I have come across this article: https://www.powerelectronics.com/power-management/step-down-dc-dc-converter-eliminates-ferrite-cores-50khz-enabling-power-supply-chip

That describes the Cuk DC/DC converter using new GaN FETs as the best in class efficiency with tiny inductors.

  • Has anyone done this in simulation?
  • What controller can be used for regulating this topology?
  • \$\begingroup\$ If someone's built a controller before, then yeah, that someone has done it in simulation. \$\endgroup\$ – Marcus Müller Jan 14 at 14:48
  • \$\begingroup\$ I'm trying to simulate this in LTspice, but it's slow-going. The oscillations make for a very slow simulation. Controller is an issue also; dead-time and cross-conduction are critical. \$\endgroup\$ – rdtsc Jan 19 at 17:13

LTSPICE works just fine for simulating the normal Cuk topology, I can't see any reason why it wouldn't work here. Just make sure you model the parasitics appropriately, the same as for any SPICE simulation.

I've personally used the LM5022 (with normal FETs) for standard Cuk, I can't see any obvious reason why it would not work on this topology either. The main switches just need a complementary waveform, so a simple inverter should suffice, and the synchronous rectifier pair will be simple too.

There are some nice single-chip high/low side drivers like the IR25604 which might help too.


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