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LM5034: LM5034MTCX switching frequency calculation question

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Part Number: LM5034

Hi Support 

I would like to ask about the calculation method of switching frequency and resistance of LM5034MTCX. The calculation method is noted in the specification as follows:

When I bring in 200KHz according to the calculation method, the resistance value is 85.7KΩ,
But the specification note is as follows:

Only 42.2KΩ is required, and the switching frequency is 200KHz,
Is it convenient for guidance?

  • HI,

    Your calculation and the datasheet are both correct. Your calculation is for oscillator 200kHz, so OUT1 or OUT2 each will be on 100kHz. The datasheet you cited is measured at OUT1 or OUT2 at 200kHz, so the oscillator is 400kHz. 

    You can also use Fig 11 as your reference. 

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