current transformer output?

Please see image below:

Thanks

over 1 year ago

0 Mike O' over 1 year ago

TI__Guru* 86266 points

Hello,

Your inquiry is under review and I will get back to you shortly.

Regards,

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

TI__Guru* 86266 points

Hello,

I looked at ti.com and cannot find TIDA-020031. Could you send me the link to this design file?

Regards,

0 SS over 1 year ago in reply to Mike O'

Prodigy 75 points

Hi Mike. I think its no longer available on TI website now. I have uploaded the file here.

8306.TIDA-020031-3.6kW-DC-DC_Sch.pdf

0 Mike O' over 1 year ago in reply to SS

TI__Guru* 86266 points

Hello,

I am reviewing your inquiry and will get back to you shortly.

Regards,

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

TI__Guru* 86266 points

Hello,

Thanks for sharing the original schematic. The Vref pin should not be connected to the CS pin and this is a mistake.

The tida-020031 has been removed from TI.com due to errors in the schematic. Sorry for the inconvenience.

The following link will get you to a UCC28950 600 W evaluation module user's guide that has a complete schematic, that shows how to connect the CS pin up correctly in a phase shifted full bridge.

https://www.ti.com/lit/pdf/sluu421

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UCC28950: CS pin connected to Vref in TIDA-020031