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What feature of an IC sets it apart for a particular topology

Parameshwara Bhat
Intellectual 290 points

This is a general question about DC-DC Regulators / pwm controllers.

There are ceratain topologies listed against every IC. What feature of an IC sets it apart for some topologies and not for others.

Can one or a set of features be pciked up from datasheet based on which a user can rightly guess whether that particular IC can be used for a topology in mind ? 

OR we need to decide from the web-listing only ?

Very few datasheet provide a list of all supported topologies.

Best Regards.

  • 0
    TI__Intellectual 2770 points

    Hello Bhat,

    in general you got two types of topologies:
    1) a converter that transfers energy to the output as the switch is closed, basically forward topologies
    2) a converter that transfers energy to the output as the switch is open, basically flyback topologies

    So you got two control methods, two controller groups:
    1) non isolated buck and isolated forward topologies (single ended, push pull, halfbridge, fullbridge etc.)
    2) non isolated boost (supports SEPIC, Cuk, flyback as well)

    But there is the knowledge of the designer needed to decide for the right controller architecture;
    i.e. an inverting BuckBoost, a flyback topology, will be driven by a buck controller...

    Beside this we got a broad range of dedicated controllers for quasi resonant and resonant topologies,
    phase shifted topologies etc. etc.

    If you download TI Power Stage Designer ver.4 you could study most topologies and their waveforms.

    Welcome aboard of power electronics & best regards, Bernd

  • 0 in reply to Bernd Geck
    Intellectual 290 points

    Thank you,Geck.

    So, an intimate knowledge of topology and working of the controller required to decide what controller can do whic topolgy. Hope I am not mistaken.

    Warm Regards, Bhat