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LM5160-Q1: Application question in TIDA-01418

Lin Luke
Prodigy 20 points
Part Number: LM5160-Q1
Other Parts Discussed in Thread: TIDA-01418

HI,

In reference design  of TIDA-01418, about the LM5160QPWPRQ1, I have some question about it:

1. Why it use negative voltage -10.51V to generator 16.8V and 6.27V, but not used positive voltage?

2. about the transformer T100 (Wurth Elektronik 750315445) , it's turn ratio in (4-2):(7-8) is 1:1, why can it transformer -10.51V to 16.8V?

Thank you!

  • 0
    TI__Genius 13735 points

    hi, Luke，

    I will loop our expert  to look into your question .

    Elena

  • +1
    TI__Mastermind 26496 points

    Hi Luke

    1. By using positive voltage, Do you mean use FLybuck? 

     As the Vin is 12V battery, and we might have a lower Vinmin, let's say 9V. The D is recommended to <0.5 in Flybuck design for better regulation of the Vo_secondary.  Which means we might need to design with a Vo_pri <=4.5V.  The turns ratio is big and The output power capacity will be small because the Po_max can be estimated by :Vo_pri*Io_max. 

    2. The 16.8V(TP102) shares the same GND with the 6.27V(TP103).  The turns ratio should be (4-2): [(7-8)+(8-9)].

    Thank you