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TIDA-050045: DNP part explanation

Chris Soelberg
Prodigy 70 points

Part Number: TIDA-050045
Other Parts Discussed in Thread: TPS23730EVM-093, TPS23730

Is there any additional data on the usage of the DNP parts that are part of the TIDA-050045 reference design?  Would like an explanation of when the DNP parts should be considered to be used/populated in the design.  Also should D18 also be listed as a DNP?

  • 0
    TI__Mastermind 21320 points

    Hello, 

    The TIDA-050045 board uses the same layout as the TPS23730EVM-093. The difference between the two is a BOM change. 

    Yes D18 can be DNP. 

    Different parts have different rules for why they would be DNP or not: 

    - D9 & D12 are different FET footprints in case a customer wanted to evaluate a different type of FET

    - C46 provides filtering on CS if needed

    - D24 provides additional surge protection if needed

    - R56, R57, & R58 represent pull up resistors if sending the TPH, TPL and BT signals to an MCU vs the LED indicators we have

    - Q5, R29, R32, D18 and C26 are a gate drive clamp circuit needed in the 12v version TPS23730EVM-093. ACF's need better gate driver circuits at higher output voltages

    - D19, C3 & R35 are a clamp circuit for Q8. Also usually required for higher output voltages 

    - D21 & D11 --- these are additional clamps we placed on the board for protection. The TPS23730 has soft-stop, and in order to test it we had to disable soft-stop, which required additional FET protection. 

    - C30 is an additional large output capacitor, also only used for EVM development testing. But if you wanted to populate it for increased capacitance we left the board space. 

    - C18 is a common mode cap for EMI and surge

    - L5 & L2 are common mode chokes for EMI filtering

    - D7, D8, D9 & D10 help for a rectifier bridge if you wanted to evaluate a full diode bridge instead of the hybrid we have with the FETs and diodes. 

    If this post answers your question, please indicate so by marking this thread as resolved. Thank you.

     

    Regards, 

     

    Michael P.

    Applications Engineer

    Texas Instruments 

  • 0 in reply to Michael Pahl
    Prodigy 70 points

    Thanks Michael.  Your explanation was just what I was looking to receive.  Just for clarity, there were a couple of typo's that I thought I would clear up.

    • D9 & D12 are different FET footprints -> Q9 & Q12 are different FET footprints
    • D19, C3 & R35 are a clamp circuit for Q8 -> D19, C37 & R35 are a clamp circuit for Q8

    Thanks!