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Consider a supply for 3.3 V (V1) and 24 V (V2), 96 W each.

I'd expect synchronous rectification with V1, and post regulation with V2.

To decrease the Volt-seconds for an inductor, it seems conventional to "reduce the on-time".
Is it possible to have V2 the one with feedback, and post-regulate V1 via increasing the voltage drop in the MOSFETs used as diodes?
Would it be useful when the voltages are as disparate as 24&3.3? I can see why just shortening on-time looks good with voltages close, the shortened-on-time close to the primary one.

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  • \$\begingroup\$ Has it been done commercially? \$\endgroup\$ Commented Jan 2, 2023 at 6:56
  • \$\begingroup\$ Yes, if the 96-W output is obtained by rectifying a pulsing waveform, like the output of a forward or buck converter, then you can with leading-edge modulation implement a post-regulated synchronous rectifier. There was the NCP4331 long ago and there are probably newer ICs out there. I did document a solution in my book on SMPS (p873) after discussing mag-amps post regulators. \$\endgroup\$ Commented Jan 2, 2023 at 8:24
  • \$\begingroup\$ (I remember magnetic post regulators. I feel old.) (2nd. ed. looks promising.) \$\endgroup\$ Commented Jan 2, 2023 at 8:26
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    \$\begingroup\$ NCP4331 or analog's LT3710. Same as magnetic post regulation, I didn't want to mention it in the question. \$\endgroup\$ Commented Jan 2, 2023 at 8:34
  • \$\begingroup\$ (Down-voters please comment.) \$\endgroup\$ Commented Jan 8, 2023 at 12:15

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