TPS546C23: questions of datasheet and EVM

Hey Jimmy,

I'll get back to you tomorrow.

Thanks,

Caleb

Hi Caleb,

waiting for your good news.

BR,

Jimmy

Hey Jimmy,

I've figured out the  issue. You are looking at the EVM schematic for the two output EVM, not dual phase.

Here is the correct product page: https://www.ti.com/tool/TPS546C23EVM2-746 
and here is the correct userguide: https://www.ti.com/lit/ug/sluubh5a/sluubh5a.pdf?ts=1711479161286&ref_url=https%253A%252F%252Fwww.ti.com%252Ftool%252FTPS546C23EVM2-746

The current limit issue may be related to the confusion between the EVMs as well. Is your customer using a dual output or two phase EVM?

Thanks,
Caleb

Hi Caleb,

I saw the product page you shared. the RSP/RSN and R14/R17 are still unclear. How are RSP/RSN connected? Where are R14/R17 connected?

My customer use a output with 2 phase design and have built their PCB already which is following the datasheet's recommendation(below picture) and have current limit issue. but EVM is different between slave's FB pin as the 1st question I asked.  

Regarding to you said, The current limit issue may be related to the confusion between two device. Have you encountered similar experience? Is it possible that it is related to the previous FB Pin?

BR,

Jimmy

Hey Jimmy,

I've attached the original schematic file. RSP_M, RSN_M, RSP_S, and RSN_S are terminated C60 (MASTER) and C68 (SLAVE). They are the sense points for device output voltage regulation. R14 and R17 are connections to test points. RSHARE resistor should only be used to increase stability margin. I believe your current limit issue is stemming from somewhere else. Can you share the customer schematic?

PWR746B(001)_Sch.PDF

Thanks,
Caleb

Hi Caleb,

Sure. I sent the schematic to you by mail.

BR,

Jimmy