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MC33063

eli
Guru 13485 points
Other Parts Discussed in Thread: MC33063A

We want to use MC33063A  as Voltage-Inverting Converter.From datasheet is not clear the maximum of output negative voltage. Can we get Vout= -36v ? And what is a max output current for this voltage?

 

  • 0
    TI__Guru**** 165146 points

    Eli,

    When used in the inverting configuration the ground lead of the MC33063A connects to Vout. 
    VIN - VOUT must be less than 40V. That only allows VIN to be 4V. Converting less than 4V to -36V will not work well on this device.
    The peak current must be less than 1.5A and this will indirectly limit the output current.

    Regards,
    Ron Michallick

  • 0 in reply to Ron Michallick
    Guru 13485 points

    Thanks.

    why for inverting configuration Vin is limited to 6v?

  • 0 in reply to eli
    TI__Guru**** 165146 points

    Eli,

    In figure 10 of data sheet, CT is 1500pF which is about 25uS using Ton chart (in figure 1).
    The current increase in the inductor is V*T/L, V=6V-1.5V, T=25uS, L=88uH. So delta inductor current is 1.28A

    The application could run with higher VIN if the Ton time was reduced or the inductor value was increased.

    Regards,
    Ron Michallick