Reducing size for PLC circuit

[Anonymous]

Dear All,

I’m developing a PLC system based on CY8CPLC10.

I bought a couple of evaluation boards to make them communicating and everything seems to be ok.

Now I’m designing my own board for my application, following the information that I found in the Zip file “CY3273 Board Design Files (Schematic, Layout, Gerber, BOM)” download from Cypress web site.

My application is slightly different from the standard one: I use PLC on battery cables with voltages that may vary from 15Vdc to 150Vdc depending on the type of battery is installed on (anyway I tested the application with the evaluation boards and it works).

Unfortunately I have not a lot of area where to put the circuits and I need to reduce the size of critical components as much as possible. So, finally, my questions are:

• Can I substitute the 1:1 transformer with a smaller one? In the Zip file you proposed for T1 the component “Precision Components 0505-0821G”. Could you propose a smaller one or tell me the minimum requirements for this component?
• Can I substitute C9 “Panasonic ECQ-U3A154MG” with a smaller one, considering that I don’t need to connect the application to a 230Vac line but to a 150Vdc line? Is it mandatory to use a polypropylene capacitor or can I use other technologies, like ceramic or polyester or other?

I look forward to your kind reply.

Alberto.

PS: I'm not sure I'm posting the question in the proper area, but I wasn't able to find a specifica area for PLC. In case, please let me know for future questions.

[SampathS_11]

Hello Alberto,

I think you are referring to " CY3274 (Designer, Programmer, Kit Design Files, Examples, Documentation).zip"

- You can make use of a smaller transformer for T1, as long as you make enough margin for the maximum bus voltage, which, in your case is 150V

- You can make use of a capacitor with a lower voltage rating, leaving enough margin to suit your system design and safety requirements

Thanks,

Sampath

[Anonymous]

Dear Sampath,

thank you for your reply.

In particular I’m referrig to “CY3272 Board Design Files (Schematic, Layout, Gerber, BOM)”, here enclosed.

I gently ask to give me more detail regaring the issues below:

- Regarding the transformer, should I mind some parameters like the primary inductance, V*usec product, max ESR?

- Regarding the capacitor, any technolgy is suitable for the application? Is the capacity value critical? Should I grant max ESR/ESL?

- Can I use, for example, Pulse PA0184NLT and Panasonic ECQ-E2154KF?

I look forward to your kind reply.

Best Regards,

Alberto.

Da: Sampath Selvaraj

Inviato: lunedì 9 luglio 2018 10:14

A: Alberto Ferrero <a.ferrero@atonstorage.com>

Oggetto: Re: - Reducing size for PLC circuit

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Reducing size for PLC circuit

reply from <https://community.cypress.com/people/samp?et=watches.email.thread> Sampath Selvaraj in PSoC 1 - <https://community.cypress.com/message/162129?et=watches.email.thread#162129> View the full discussion

[SampathS_11 · Accepted solution]

Hello Alberto,

I request you to kindly refer to AN55427 - Cypress Powerline Communication Board Design Analysis for component guidelines.

Section 2.3 would be relevant to your questions,

Thanks,

Sampath