cupoftea
Advanced Member level 6
Hi,
When you have a current mode converter and its unstable. You can often make it stable by reducing the feedback loop crossover frequency.
With a voltage mode converter, there is the power stage output LC filter, and its 2 poles to think of. As such, this rule of “reducing the crossover frequency in order to get stability”, doesn’t work any more.
Also, supposing, with a voltage mode converter, that you are crossing over at the output LC resonant frequency, and then you reduce feedback loop bandwidth from there……you will indeed be likely to get more stability, but your feedback loop will then be so sluggish that load/line transients may well present serious problems.
Would you agree?
When you have a current mode converter and its unstable. You can often make it stable by reducing the feedback loop crossover frequency.
With a voltage mode converter, there is the power stage output LC filter, and its 2 poles to think of. As such, this rule of “reducing the crossover frequency in order to get stability”, doesn’t work any more.
Also, supposing, with a voltage mode converter, that you are crossing over at the output LC resonant frequency, and then you reduce feedback loop bandwidth from there……you will indeed be likely to get more stability, but your feedback loop will then be so sluggish that load/line transients may well present serious problems.
Would you agree?