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BQ25758A: What is the maximum duty at the Buck-only operation?

Randy Chen
Intellectual 1960 points
Part Number: BQ25758A

Tool/software:

Hi, 

What is the maximum duty at the Buck-only operation?

Best regards,

Randy

  • 0
    TI__Mastermind 24070 points

    Hello Randy,

    Thanks for being patient with this. I will get back to you before the end of the week if that works for you.

    Best Regards,
    Ethan Galloway

  • 0 in reply to Ethan Galloway
    TI__Mastermind 24070 points

    Hello Randy,

    The max duty cycle will depend on the switching frequency. The low side has a minimum ON time of 150ns. So, for example, the max duty cycle should be 97% at 200kHz. At 600kHz, the max duty cycle should be 91%.

    If you need VAC=VOUT, you turn on bypass mode by setting EN_BYPASS=1. Bypass mode keeps the high side FETs always ON to pass current directly from VAC to VOUT.

    Best Regards,
    Ethan Galloway