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TPS23753A: || RE CE EMC TESTING SUPPORT || BSMA_ACMH

Hemal Patel
Intellectual 345 points
Part Number: TPS23753A

Tool/software:

We have also completed the first level of RE CE testing of this AM6254 based EVT Board [ACM Device]. We got the negative result of these RE and CE tests. And as per report analysis we suspect that below parts can be the reason for this test failure.
 
RE & CE Test Failure,
Below component can be the reason for CE failure.
1. PD Controller 
MPN:- TPS23753APW
Mfr:- Texas Instrument
Sch Ref des:- U1
Test setup:-
1. CE Test Results
--> LAN1 & LAN2 CE Test POE SUPPLY MOE
Test Standard Test Mode Result Remarks
LAN1 [POE SUPPLY]
Limit: CLASS- B
Frequency: 150 KHz to 30 MHz
--> POE SUPPLY Mode
Interface:- LAN1, LAN2, USB, eMMC, RTC, Temp, IR
 FAIL LAN1_CE_POE_SUPPLY_WITH_COMN-14092024
LAN2 [POE SUPPLY] FAIL LAN2_CE_POE_SUPPLY_WITH_COMN-14092024

2. RE Test Results
-->RE Test POE SUPPLY MOE
Test Standard Test Mode Result Remarks
RE [POE SUPPLY]
 Limit: CLASS- B
Frequency: 30mhz To 1ghz
--> POE SUPPLY Mode
Interface:- LAN1, LAN2, USB, eMMC, RTC, Temp, IR
 FAIL RE_POE SUPPLY RE-30 TO 1ghz -14.09.2024
Limit: CLASS- B
Frequency: 1ghz to 6ghz		 PASS RE_POE SUPPLY_RE-1 TO 6ghz -14.09.2024

We have attached the RE & CE report and schematic design of our ACM Boards so please check and share your suggestions like what changes we should make for these components to pass this RE & CE test.
 
Please let us know if any other details or data is required.
  • 0
    Intellectual 345 points

    Hello TI Expert,

    we are currently stuck at this point so help to provide resolution ASAP.

  • 0 in reply to Hemal Patel
    TI__Mastermind 37121 points

    Hi Hemal,

    Thanks for reaching out! Please see the comments below may related to transient response and EMI.

    1. Please try to mount more decoupling capacitors on the primary side.



    2. Please try to mount more Y-cap between primary GND and secondary GND.



    3. Is the primary SW FET AM3400N? It is recommended to use a FET with lower on-resistance (100 – 250mOhm) for 13W application. With high on-resistance FET, you could further increase gate resistance to 50 -100 Ohm.

    Best regards,

    Diang

  • 0 in reply to Diang Xing
    Intellectual 345 points

    Hiii Diang,

    Thanks for your suggestion let us check that.

    Can you please check the POE RJ45 connector and rectifier section, this section also can be impact the CE failure? Please review and Provide suggestion for this section like what changes we can make in this section?

  • 0 in reply to Hemal Patel
    TI__Mastermind 37121 points

    Hi Hemal,

    Thanks for your reply! The RJ45 port is with magnet and Bob-smith termination integrated. The common mode choke (J2 integrated and FL2) will make difference with CE test. You can increase the impedance of FL2 for better CM results with a cost of larger size normally. 

    I would recommend you to address the comments about FET and caps first which has more selections than common mode choke.

    Best regards,

    Diang