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MC33063A-Q1: boost: when the input voltage is higher than the output

Mahendra Patel1
Expert 3560 points
Part Number: MC33063A-Q1

Hello Team,

One of my customer want to understand behavior of MC33063A-Q1, when input voltage is greater than set output voltage in boost mode.

will it work in bypass mode?

is there any issue while operating in this region?

Regards,

Mahendra

  • 0
    TI__Guru 68355 points

    Hi Mahendra,

    For a boost circuit, when the input is greater than the output set point by at least a diode drop, the PWM will stop and the input voltage will pass through the rectifier diode and raise the output voltage up:  Vout = Vin - VF - Io x Rs, where Rs is the internal impedance along the current path from the input to the output. As long as the input voltage is less the IC's rating voltage, there should be no issue while operating in this region.

    Thanks,

    Youhao Xi, Applications Engineering.

  • 0 in reply to Youhao Xi
    TI__Expert 3560 points

    Thank you Youhao!

    This is helpful.