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LMR51430: Schematic Review

Manjula S
Prodigy 20 points
Part Number: LMR51430

Tool/software:

Screenshot (1).pdf

Hey team,

I've to 2 doubts that I need clarity on: 

1). If I remove the Input Inductor and filtering capacitor leaving only a 4.7uF(C4) and 100uF(C3) polarized capacitor for a 1A load, and reduce the output capacitor too, will I have a steady state output?

2). I need to use 4 of the LMR51430XDDCR ICs for 2 +12V conversion, single +5V conversion and single +15V conversion, will a single input filtering circuit be sufficient for a total load of 2Amps? 

(Additional: Can I design it a 2-layer board with necessary stitch vias?)

Thanks in advance.

  • +1
    TI__Mastermind 24115 points

    Hi,

    1) Your input capacitors should be ok. Filtering on input is usually used to meet application requirements for conducted emi measurements, so you will need to evaluate your application requirements and what is necessary for your design. In regards to the output capacitance, please check the equations in section 9.2.2.5 of the datasheet to ensure that your new output capacitance will meet the requirement of your specs.

    2) Can you please share a diagram of how these device will be connected together? Are they sharing the input rail, or are they daisy chained together? The optimal input filter for each application will be dependent on the components and specs of that application. Please take a look at this application note to get a better sense as how to design input filters for different applications. 

    3) We generally recommend 4-layer boards to provide adequate space for routing, EMI shielding, and heat dissipation. You can try, but I would be worried about heat and EMI mainly. 

    Thank you,

    Joshua Austria