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PMP7256. BOM list. Inductance L1 (500nH or 700nH)

Yauheni Pauliukovich
Intellectual 340 points

My customer designs a power scheme for C6657. They prefer to use PMP7256.

1) There is the L1 = 500nH in a Schematic. Ther is the L1 = 700nH in the BOM. Where is a mistake?

2) This inductance (L1) has a too high profile. Is it possible to change L1 on another inductance with an approximately the same value but a higher DCR (MLC1265-701ML (DCR=1.24mOhm for L=700nH) and IHLP-2525CZ-01 (DCR=5mOhm for L=680nH) ?

Schematic

snvr131. Schematic.pdf

BOM

From BOM. mlc-270743.pdf

L1 from BOM

5127.From BOM. mlc-270743.pdf

L1 is low profile

Vishay_Inductor_IHLP-2525CZ-01.pdf

  • 0
    TI__Guru**** 191445 points

    I have contacted the designer to see whether they used 500 nH or 700 nH in the actual circuit.  For 12 V input, 1 V output @15 A, I calculate a minimum inductor value of 407 nH, so I think 500 nH or 700 nH is acceptable.  It all depends on how much ripple current you can tolerate.  If you change the inductor value or any of the output capacitors, you will need to re-calculate the compensation

  • 0 in reply to JohnTucker
    TI__Guru**** 191445 points

    700 NH was used.  If you use a higher DCR inductor, make sure it is rated for you maximum current.  Also efficiency will be slightly worse.