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LM25122-Q1: About maximum output power

Yoo YoungKoo
Prodigy 150 points
Part Number: LM25122-Q1
Other Parts Discussed in Thread: LM5170, LM5122

Hello

My customer has found a Boost type DC DC Controller capable of outputting 12V battery voltage input, output voltage 24V, Max output current 20A or more.

So I recommended the LM25122-Q1.

I have a few questions regarding the Maximum output specification for this product.

1. Is it possible to output 24V, 20A to the IC above?
2. Do you need special configuration (such as interleaving) for the above output?
3. Or is there a more suitable product than the LM25122-Q1?
Please help me.
Thank  you
Best regards.
  • 0
    TI__Guru 68495 points
    1. You should consider 4 phases of the LM25122. Otherwise the current sense signal will be too small for light load in a single or dual phase circuit, leading to noise immunity issues. The LM25122 can be configured in master/slave mode for four phases daisy chain.
    2. 4 phase interleaving, as mentioned above in master/slave mode. Please see datasheet for details.
    3. You may also consider the LM5170, which is a dual phase but you can just use 1st channel for all your load, and leave the 2nd channel diabled, if you what to use one phase. Using dual phase of the LM5170 in boost can allow you to select smaller inductors and distribute the heat,
  • 0 in reply to Youhao Xi
    Prodigy 150 points

    Hello

    Thank you for your help.

    Is there a reference schematic for the 4-phase configuration you described?

    If possible, please help me.

    Best regards

  • 0 in reply to Yoo YoungKoo
    TI__Guru 68495 points
    Please refer to the example at http://www.ti.com/tool/PMP7837

    This is for the LM5122 but the same circuit structure can be used for the LM25122-Q1.

    There is also an 700W peak power reference design with the LM25122-Q1. The link is at: www.ti.com/.../PMP11769

    Hope these help.