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Using motor driver in multiphase buck converter - continued

Michael Levin45
Prodigy 170 points
Other Parts Discussed in Thread: DRV8332

Hi John,

it's been a while that I first asked this question. Can you kindly answer it? Here's the link:

https://e2e.ti.com/support/power_management/non-isolated_dcdc/f/196/t/532987

I consider the DRV8332 chip as an option since it has 3 half-bridges controlled by logic levels.

This is the most important feature for me, more important than feedback and reference circuitry found in specialized DC-DC converter chips.

My question was: "is there anything wrong with the idea of using DRV8332 in 3-phase buck converter".

Thanks in advance,

Michael

  • 0
    TI__Guru**** 191445 points
    Unfortunately I do not support DRV8332 directly and have no experience with it at all. If I understand correctly, what you require is a buck converter with 50 V input, variable output voltage and 5 A output current, correct?
  • 0 in reply to JohnTucker
    Prodigy 170 points
    Correct. Sorry for misunderstanding, but my question was in fact very general, not about DRV8332 specifically.
    I can re-formulate the question as follows:

    TI manufactures, among many other things, DC-DC converter chips and motor driver chips.
    What is the main difference between the two (except for on-chip reference and error amplifier, etc.)?

    Stated differently, a buck converter chip often includes a couple of FETs configured as half-bridge, with all control circuitry.
    On the other hand, motor drivers usually include the same components.
    Why, then, typical applications of motor drivers listed in their datasheets do not include buck converters?
    Only because this would require additional control circuitry?
    Or because the power stage designed for a motor driver is unsuitable for a buck converter?

    I understand that your specialization is DC-DC converters, but maybe you know the answer.

    Thanks in advance,
    Michael