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LMS3655-Q1: LMS3655-Q1: light load issue

Steven He92
Expert 2125 points
Part Number: LMS3655-Q1

Dear Sir,

My customer would use LMS3655-Q1 to design a infotainment(10V~36Vin, Vo=4.2V/5A).

have a key spec: light load eff >80%during Vin=36V Io=4.2V/8mA

He have a confuse: he saw datasheet fig24 eff. curve basic can meet his spec(Eff >85% @Vin=36V/10mA), but EVM show eff. arround 70%); which is correct ??

Please you kindly provide solution if LMS3655-Q1 can't meet light-load spec..

Thanks!

Steven

  • 0
    TI__Mastermind 27045 points

    Hi Steven,

    Let me check it with product engineer and update you later.

    B R

    Andy

  • 0 in reply to Andy Chen
    TI__Mastermind 27045 points

    Hi Steven

    VIN(V) VOUT(V) IIN(A) IOUT(A) Efficiency
    36.009597 5.0971271 0.000249 0.001018 57.95825
    36.009558 5.0963879 0.000409 0.002023 70.09225
    36.009571 5.095692 0.000561 0.003024 76.31615
    36.009533 5.095452 0.000718 0.004025 79.36859
    36.009597 5.0947763 0.000882 0.005027 80.60715
    36.009584 5.0946913 0.001036 0.006025 82.28326

    We measure actual eff on EVM, the eff at 4mA is 79.36% which should meet customer's requirement.